阅读说明：本技术 稻谷的应急防霉处理方法 (Emergency mildew-proof treatment method for paddy ) 是由 王青云 张凯歌 余璐 林亲录 周文化 于 2021-07-29 设计创作，主要内容包括：本发明公开了一种稻谷的应急防霉方法,其特征在于包括如下步骤：以异辛醇单独使用作为防霉剂,即将异辛醇添加至稻谷中,翻动稻谷,混匀后堆放或装袋存放；或者是,以异辛醇与异丁酸配合使用作为防霉剂,即将异辛醇与异丁酸添加至稻谷中,翻动稻谷,混匀后堆放或装袋存放。本发明可较好解决刚采收的稻谷或储藏过程中因雨淋湿等导致稻谷水分含量升高,但是烘干机械烘干能力有限不能及时烘干,或者由于阴雨天气无法及时晾晒时而致使稻谷在短时间内出现霉变的问题。(The invention discloses an emergency mildew-proof method for rice, which is characterized by comprising the following steps: the isooctanol is independently used as the mildew preventive, namely the isooctanol is added into the paddy, the paddy is turned over, and the paddy is uniformly mixed and then stacked or bagged for storage; or the isooctanol and the isobutyric acid are matched to be used as the mildew preventive, namely the isooctanol and the isobutyric acid are added into the rice, the rice is turned over, and the rice is uniformly mixed and then stacked or bagged for storage. The invention can better solve the problems that the moisture content of the rice is increased due to rain wetting and the like in the process of harvesting the rice or storing the rice, but the drying capacity of a drying machine is limited and the rice cannot be dried in time, or the rice is mildewed in a short time due to the fact that the rice cannot be dried in time in rainy days.)

1. The emergency mildew-proof treatment method of the rice is characterized by comprising the following steps:

isooctyl alcohol is independently used as a rice mildew preventive and is added into rice;

alternatively, isooctanol is used in combination with isobutyric acid as a rice antifungal agent to be added to rice.

2. The method for the emergency mildewproof treatment of rice according to claim 1, wherein when isooctanol is used alone as the mildewcide, the isooctanol is added in an amount of 0.6 to 2.0g/kg in terms of the mass of the rice.

3. The method for the emergency treatment of rice according to claim 1, wherein when isooctanol is used in combination with isobutyric acid as a fungicide, the total amount of isooctanol and isobutyric acid added is 0.6 to 2g/kg based on the mass of rice, and the mass ratio of isooctanol to isobutyric acid is controlled to 1:0.2 to 0.6.

4. An emergency mildewproof treatment method of rice as claimed in claim 1, wherein:

the isooctanol is independently used as the mildew preventive, namely the isooctanol is directly added into the paddy or the isooctanol is firstly added into a slow release carrier, then the slow release carrier containing the isooctanol is added into the paddy, the paddy is turned over, and the mixture is stacked or bagged for storage after being uniformly mixed;

or the isooctanol and the isobutyric acid are matched to be used as the mildew preventive, namely the isooctanol and the isobutyric acid are directly added into the rice or the isooctanol and the isobutyric acid are firstly added into a slow-release carrier, then the slow-release carrier containing the isooctanol and the isobutyric acid is added into the rice, the rice is turned over, and the rice is stacked or bagged for storage after being uniformly mixed.

5. The method for the emergency treatment of rice according to claim 4, wherein the slow release carrier is one of a slow release card and a slow release granule.

6. An emergency mildewproof treatment method for rice as claimed in claim 5, wherein the slow release card is prepared by using paper sheets; the size specification of the slow release card is 3-8 cm in length, 3-8 cm in width and 1-3 mm in thickness.

7. An emergency treatment method for rice as claimed in claim 5, wherein said slow release granule is prepared from inert neutral diatomaceous earth and calcium stearate.

8. An emergency treatment method for preventing mildew of rice as claimed in claim 7, wherein said slow release granule is prepared by: mixing neutral diatomite and calcium stearate according to the mass ratio of 6-24: 1, adding a proper amount of water, uniformly mixing, drying, finishing and sieving to obtain the slow-release granules.

9. An emergency mildewproof treatment method for rice as claimed in claim 5, wherein the slow release particles have a particle size of 0.5 to 1 mm.

10. An emergency treatment method for rice grains according to any one of claims 1 to 9, wherein the rice grains are high-moisture rice grains having a moisture content of more than 15%.

Technical Field

The invention belongs to the technical field of rice storage and mildew prevention, and particularly relates to an emergency mildew-proof treatment method for rice.

Background

China is a big country for rice planting and consumption, and the total rice yield is the first world. China's rice planting is mainly in the mode that peasant household dispersed planting, because the cost input of rice drying machinery is great and the stoving process power consumption is big, the peasant household adopts the mode of natural sunning to carry out the drying of corn mostly after the corn results, if can not in time sunning in rainy weather, then causes the loss of mildening and rot of corn easily. The water content of the harvested rice is usually more than 20 percent and even more than 30 percent; when the water content of the rice exceeds 25 percent, the rice can be mildewed and even germinate after being stacked for about 24 hours, and serious economic loss is caused to farmers. According to statistics, the mildew loss rate of rice stored by farmers in China is about 2% on average, and the loss rate of rice stored by partial farmers is even more than 10%. Not only does the mildew cause a loss of the amount of rice, the mycotoxin produced also seriously threatens the physical health of the consumer. Therefore, rice mildew resistance is an important research topic for a long time. The problems that the traditional chemical mildew preventive has negative influence on the environment and causes drug resistance of the mildew are increasingly prominent, and the search for a safe and efficient novel rice mildew preventive is necessary.

Chinese patent (publication No. CN112715650A) discloses a composite mildew preventive for paddy and a preparation method and application thereof, Chinese patent (publication No. CN111869729A) discloses a composite plant mildew preventive for paddy and a preparation method thereof, Chinese patent (publication No. CN103039604A) discloses a composite natural plant extract paddy mildew preventive and a preparation method thereof, and the mildew preventive technologies are all applicable to conventional storage mildew prevention of paddy and have no effective data for mildew prevention of high-moisture paddy; meanwhile, plant extracts are used in the mildewcide, and the stability of the using effect of each batch of products cannot be ensured because the components of the plant extracts are not clear and the content of effective components is difficult to detect. Chinese patent (publication No. CN104286169B) discloses a biological mildew-proof particle suitable for transporting high-moisture-content grains and a use method thereof, the mildew-proof particle can be used for mildew prevention during transportation of corn, rice and wheat with the initial moisture content of more than 15%, the components of the mildew-proof particle contain 18-45% of borax, the borax has sterilization and corrosion prevention effects, but the toxicity of the borax is high (the poisoning dose of adults is 1-3 g), and if the borax is used in a large amount, the harm of residues to the environment and human bodies cannot be ignored.

Disclosure of Invention

Aiming at the problems, the invention provides an emergency mildew-proof method for rice, which can better solve the problems that the moisture content of rice is increased due to rain wetting and the like during the rice harvesting or storing process, but the drying capacity of a drying machine is limited and the rice cannot be dried in time, or the rice is mildewed in a short time due to the fact that the rice cannot be dried in time in rainy days.

The invention is realized by the following technical scheme.

An emergency mildew-proof method for rice is characterized in that: isooctyl alcohol is independently used as a rice mildew preventive and is added into rice; or isooctanol and isobutyric acid are used in combination to be added into the rice as a rice mildew preventive;

isooctyl alcohol and isobutyric acid are two volatile substances with strong anti-mildew activity which are screened from the volatile substances produced by bacillus in the previous research process by the applicant; both substances are synthetic spices for food, which are allowed to be used in GB2760-2014 food additive use standard; subchronic inhalation toxicity studies showed that no adverse effects were observed in body weight, mortality, organ weight, clinical biochemistry and hematology parameters in experimental rats at concentrations of 120ppm isooctanol [ Klimisch H J, Deckardt K, Gembardt C, et al food & Chemical Toxicology,1998,36(3):165- & 168 ]. Isobutyric acid, a natural volatile substance in food products, is present in fresh apples, apricots and apple brandy and the like, and is free from genetic toxicity, skin allergy, respiratory toxicity and environmental toxicity (Api a M, belsio D, Biserta S, et al, food and Chemical Toxicology,2020: 111673.); at present, no report on the application of isooctanol or isobutyric acid in grain mildew prevention research is found.

According to the specific technical scheme, when isooctanol is used as a mildew preventive independently, the addition amount of the isooctanol is 0.6-2.0 g/kg based on the mass of rice.

Specifically, when isooctanol and isobutyric acid are used in combination as a fungicide, the total amount of isooctanol and isobutyric acid added is 0.6 to 2.0g/kg based on the mass of rice, and the mass ratio of isooctanol to isobutyric acid is controlled to 1:0.2 to 0.6.

The applicant finds that, because isooctyl alcohol and isobutyric acid have strong volatility, after the isooctyl alcohol and the isobutyric acid are directly added into paddy, the isooctyl alcohol and the isobutyric acid can be volatilized fast in a paddy pile or a packaging bag, and the effective mildew-proof concentration of the isooctyl alcohol and the isobutyric acid is difficult to maintain in a period of time, so that the mildew-proof stability of the isooctyl alcohol and the isobutyric acid cannot be ensured; as a specific technical scheme, the emergency mildew-proof treatment method of the paddy comprises the following steps:

the isooctanol is independently used as the mildew preventive, namely the isooctanol is directly added into the paddy or the isooctanol is firstly added into a slow release carrier, then the slow release carrier containing the isooctanol is added into the paddy, the paddy is turned over, and the mixture is stacked or bagged for storage after being uniformly mixed;

or the isooctanol and the isobutyric acid are matched to be used as the mildew preventive, namely the isooctanol and the isobutyric acid are directly added into the rice or the isooctanol and the isobutyric acid are firstly added into a slow-release carrier, then the slow-release carrier containing the isooctanol and the isobutyric acid is added into the rice, the rice is turned over, and the rice is stacked or bagged for storage after being uniformly mixed;

by the mode, isooctanol and isobutyric acid are added into the slow-release carrier, so that the volatilization rate of isooctanol and isobutyric acid can be reduced, isooctanol and isobutyric acid slowly volatilize in the paddy, the time for maintaining effective mildew-proof concentration of isooctanol and isobutyric acid in the paddy is prolonged, and the effects of improving mildew-proof stability and mildew-proof effect are finally achieved; in addition, isooctanol and isobutyric acid are added into the slow-release carrier, so that the isooctanol and isobutyric acid can be better mixed with the rice uniformly, and can be removed by screening in the later period, thereby reducing the edible safety risk of the isooctanol and isobutyric acid which are remained in the rice due to direct addition;

preferably, when isooctanol is used as a mildew preventive alone and is directly added into rice, the addition amount of the isooctanol is 0.6-2.0 g/kg based on the mass of the rice; when isooctanol and isobutyric acid are used in combination as a mildew preventive and are directly added into rice, the total addition amount of isooctanol and isobutyric acid is 0.6-2 g/kg based on the mass of the rice, and the mass ratio of isooctanol to isobutyric acid is controlled to be 1: 0.2-0.6.

Preferably, when isooctanol is used as a mildew preventive alone and is added into a slow release carrier for use, the addition amount of the isooctanol added into the rice along with the slow release carrier is 0.6-2.0 g/kg based on the mass of the rice; when isooctanol and isobutyric acid are used in a matched mode as a mildew preventive and are added into a slow-release carrier for use, the addition amount of isooctanol and isobutyric acid added into rice along with the slow-release carrier is 0.6-2.0 g/kg based on the mass of the rice, and the mass ratio of the octanol to the isobutyric acid is controlled to be 1: 0.2-0.6.

As a specific technical scheme, the slow release carrier is one of a slow release card and a slow release granule; preferably, the slow release card is prepared by adopting paper sheets; the slow release particles are prepared from inert materials, namely neutral diatomite and calcium stearate.

As a specific technical scheme, the particle size of the slow-release particles is 0.5-1 mm, so that the slow-release particles can be conveniently screened from the rice.

As a specific technical scheme, the size specification of the slow release card is 3-8 cm in length, 3-8 cm in width and 1-3 mm in thickness.

As a specific technical scheme, the sustained-release granules are prepared by adopting the following method: mixing neutral diatomite and calcium stearate according to the mass ratio of 6-24: 1, adding a proper amount of water, uniformly mixing, drying, finishing and sieving to obtain the slow-release granules.

As a specific technical scheme, the rice is high-moisture rice with the moisture content of more than 15%.

The invention has the following beneficial effects:

1) the method can control the total number of the moulds in the rice to be not more than 10³CFU/g order of magnitude, and can effectively control the fatty acid value, the aflatoxin content and the ochratoxin content of the rice.

2) The effective components of the isooctyl alcohol and the isobutyric acid used in the invention are edible synthetic flavors, and are safe to human, livestock and environment.

3) The effective components of the isobutyric acid and the isooctanol used in the invention belong to volatile substances, and can be diffused under normal pressure and uniformly distributed in the paddy; in the later stage of ventilation drying, isooctanol and isobutyric acid can be volatilized and removed from the rice, the residue is low, and the color and the smell of the rice are not affected.

4) The method has a good emergency mildew-proof effect on the paddy with high moisture content, and can also be used for short-term mildew prevention of the paddy or the rice which suddenly faces the risk of easy mildew, such as the situation that the surface of the paddy is dewed due to the change of air temperature, the storage humidity of the paddy is suddenly increased due to the change of climate, the short-term mildew prevention of the bagged rice after the bagged rice is unsealed and dampened, and the like.

Detailed Description

The present invention is further described in the following detailed description, which should be construed as illustrative only and is not intended to limit the scope of the invention, as defined in the appended claims, as all equivalent alterations and modifications which come within the spirit of the invention are desired to be protected by the following claims.

The isooctyl alcohol and the isobutyric acid used in the embodiment of the invention are both made-in-China reagents, and the purity is more than 99.0%. The rice is early indica rice harvested in the same year. The total number of the mold is determined according to GB4789.15-2016 (food microbiology inspection) mold and yeast count), and the fatty acid value is determined and the taste scoring method is determined according to GB/T20569-2006 (rice storage quality judgment rule). The determination of the water content of the rice refers to GB 5009.3-2016 (national food safety Standard) determination of water in food). The aflatoxin B1(AFB1) and ochratoxin A (OTA) are respectively detected by an aflatoxin B1 enzyme-linked immunosorbent assay kit and an ochratoxin enzyme-linked immunosorbent assay kit.

Example 1

Minimum Inhibitory Concentrations (MIC) and Minimum Bactericidal Concentrations (MBC) of isooctanol and isobutyric acid against 7 common molds in rice.

In the previous research work, the minimum inhibitory concentration and the minimum bactericidal concentration of isooctanol and isobutyric acid on 7 common molds in rice are respectively determined by using a two-partition culture dish method. Of the 7 tested molds, Aspergillus flavus (Aspergillus flavus) and Rhizomucor pusillus (Rhizomucor pusillus) were purchased from the China center for general microbiological culture Collection; aspergillus ochraceus (Aspergillus ochraceus) and Fusarium graminearum (Fusarium graminearum) were purchased from the China center for agricultural microbial culture Collection; aspergillus niger (Aspergillus niger), Rhizopus sp and Penicillium sp were maintained in the laboratory and the results are shown in tables 1 and 2.

TABLE 1 MIC and MBC of isooctanol against 7 molds

Note: "-" indicates that no corresponding MIC or MBC values were detected over the range of concentrations tested (10, 20, 30, …, 150. mu.L/dish). "μ L/L" is "μ L/dish" converted to the corresponding headspace concentration.

TABLE 2 MIC and MBC of isobutyric acid against 7 moulds

Note: "-" indicates that no corresponding MIC or MBC values were detected over the range of concentrations tested (10, 20, 30, …, 150. mu.L/dish). "μ L/L" is "μ L/dish" converted to the corresponding headspace concentration.

As shown in tables 1 and 2, isooctanol and isobutyric acid have good bacteriostatic effects on 7 tested molds, isooctanol with the concentration of 30 mu L/dish can completely inhibit the growth of 6 molds except penicillium, but isooctanol with the concentration of 150 mu L/dish still cannot kill aspergillus flavus, which indicates that the aspergillus flavus has certain drug resistance to isooctanol. And the concentration of the isobutyric acid is 40 mu L/dish, the aspergillus flavus can be completely killed, and the bacteriostasis effect of the isobutyric acid on fusarium graminearum and penicillium oxalicum is better than that of isooctanol from the MIC or MBC value. However, since isobutyric acid itself has a heavy odor and is acidic, the fatty acid value of rice measured after adding it to rice is high, and therefore, isobutyric acid is not suitable for use as a fungicide added alone to rice.

Example 2

The embodiment provides an emergency mildew-proof method for rice, which comprises the steps of directly and uniformly spraying isooctyl alcohol on rice by taking the isooctyl alcohol as a mildew-proof agent, uniformly mixing, bagging and standing at normal temperature; meanwhile, the total number of molds, fatty acid value, AFB1 and OTA content in the rice were determined after 5d by using the rice without any mildew preventive added under the same conditions as a control CK, and the results are shown in Table 3.

The initial moisture content of the rice treated in this example was 23.5%, the initial fatty acid value was 15mg/100g, and the amount of isooctanol added was 1.5g/kg based on the mass of the rice.

TABLE 3 mildew-proofing effect of paddy by the method of example 2

As can be seen from Table 3, the total number of molds of the rice treated by the method of example 2 of the present invention was reduced by two orders of magnitude as compared with the control group, and the fatty acid value was within the range of the desirable value (30.0 mg/100g or less) specified in GB/T20569-2006 rules for determination of rice storage quality, whereas the fatty acid value of the rice of the control group exceeded the severe undesirable value (37.0mg/100 g). The AFB1 content and the OTA content of the rice treated by the method in the embodiment 2 are lower than the limit values in the mycotoxin limit in national standard food for GB2761-2017 food safety, while the AFB1 content and the OTA content of the rice in a control group exceed the limit values. After 5 days of storage, the rice treated by the method of the embodiment 2 of the invention has slightly isooctanol odor under the condition of not being placed in a ventilated place, and sensory evaluation is carried out for the rice according to GB/T20569-2006 rice storage quality judgment rule, and the evaluation value is 72. The control group had mildewed rice and was not edible and no sensory scoring was performed.

Example 3

The embodiment provides an emergency mildew-proof method for rice, which is characterized in that isooctanol and isobutyric acid are matched to be used as mildew-proof agents, the isooctanol and the isobutyric acid are directly matched to be used and uniformly sprayed on the rice (the isooctanol and the isobutyric acid can be uniformly mixed and then sprayed, or the isooctanol and the isobutyric acid can be separately sprayed according to the using amount), and the mixture is uniformly mixed, bagged and placed at normal temperature; meanwhile, the paddy without any mildew preventive added under the same conditions is used as a control CK. After 5 days, the total number of molds, fatty acid value, aflatoxin B1 and ochratoxin a content of the rice were measured, and the results are shown in table 4.

The initial moisture content and the initial fatty acid value of the rice used in this example were the same as those of the rice in example 2, and isooctyl alcohol was added in an amount of 1.0g/kg by mass of the rice, and isobutyric acid was added in an amount of 0.5g/kg by mass of the rice.

TABLE 4 mildew-proofing effect of paddy by the method of example 3

As can be seen from Table 4, the total number of molds of the rice treated by the method of example 3 of the present invention was reduced by two orders of magnitude compared with the control group, the fatty acid value did not exceed the suitable storage value (less than or equal to 30.0mg/100g), and both the AFB1 content and the OTA content were lower than the corresponding limit values; the fatty acid value of the paddy in the control group exceeds the serious unsuitable value, and the AFB1 content and the OTA content both exceed the limit values. The treatment method of example 3, in which isooctanol and isobutyric acid were added simultaneously, had a lower effect on the flavor quality of rice since the concentrations of isooctanol and isobutyric acid used were lower than those of isooctanol in example 2, and the taste score of rice after 5 days storage without ventilation was higher than that of example 2. After the rice is placed in a ventilating way for 24 hours, the rice has no smell of residual medicine, and the smell is completely recovered to be normal.

From examples 2 to 3, it can be seen that the total number of mold in the rice was greatly reduced compared to the control group, the fatty acid value was lower than that of the control group, and the taste score was higher than that of the control group. The fatty acid value of the rice treated by the method is in a proper range, and the content of AFB1 and OTA does not exceed a limit standard; the fatty acid value of the rice of the control group mostly exceeds the proper storage value, and the AFB1 and OTA content of the rice of the control group with 23.5 percent of water content after the rice is stored for 5 days at room temperature exceeds the limit standard. Therefore, the method disclosed by the invention can play an effective emergency mildew-proof effect on the high-moisture paddy. When the method is used for mildew-proof treatment of high-moisture rice, emergency mildew-proof is limited to a short period (generally not more than 10 days), and the method cannot be used as a long-term storage method of the high-moisture rice. When the drying or airing conditions are allowed, the moisture content of the high-moisture rice should be reduced to be below the safe moisture content in time, and the rice can be stored for a long time.

Example 4

The embodiment provides an emergency mildew-proof method for rice, which comprises the steps of taking isooctanol as a mildew-proof agent independently, adding the isooctanol into a slow-release card, adding the slow-release card containing the isooctanol into the rice, uniformly mixing, bagging or stacking the mixture indoors, and standing the mixture at normal temperature; meanwhile, the paddy without any mildew preventive added under the same conditions is used as a control CK. After 7d, the mixture is sieved to remove the slow release card, and the total number of the paddy mold, the fatty acid value, the contents of aflatoxin B1 and ochratoxin A are measured, and the results are shown in Table 5.

Wherein, the initial moisture content of the rice used in this example was 20%, and the initial fatty acid value was 18.7 mg/kg; the slow release card is made of paper sheets, the size of the slow release card is 3cm in length, 3cm in width and 0.1cm in thickness, the slow release card is immersed in isooctanol when in use, the slow release card is taken out for immediate use after the slow release card is adsorbed and balanced, and the total adsorption amount of the isooctanol (namely the total amount of the isooctanol added into the rice along with the slow release card) is controlled to be 1.5g/kg based on the mass of the rice.

TABLE 5 mildew-proofing effect of paddy by the method of example 4

As is clear from Table 5, the decrease rate of the total number of mold in the rice of example 4 was 99.2% as compared with the control group, and the fatty acid value was preferably less than 30 mg/kg. While the fatty acid value of the rice in the control group is more than 30mg/kg and less than 37mg/kg, so the rice is not suitable for mild storage. The AFB1 content and the OTA content in the paddy rice of the control group and the paddy rice of the embodiment do not exceed the limit standards, and the AFB1 content and the OTA content in the paddy rice of the embodiment are both obviously reduced compared with the control group. The results of the taste scores indicated that: the control group had a slightly musty taste with a score of 65; the rice of this example had a normal odor, no chemical odor and no musty off-flavor after the release card was removed, and had a score of 79.

Example 5

The embodiment provides an emergency mildew-proof method for rice, isooctanol and isobutyric acid are matched to be used as mildew-proof agents, isooctanol and isobutyric acid are added into slow-release particles, then the slow-release particles containing a mixture of isooctanol and isobutyric acid are added into the rice, and the rice is uniformly mixed and then bagged or stacked indoors and placed at normal temperature; meanwhile, the paddy without any mildew preventive added under the same conditions is used as a control CK. After 7d, the granules were removed by sieving, and the total number of molds, fatty acid value, aflatoxin B1 and ochratoxin a content of the rice were measured, and the results are shown in table 6.

The initial moisture content of the rice used in this example was 16.2%, and the initial fatty acid value was 18.7 mg/kg; the sustained-release granules are prepared by adopting the following method: weighing neutral diatomite and calcium stearate according to a mass ratio of 8:1, adding a proper amount of water, uniformly mixing, drying, finishing granules, and sieving to prepare slow-release granules with the granularity of 0.5-1 mm; when the sustained-release particles are used, the sustained-release particles are immersed in a mixed solution of isooctanol and isobutyric acid (the isooctanol and the isobutyric acid are uniformly mixed in advance according to the mass ratio of 2:1 g/g), after the sustained-release particles are adsorbed and balanced, the sustained-release particles are taken out for immediate use, and the total adsorption amount of the isooctanol and the isobutyric acid (namely the total addition amount of the isooctanol and the isobutyric acid added into the rice along with the sustained-release particles) is controlled to be 1.5g/kg based on the mass of the rice.

TABLE 6 mildew-proofing effect of paddy by the method of example 5

As can be seen from table 6, the total number of mold in the rice of this example was reduced by 98.0% compared to the control group, and the fatty acid value of the rice of this example was preferably maintained. The fatty acid value of the control group rice was slightly not suitable for storage. The AFB1 and OTA contents in the paddy rice of the control group and the paddy rice of the embodiment do not exceed the limit standard, but the AFB1 content and the OTA content in the paddy rice of the embodiment are obviously reduced compared with the control group. The results of the taste scores indicated that: the control group had a slightly musty taste with a score of 69; the rice of this example had a normal odor, no chemical odor and no musty odor, and a score of 80.

From examples 4 and 5, it can be seen that adding isooctanol or a mixture of isooctanol and isobutyric acid to a sustained-release carrier, and then adding the sustained-release carrier containing isooctanol or a mixture of isooctanol and isobutyric acid to rice can achieve a good anti-mildew effect, and the addition is convenient; meanwhile, the slow release carriers (slow release cards and slow release particles) can be completely removed after use, so that the risk of edible residues of isooctyl alcohol and isobutyric acid is reduced.