阅读说明：本技术 香叶醇、叶醇在果蔬贮藏保鲜中的应用及一种水果采后处理保鲜的方法 (Application of geraniol and leaf alcohol in storage and preservation of fruits and vegetables and method for postharvest treatment and preservation of fruits ) 是由 洪敏� 贺明阳 于 2021-09-01 设计创作，主要内容包括：本发明涉及果蔬贮藏、保鲜技术,公开了香叶醇、叶醇在果蔬贮藏保鲜中的新应用及一种水果采后处理保鲜的方法。本发明提供的一种水果果实采后处理延长贮藏期的方法,果实采摘后,采用香叶醇或者叶醇溶液对果实进行喷雾处理或者浸泡处理,然后晾干、贮藏果实。首次将香叶醇和叶醇作为保鲜剂应用于水果采后保鲜处理,在室温贮藏期间能够有效地延缓李果实硬度、可溶性固形物和可滴定酸含量的降低,对保持果实质地和糖、酸品质方面具有积极作用；香叶醇或叶醇抑制了果实软化、保持果实品质,延长果实货架期,且安全性高、无毒副作用。在缺乏低温的贮运销环境下缓解了李果实集中上市的销售压力。(The invention relates to a fruit and vegetable storage and fresh-keeping technology, and discloses a new application of geraniol and leaf alcohol in storage and fresh-keeping of fruits and vegetables and a method for postharvest treatment and fresh-keeping of fruits. The invention provides a method for prolonging the storage period of postharvest treatment of fruits, which comprises the steps of spraying or soaking the fruits by using geraniol or leaf alcohol solution after the fruits are picked, and then airing and storing the fruits. Geraniol and leaf alcohol are applied to the postharvest fresh-keeping treatment of fruits as the fresh-keeping agent for the first time, the reduction of hardness, soluble solid content and titratable acid content of the plum fruits can be effectively delayed in the period of room-temperature storage, and the fresh-keeping agent has positive effects on the aspects of fruit texture, sugar quality and acid quality; geraniol or leaf alcohol inhibits fruit softening, maintains fruit quality, prolongs fruit shelf life, and has high safety and no toxic or side effect. The pressure of selling the plum fruits on the market in a centralized way is relieved in the low-temperature storage, transportation and sale environment.)

1. The geraniol or the leaf alcohol is applied to the storage and the preservation of fruits and vegetables.

2. The use of claim 1, wherein: the application is the application of geraniol or leaf alcohol in the treatment, storage and fresh-keeping of fruit after picking.

3. Use according to claim 2, characterized in that: the fruit is plum.

4. Use according to claim 2, characterized in that: the application is to treat picked fruits by adopting geraniol or geraniol solution.

5. The use of claim 4, wherein: spraying or soaking picked fruits by adopting geraniol or leaf alcohol solution, wherein the concentration of the geraniol or leaf alcohol solution is 1000-2000 mu L/L;

preferably, the spraying treatment refers to spraying until the surface of the fruit is uniformly covered with a fog solution;

preferably, the soaking treatment is to adopt geraniol or leaf alcohol solution to carry out rapid soaking treatment on the picked fruits, namely the fruits are taken out immediately after being completely soaked in the geraniol or leaf alcohol solution;

preferably, the concentration of geraniol solution is 1000. mu.L/L, and the concentration of geraniol solution is 2000. mu.L/L.

6. A method for prolonging the storage period of postharvest treatment of fruits is characterized in that: after the fruits are picked, geraniol or a leaf alcohol solution is adopted to carry out spraying treatment or soaking treatment on the fruits, and then the fruits are aired and stored.

7. The method of claim 6, wherein: the fruits are plums, and the concentration of the geraniol or the leaf alcohol solution is 1000-2000 mu L/L; preferably, the concentration of geraniol solution is 1000. mu.L/L, and the concentration of geraniol solution is 2000. mu.L/L.

8. The method of claim 6 or 7, wherein: the fruit is sprayed by geraniol or a leaf alcohol solution, the spraying treatment is carried out by an online fruit and vegetable fresh-keeping spraying treatment system, the online fruit and vegetable fresh-keeping spraying treatment system comprises a mist generation device (1), a mist transmission pipeline (2) and a fruit and vegetable conveying belt (3), one end of the mist transmission pipeline (2) is fixedly connected with a mist outlet of the mist generation device (1), the other end of the mist transmission pipeline is connected with at least one mist output pipe (4), the mist output pipe (4) is provided with a plurality of mist outlets (41), the mist output pipe (4) is arranged above the fruit and vegetable conveying belt (3), and the mist outlets (41) are opposite to the fruit and vegetable conveying belt (3);

the mist generating device (1) comprises a shell (10), a liquid storage tank (11) is arranged in the shell (10), an ultrasonic atomizer (12), a heating pipe (13) and a temperature sensor (14) are arranged in the liquid storage tank (11), an atomizing power switch (15), an atomizing timing switch (16), a heating power switch (17) and a temperature controller (18) are arranged on the shell (10), the ultrasonic atomizer (12), the atomizing timing switch (16) and the atomizing power switch (15) are sequentially and electrically connected, the heating pipe (13) and the temperature sensor (14) are respectively and electrically connected with the temperature controller (18), and the temperature controller (18) is electrically connected with the heating power switch (17);

and (3) starting a system, putting the fruits to be processed on the fruit and vegetable conveyor belt (3) from the inlet end of the fruit and vegetable conveyor belt (3), spraying the fruits to be processed, then taking the fruits out of the outlet end of the fruit and vegetable conveyor belt (3) to enter a fruit collecting box, airing the fruits, and storing and transporting the fruits.

9. The method of claim 8, wherein: the fog output pipes (4) are connected in parallel with the fog transmission pipeline (2); the mist generating device (1) is also provided with a main power switch (19), and the atomizing power switch (15) and the heating power switch (17) are electrically connected with the main power switch (19);

at least one air inlet is formed in the shell (10), and a fan is arranged in the shell (10) and used for blowing the mist into the mist transmission pipeline (2).

10. The method of claim 8, wherein: the online fruit and vegetable fresh-keeping spray treatment system further comprises a liquid storage barrel (5), wherein the liquid storage barrel (5) is connected with a liquid storage box (11) in the shell (10) through a pipeline and used for supplementing treatment liquid into the liquid storage box (11); the shell (10) is provided with a groove for installing and placing the liquid storage barrel (5); a switch is arranged on a pipeline connecting the liquid storage barrel (5) and the liquid storage tank (11);

the on-line fruit and vegetable fresh-keeping spraying treatment system further comprises a fog recycling box, the fruit and vegetable conveying belt (3) is a hollow conveying belt, and the fog recycling box is arranged under the fruit and vegetable conveying belt (3) and used for recycling fog generated by fog condensation.

Technical Field

The invention belongs to the technical field of agriculture, relates to a fruit and vegetable storage and preservation technology, and particularly relates to application of geraniol and leaf alcohol in fruit and vegetable storage and preservation and a method for postharvest treatment and preservation of fruits.

Background

The plum (Rosaceae) plum (Prunus) has a long history of cultivation in China, and the planting area is spread over plains, hills and mountainous regions. The plum has thin and rich juice and rich nutrition, and is popular with consumers. Plum is a typical respiration jump type fruit, the harvesting period is concentrated in summer high-temperature and dry seasons, the physiological metabolism is vigorous, the fruit is easy to soften in the storage, transportation and sale processes, the quality is reduced, the market shelf life is short, and the market supply is seriously influenced. In recent years, the sales pressure has been doubled with a great increase in the yield of plums. When the deep processing technology of plums and processing enterprises are still insufficient, the research and development of the technology for preserving the picked plums are required to be accelerated, and the shelf life of the plums is prolonged as much as possible.

The postharvest treatment can effectively inhibit the occurrence of postharvest diseases of the plum fruits and keep the fruit quality. At present, the processing technology of the picked plum fruits comprises physical preservation (such as cold storage, air-conditioned storage and reduced-pressure storage) and chemical preservation (such as chemical synthetic preservatives, bactericides and the like). Although the chemical bactericide is convenient to use, resistant strains are easy to generate after long-term use, pesticide residues exceed the standard, and the ecological environment and the human health are influenced. The equipment required by the current physical fresh-keeping is difficult to popularize on a large scale. The previous researches show that the temperature is the first factor of fruit storage and preservation and is an important factor influencing the physiological metabolism, quality and storability of fruits. Refrigeration is the main method for storing the plum fruits at present, but the cold storage equipment of the plum at present is lacked and the cold chain logistics transportation system is imperfect. Therefore, the development and popularization of novel and safe preservation technology based on room temperature storage has certain marketization application value.

The plum fruit is an important economic fruit in China, and is quickly after-ripened and softened by the height regulation of ethylene in the post-harvest process. Such rapid ripening leads to a change in plum fruit quality index if the firmness, The Soluble Solids (TSS), the Titratable Acid (TA) content, etc. are reduced. The hardness is an important factor influencing the storage property of the plum fruits and is an intuitive index reflecting the fruit ripening and aging, and the reduction of the hardness can directly cause the reduction of the commodity value of the plum fruits, thereby causing huge economic loss.

The plum varieties in south and north China are different and have some characteristic varieties. The half-edge red plum is famous because the fruit looks purplish red towards the sun and green at the back, and the fruit has the characteristics of brittleness, fragrance, sweetness and brilliance. The Xianping plum is like peach in shape, tastes like plum, and is sweet, crisp and tasty. The brittleness of half-red plums and immortal plums is an important characteristic, and directly influences the taste and commodity value of the fruits. The fruits are gathered to be sold on the market, but at present, the fruits are directly transported to the market in the variety areas after being harvested, the preservation technology of the picked plums and physical preservation equipment such as refrigeration, cold chain and the like are lacked, the hardness of the plums is reduced quickly, the shelf life is short, and the commodity retention time is short.

Geraniol (Geraniol), also known as Geraniol, is an acyclic monoterpene alcohol compound, is one of the main components of essential oils such as rose oil, clove oil and citronella oil, and has antibacterial effect. Leaf alcohol (leaf alcohol) is also called as "Qingyehol" and "cis-3-hexene-l" alcohol, and has an anti-insect effect. Geraniol and leaf alcohol have the characteristics of high safety, no toxicity, no residue and the like, and are in the list of allowable synthetic flavors for food in the national standard of food additive use in GB 2760-2014 food safety.

At present, geraniol and leaf alcohol are widely applied to essence and spice, and the application of geraniol and leaf alcohol in plum fruit preservation is not reported.

Disclosure of Invention

The inventor of the invention discovers that the application of the geraniol or the leaf alcohol to the storage and preservation treatment of the fruits and the vegetables has good preservation effect and is non-toxic and harmless, and on the basis, the invention provides the new application of the geraniol and the leaf alcohol to the storage and preservation of the fruits and the vegetables and the method for the postharvest treatment and preservation of the fruits. The specific technical scheme of the invention is as follows:

the invention provides application of geraniol or leaf alcohol in storage and preservation of fruits and vegetables.

The application is the application of geraniol or leaf alcohol in the treatment, storage and fresh-keeping of fruit after picking.

The fruit is plum.

The application is to treat picked fruits by adopting geraniol or geraniol solution.

Preferably, geraniol or a leaf alcohol solution is adopted to carry out spraying treatment or soaking treatment on the picked fruits, and the concentration of the geraniol or the leaf alcohol solution is 1000-2000 muL/L;

preferably, the spraying treatment refers to spraying until the surface of the fruit is uniformly covered with a fog solution;

preferably, the soaking treatment is to adopt geraniol or leaf alcohol solution to carry out rapid soaking treatment on the picked fruits, namely the fruits are taken out immediately after being completely soaked in the geraniol or leaf alcohol solution;

preferably, the concentration of geraniol solution is 1000. mu.L/L, and the concentration of geraniol solution is 2000. mu.L/L.

The invention also provides a method for prolonging the storage period of the postharvest treatment of the fruits, which comprises the steps of spraying or soaking the fruits by using geraniol or leaf alcohol solution after the fruits are picked, and then airing and storing the fruits.

In the method, the fruit is plum, and the concentration of the geraniol or the leaf alcohol solution is 1000-2000 muL/L; preferably, the concentration of geraniol solution is 1000. mu.L/L, and the concentration of geraniol solution is 2000. mu.L/L.

In the method, geraniol or leaf alcohol solution is adopted to carry out spraying treatment on fruits, and the spraying treatment is carried out by adopting an on-line fruit and vegetable fresh-keeping spraying treatment system, wherein the on-line fruit and vegetable fresh-keeping spraying treatment system comprises a mist generation device, a mist transmission pipeline and a fruit and vegetable conveyor belt, one end of the mist transmission pipeline is fixedly connected with a mist outlet of the mist generation device, the other end of the mist transmission pipeline is connected with at least one mist output pipe, a plurality of mist outlets are arranged on the mist output pipe, the mist output pipe is arranged above the fruit and vegetable conveyor belt, and the mist outlets are opposite to the fruit and vegetable conveyor belt;

the mist generating device comprises a shell, a liquid storage tank is arranged in the shell, an ultrasonic atomizer, a heating pipe and a temperature sensor are arranged in the liquid storage tank, an atomizing power switch, an atomizing timing switch, a heating power switch and a temperature controller are arranged on the shell, the ultrasonic atomizer, the atomizing timing switch and the atomizing power switch are sequentially and electrically connected, the heating pipe and the temperature sensor are respectively and electrically connected with the temperature controller, and the temperature controller is electrically connected with the heating power switch;

and (3) starting a system, putting the fruits to be processed on the fruit and vegetable conveyor belt from the inlet end of the fruit and vegetable conveyor belt, spraying the fruits to be processed, then, taking the fruits out of the outlet end of the fruit and vegetable conveyor belt to enter the fruit collecting box, and airing the fruits to be stored and transported.

Preferably, the fog output pipes are connected with the fog transmission pipeline in parallel, so that the spraying on the fruits and vegetables is more uniform and the effective spraying amount of each fruit and vegetable can be ensured;

the fog generating device is also provided with a main power switch, and the atomizing power switch and the heating power switch are electrically connected with the main power switch, so that the device is safer to use;

the fruit and vegetable conveying belt is characterized in that at least one air inlet is formed in the shell, and a fan is arranged in the shell and used for blowing mist into the mist conveying pipeline to ensure that the generated mist is continuously conveyed to the fruit and vegetable conveying belt.

Preferably, the online fruit and vegetable fresh-keeping spray treatment system further comprises a liquid storage barrel, wherein the liquid storage barrel is connected with the liquid storage box in the shell through a pipeline and used for supplementing treatment liquid into the liquid storage box; a switch is arranged on a pipeline connecting the liquid storage barrel and the liquid storage tank; the treatment liquid can be conveniently supplemented at any time when the treatment liquid in the liquid storage tank is nearly used up, so that the time and the labor are saved, and the work is convenient;

the shell is provided with a groove for installing and placing the liquid storage barrel, so that the liquid storage barrel is not easy to fall off from the shell; a switch is arranged on a pipeline connecting the liquid storage barrel and the liquid storage tank;

on-line fruit vegetables spray treatment system that keeps fresh still includes the fog collection box, the fruit vegetables conveyer belt is the fretwork conveyer belt, the fog collection box sets up and is used for retrieving the fog that the fog condensation produced under the fruit vegetables conveyer belt, and the setting of fretwork conveyer belt face makes and is difficult for accumulating too much fog on the conveyer belt, and the hole drippage of fog on the conveyer belt is collected in the fog collection box is concentrated.

The invention has the beneficial effects that:

the geraniol and the leaf alcohol are applied to the postharvest fresh-keeping treatment of the fruits for the first time as the fresh-keeping agent, and experiments prove that the postharvest fresh-keeping effect of the plum fruits is good, the safety is high, no toxic or side effect exists, and the geraniol and the leaf alcohol can be widely applied as a novel and excellent fruit and vegetable storage and fresh-keeping treatment agent. The plum is treated by geraniol or leaf alcohol, so that the reduction of hardness, soluble solid and titratable acid content of the plum can be effectively delayed during the storage period at room temperature, and the plum has positive effects on the aspects of keeping fruit texture and sugar and acid quality; the treatment of geraniol or leaf alcohol inhibits fruit softening, maintains fruit quality, and prolongs fruit shelf life. The pressure of selling the plum fruits on the market in a centralized way is relieved in the low-temperature storage, transportation and sale environment.

The geraniol and the leaf alcohol are combined with the spray treatment of the online fruit and vegetable fresh-keeping atomization treatment system, so that the continuous batch treatment of the fruits can be realized, the liquid consumption can be reduced, the medicament cost can be saved, an automatic method which is low in cost and can realize the continuous batch treatment is provided for the fresh-keeping treatment of the picked fruits, and the shelf life of the fruits can be effectively prolonged.

Drawings

FIG. 1 is a schematic structural diagram of an on-line fruit and vegetable freshness-retaining spray treatment system in embodiment 1;

FIG. 2 is a schematic perspective view of an on-line fruit and vegetable fresh-keeping spray treatment system according to embodiment 1;

in the figure, 1 mist generating device, 10 shell, 11 liquid storage tank, 12 ultrasonic atomizer, 13 heating pipe, 14 temperature sensor, 15 atomizing power switch, 16 atomizing timing switch, 17 heating power switch, 18 temperature controller, 19 main power switch, 2 mist transmission pipeline, 3 fruit and vegetable conveying belt, 4 mist output pipe, 41 mist outlet and 5 liquid storage barrel.

FIG. 3 shows the results of changes in hardness of prune pulp after the atomization treatment.

FIG. 4 shows the results of the change in the soluble solid content of prune pulp after the atomization treatment.

FIG. 5 shows the results of the change in titratable acid content of prune pulp after the atomization treatment.

FIG. 6 shows the change of hardness of the pulp of Prunus Cerasifera Ehrlichia after atomization treatment.

FIG. 7 shows the variation of soluble solid content of the pulp of Prunus Cerasifera Ehrlichi after atomization treatment.

FIG. 8 shows the change of titratable acid content of the pulp of Prunus cerasifera after atomization treatment.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to be limiting.

The experimental procedures in the following examples are conventional unless otherwise specified.

Embodiment 1 on-line fruit and vegetable fresh-keeping spray treatment system

An on-line fruit and vegetable fresh-keeping spray treatment system as shown in fig. 1 and 2 mainly comprises a mist generating device 1, a mist transmission pipeline 2 and a fruit and vegetable conveying belt 3. One end of the mist transmission pipeline 2 is fixedly connected with the mist outlet of the mist generating device 1, the other end of the mist transmission pipeline is connected with at least one mist output pipe 4, a plurality of mist outlets 41 are arranged on the mist output pipe 4, the mist output pipe 4 is arranged above the fruit and vegetable conveying belt 3, and the mist outlets 41 are opposite to the fruit and vegetable conveying belt 3.

In some technical schemes, a plurality of mist output pipes 4 are connected in parallel with the mist transmission pipeline 2.

In some embodiments, the mist generating device 1 is an ultrasonic atomization device.

In some technical solutions, the mist generating device 1 includes a housing 10, a liquid storage tank 11 is provided in the housing 10, an ultrasonic atomizer 12, a heating pipe 13, and a temperature sensor 14 are provided in the liquid storage tank 11, an atomizing power switch 15, an atomizing timing switch 16, a heating power switch 17, and a temperature controller 18 are provided on the housing 10, the ultrasonic atomizer 12, the atomizing timing switch 16, and the atomizing power switch 15 are sequentially electrically connected, the heating pipe 13 and the temperature sensor 14 are respectively electrically connected with the temperature controller 18, and the temperature controller 18 is electrically connected with the heating power switch 17.

In some technical solutions, the mist generating device 1 is further provided with a main power switch 19, and the atomizing power switch 15 and the heating power switch 17 are both electrically connected to the main power switch 19.

In some technical schemes, the online fruit and vegetable fresh-keeping spray treatment system further comprises a liquid storage barrel 5, wherein the liquid storage barrel 5 is connected with a liquid storage tank 11 in the shell 10 through a pipeline and is used for supplementing treatment liquid into the liquid storage tank 11; a switch is arranged on the pipeline connecting the liquid storage barrel 5 and the liquid storage tank 11.

In some embodiments, at least one air inlet is disposed on the housing 10, and a fan is disposed in the housing 10 for blowing the mist into the mist transportation pipe 2.

In some technical solutions, a groove is provided on the housing 10 for installing and placing the liquid storage barrel 5.

In some technical schemes, online fruit and vegetable fresh-keeping spraying processing system still includes fog recovery box, and fruit and vegetable conveyer belt 3 is the fretwork conveyer belt, and fog recovery box sets up and is used for retrieving the fog that the fog condensation produced under fruit and vegetable conveyer belt 3.

When using this system, pack into liquid storage bucket 5 with the treatment fluid, open the switch on the pipeline of connecting liquid storage bucket 5 and liquid storage tank 11, the treatment fluid gets into in the liquid storage tank 11, open the switch on fog production device 1, set up heating temperature (then do not open the heating to the fruit that does not need heat treatment) and atomizing time, after producing even spraying, open fruit vegetables conveyer belt 3, import fruit vegetables at the one end of fruit vegetables conveyer belt 3, let fruit vegetables evenly distribute and move on fruit vegetables conveyer belt 3, receive spray treatment in the position that fog export 41 faces to, collect the fruit vegetables after spray treatment at the other end of fruit vegetables conveyer belt 3 and air-dry, carry out commercialization processing such as grading, packing, storage or transportation.

Example 2 half-edge fresh-keeping treatment experiment of picked red plums

1 materials and reagents

1.1 materials and treatments

Materials: and half of red plum.

The fruit of Prunus Semipinnata was harvested in 2021, 6 months and 16 days in Wusheng county, Sichuan province. The fruits are transported to orange research institute of southwest university on the day after picking, and are selected to have uniform size, consistent maturity and no plant diseases, insect pests and mechanical damage. The screened fruits were randomly divided into 7 groups. The control group was treated by atomization with clear water. Atomizing the rest 6 groups with 2000, 1000, 500 μ L/L geraniol and 2000, 1000, 500 μ L/L geraniol respectively by using online fruit and vegetable fresh-keeping atomization treatment system (without heating), wherein the treatment time is 1 min. Starting the online fruit and vegetable preservation atomization treatment system in the embodiment 1, placing fruits to be treated on a fruit and vegetable conveyor belt from the inlet end of the fruit and vegetable conveyor belt, carrying out atomization treatment on the fruits and the vegetables in the moving process of the fruits and the vegetables on the fruit and vegetable conveyor belt, carrying out atomization for 1min totally, then enabling the fruits to come out of the outlet end of the fruit and vegetable conveyor belt to enter a fruit collection box, airing the fruits, storing the dried fruits at room temperature (25 ℃), sampling when the fruits are stored for 0, 4 and 7 days, and respectively measuring the hardness, the soluble solid content and the titratable acid content of the fruits.

1.2 Experimental reagents and apparatus

Geraniol (CAS number: 106-24-1) and geraniol (CAS number: 928-96-1) both had a purity of 98% and were purchased from Chongqing transition chemical Co., Ltd.

The online fruit and vegetable fresh-keeping atomization treatment system is self-made equipment in a laboratory, and the specific structure of the online fruit and vegetable fresh-keeping atomization treatment system is as described in embodiment 1.

GY-4 fruit hardness tester, Guantai precision instruments, Inc. of Dongguan.

Pocket Brix-Acidity Meter Master kit, Japan love Tuo corporation.

2 measurement index and method

2.1 measurement of pulp firmness

Randomly selecting 20 fruits, selecting 3 positions of the equator of the fruits at equal intervals, peeling, and measuring the hardness of the pulp by a GY-4 hardness tester, wherein the unit is as follows: and N is added.

2.2 measurement of soluble solid content (TSS) and Titratable Acid (TA) content in pulp

The fruit is peeled off, crushed by a grinder and filtered by gauze, and the content of soluble solids in the fruit juice is directly measured by a Pocket Brix-Acidity Meter Master kit refractometer in unit: % of the total weight of the composition. 1g of the juice was weighed, diluted 50-fold with distilled water, and the titratable acid content of the juice was determined using a Pocket Brix-Acidity Meter Master kit hand-held refractometer, unit: % of the total weight of the composition.

2.3 data processing

The obtained data were statistically processed using Microsoft Excel 2007, subjected to significance analysis using the Duncan method using SPSS (v.20) software (P <0.05), and plotted using Origin 9 (the different lower case letters marked in the figure indicate that the difference at the level of P <0.05 is statistically significant).

3 results

3.1 Effect of on-line atomization treatment on the hardness of the pulp of Prunus humilis Bunge

Hardness is the most important index for measuring the texture of prunus fruits, and directly influences the mouthfeel and the commodity value of the fruits. As shown in FIG. 3, the half-size red plum flesh was significantly decreased in hardness throughout the storage period. When the culture medium is stored for 4d, the pulp hardness after the geraniol treatment of 1000 muL/L is obviously lower than that of a control group, and other treatments have no obvious difference from the control group. Storage to 7d, 2000, 1000. mu.L/L geraniol and 2000. mu.L/L geraniol treatments resulted in significantly higher meat hardness than the control, with other treatments significantly lower than the control. In the whole storage period, the pulp hardness of the control group is reduced from 8.87N to 5.18N, and the reduction rate is 41.6%; the pulp hardness after 2000 mu L/L, 1000 mu L/L geraniol and 2000 mu L/L leaf alcohol treatment is respectively reduced from 8.87N to 5.41, 7.07 and 6.31N, and the reduction rates are respectively 39.0%, 20.3% and 28.8%. The result shows that 1000 muL/L geraniol and 2000 muL/L geraniol can maintain higher hardness of plum pulp through online atomization treatment, and softening of the picked fruits is delayed.

3.2 influence of on-line atomization on TSS content of pulp of Prunus humilis Bunge

Soluble Solids (TSS) and Titratable Acid (TA) are among the important indicators for measuring fruit flavor and quality. As shown in FIG. 4, the TSS content of the pulp in the control, 1000. mu.L/L geraniol and 2000. mu.L/L geraniol-treated groups decreased overall during the storage period. When the pulp is stored to 4d and 7d, the TSS content of the pulp in the 1000 mu L/L geraniol and 2000 mu L/L phytol treated groups is significantly higher than that in the control group. The result shows that the online atomization treatment of 1000 muL/L geraniol and 2000 muL/L geraniol delays the reduction of the TSS content of the plum pulp while maintaining higher hardness of the plum pulp, and keeps higher sweetness of the fruit.

3.3 influence of Online atomization on TA content of pulp of Prunus humilis Bunge

As shown in FIG. 5, the TA content of the half red plum flesh generally decreased continuously throughout the storage period. When the samples are stored for 4 days, the TA content after the treatment of the geraniol of 1000 muL/L is obviously higher than that of a control group. When the samples are stored for 7d, the TA content of pulp in the 1000 mu L/L geraniol and 2000 mu L/L leaf alcohol treated groups is significantly higher than that in the control group. The result shows that the online atomization treatment of 1000 muL/L geraniol and 2000 muL/L geraniol delays the reduction of TA content of plum pulp and keeps higher acidity of fruits.

4 conclusion

The online atomization treatment of geraniol and geraniol delays the reduction of TSS and TA contents of plum pulp while maintaining higher hardness of the plum pulp, and keeps better texture of fruits and the quality of sugar and acid.

Example 3 experiment of postharvest preservation treatment of Prunus cerasifera

1 materials and reagents

1.1 materials and treatments

Materials: xian peach plum

The fruits of the peaches and plums are picked in the sandlawn dam area of Chongqing city in 2021, 7 months and 13 days. The fruits are transported to orange research institute of southwest university on the day after picking, and are selected to have uniform size, consistent maturity and no plant diseases, insect pests and mechanical damage. The screened fruits were randomly divided into 3 groups. The control group was treated by atomization with clear water. Based on the research result of the early-stage half-red plum, 1000 muL/L geraniol and 2000 muL/L geraniol are selected for the research treatment group to respectively carry out atomization treatment on the Xianli plum, and the treatment time is 1 min. After air drying, the fruits are stored at room temperature (25 ℃), and samples are taken for 0, 2, 4 and 6 days of storage, and the hardness, the soluble solid content and the titratable acid content of the fruits are respectively measured.

1.2 Experimental reagents and apparatus

The same as in example 2.

2 measurement index and method

2.1 measurement of pulp firmness

The same as in example 2.

2.2 measurement of soluble solid content (TSS) and Titratable Acid (TA) content in pulp

The same as in example 2.

2.3 data processing

The same as in example 2.

3 results

3.1 influence of on-line atomization treatment on hardness of peach plum pulp

Hardness is an important factor influencing the storage property of the plum fruits and is an intuitive index reflecting the fruit ripening and aging. As can be seen from FIG. 6, the hardness of the flesh of the peaches was significantly reduced with the increase of the storage time. When the test sample is stored for 2d, the change of the pulp hardness of the treated group is not obviously different from that of the control group. Storage to 4d and 6d, 1000. mu.L/L geraniol and 2000. mu.L/L geraniol treatment resulted in significantly higher meat hardness than the control. In the whole storage period, the pulp hardness of the control group is reduced from 11.55N to 6.88N, and the reduction rate is 40.4%; the pulp hardness after the treatment of 1000 muL/L geraniol and 2000 muL/L geraniol is respectively reduced from 11.55N to 7.61N and 8.21N, and the reduction rates are respectively 34.1% and 28.9%. The result shows that 1000 muL/L geraniol and 2000 muL/L geraniol online atomization treatment can delay the reduction of hardness of plum pulp and inhibit the softening of the plum pulp.

3.2 influence of Online atomization treatment on TSS content of peach plum pulp

As can be seen from FIG. 7, the TSS content of the pulp in the control group increased first and then decreased during storage at room temperature. The TSS content of pulp in 1000. mu.L/L geraniol and 2000. mu.L/L leaf alcohol-treated groups was significantly higher than that in the control group throughout the storage period, and there was a significant difference after 2 days of storage. The results show that the online atomization treatment of 1000 muL/L geraniol and 2000 muL/L geraniol delays the reduction of TSS content of plum pulp and maintains the fruit quality.

3.3 influence of Online atomization treatment on TA content of peach plum pulp

The content of titratable acid is one of the important factors reflecting the quality of the fruit. The content of titratable acid in the fruit directly influences the quality of the fruit, and the organic substances in the fruit body are consumed and decomposed in cells to cause the titratable acid content to be reduced along with the prolonging of the preservation time. As shown in FIG. 8, the TA content of the pulp in the control group continuously decreased with the increase of the storage time, while the TA content decreased by the atomization treatment of 1000. mu.L/L geraniol and 2000. mu.L/L geraniol, and the fruit quality was maintained.

4 conclusion

The online atomization treatment of the geraniol and the leaf alcohol can delay the reduction of the hardness, the soluble solid content and the titratable acid content of the plum fruits, has positive effects on the aspects of keeping the fruit texture and the sugar and acid quality, effectively inhibits or delays the ripening and aging process of the plum fruits, prolongs the shelf life of the fruits, relieves the sales pressure of the plum fruits on the market in a centralized manner, and helps to increase the agricultural income.