阅读说明：本技术 一种莲雾冻干片的制备方法 (Preparation method of wax apple freeze-dried tablets ) 是由 魏雪纹 王莉 于 2018-09-17 设计创作，主要内容包括：本发明公开了一种莲雾冻干片制备方法。以莲雾鲜果为原料,经清洗、切片、装盘、冷冻干燥制得,所述的冷冻干燥分六段进行：第一段在1.5小时降温至-35℃,保持3小时,抽真空；第二段1小时升温至-5℃,保持2.5小时；第三段0.5小时升温至0℃保持2.5小时；第四段0.5小时升温至10℃保持2.5小时；第五段1小时升温至35℃保持3小时；第六段1小时升温至50摄氏度,保持7小时。抽真空后真空度不大于15Pa。本发明制备的莲雾冻干片在保存原有莲雾鲜果的色、香、味及营养成分的同时,抑制了多种腐败细菌的滋生,且延长莲雾的储存期限。(The invention discloses a preparation method of a wax apple freeze-dried tablet. The wax apple fresh fruit is taken as a raw material and is prepared by cleaning, slicing, dishing and freeze drying, wherein the freeze drying is carried out by six sections: in the first stage, the temperature is reduced to-35 ℃ within 1.5 hours, the temperature is kept for 3 hours, and the vacuum pumping is carried out; in the second period, the temperature is raised to-5 ℃ for 1 hour, and the temperature is kept for 2.5 hours; in the third stage, the temperature is increased to 0 ℃ for 0.5 hour and kept for 2.5 hours; in the fourth stage, the temperature is increased to 10 ℃ for 0.5 hour and kept for 2.5 hours; in the fifth period, the temperature is raised to 35 ℃ for 3 hours after 1 hour; and in the sixth period, the temperature is raised to 50 ℃ for 1 hour and is kept for 7 hours. The vacuum degree after vacuum pumping is not more than 15 Pa. The freeze-dried wax apple slices prepared by the invention inhibit breeding of various putrefying bacteria and prolong the storage life of wax apples while preserving the color, the fragrance, the taste and the nutritional ingredients of the original fresh wax apples.)

1. The preparation method of the wax apple freeze-dried tablets is characterized by comprising the following steps:

(1) pretreatment of raw materials: selecting fresh, mature and pest-free wax apples, soaking in 1% hydrochloric acid solution for 15min, and then washing with clear water;

(2) slicing: the special stainless steel cutter is adopted for operation, the speed is high, the raw materials are prevented from being exposed in the air for a long time, and the slicing thickness is 4-6 mm;

(3) loading a plate: when the raw materials are placed in the tray, the raw materials are uniformly and flatly placed one by one without being stacked, and then the loaded trays are sequentially placed in a vacuum freeze dryer;

(4) and (3) freeze drying: freeze-drying according to a set freeze-drying curve, and dividing into six sections: in the first stage, the temperature is reduced to-35 ℃ within 1.5 hours, the temperature is kept for 3 hours, and the vacuum pumping is carried out; in the second period, the temperature is raised to-5 ℃ for 1 hour, and the temperature is kept for 2.5 hours; in the third stage, the temperature is increased to 0 ℃ for 0.5 hour and kept for 2.5 hours; in the fourth stage, the temperature is increased to 10 ℃ for 0.5 hour and kept for 2.5 hours; in the fifth period, the temperature is raised to 35 ℃ for 3 hours after 1 hour; and in the sixth period, the temperature is raised to 50 ℃ for 1 hour and is kept for 7 hours.

(5) Packaging: the fruit slices are taken out immediately after vacuum freeze drying and are packaged in vacuum, so that the fruit slices are prevented from being exposed in the air for a long time.

2. The method for preparing the wax apple freeze-dried tablet according to claim 1, which is characterized in that: the vacuum degree after vacuum pumping is not more than 15 Pa.

Technical Field

The invention belongs to the technical field of fruit and vegetable processing, and particularly relates to a preparation method of a wax apple freeze-dried tablet.

Background

Wax apple is a good fruit for treating various diseases, has sweet and mild nature and functions of moistening lung, relieving cough, eliminating phlegm, cooling blood and astringing. It can be used for treating cough due to lung dryness, singultus, abdominal distention, enteritis, dysentery, and diabetes, and can also be used for treating traumatic hemorrhage by grinding semen Persicae into powder. In addition, Hainan folk has a theory of eating wax apple to clear lung-heat and fire, people regard it as a good fruit for relieving summer heat and quenching thirst, and are accustomed to using it to boil crystal sugar to treat dryness and cough without phlegm or difficult expectoration with phlegm. It has slight sour taste, and has apple fragrance, and fragrance of teeth and cheeks after eating it.

Freeze-drying, referred to as freeze-drying, is best used in the pharmaceutical industry, first tested and succeeded in the laboratory by russian scientists, and later used in the united states as space food for astronauts. The birth of the freeze-drying technology fundamentally solves the problems of food preservation and nutrition of astronauts during the working period of space, so the freeze-drying technology is also called as the astronavigation food technology. In recent years, freeze-drying technology has been expanded and used in civilian fields, and freeze-dried fruits have become common.

The syzygium samarangense in Hainan is short in picking time and not storage-resistant, can be stored for only one week at room temperature generally, and is suitable for being immediately sent to markets for sale after being picked and packaged. The invention prepares the wax apple into the freeze-dried fruit slices, can prolong the storage life and is suitable for people of all ages.

Disclosure of Invention

The invention aims to provide a preparation method of a vacuum freeze-dried wax apple tablet, which can inhibit the breeding of various putrefactive bacteria and prolong the storage life of wax apples while preserving the color, the fragrance, the taste and the nutritional ingredients of the original fresh wax apples.

The invention is realized by the following technical scheme:

a preparation method of a wax apple freeze-dried tablet comprises the following steps:

1. pretreatment of raw materials: selecting fresh, mature and pest-free wax apples, soaking in 1% hydrochloric acid solution for 15min, and then washing with clear water;

2. slicing: the special stainless steel cutter is adopted for operation, the speed is high, the raw materials are prevented from being exposed in the air for a long time, and the slicing thickness is 4-6 mm;

3. loading a plate: when the raw materials are placed in the tray, the raw materials are uniformly and flatly placed one by one without being stacked, and then the loaded trays are sequentially placed in a vacuum freeze dryer;

4. and (3) freeze drying: freeze-drying according to a set freeze-drying curve, and dividing into six sections: in the first stage, the temperature is reduced to-35 ℃ within 1.5 hours, the temperature is kept for 3 hours, and the vacuum pumping is carried out; in the second period, the temperature is raised to-5 ℃ for 1 hour, and the temperature is kept for 2.5 hours; in the third stage, the temperature is increased to 0 ℃ for 0.5 hour and kept for 2.5 hours; in the fourth stage, the temperature is increased to 10 ℃ for 0.5 hour and kept for 2.5 hours; in the fifth period, the temperature is raised to 35 ℃ for 3 hours after 1 hour; and in the sixth period, the temperature is raised to 50 ℃ for 1 hour and is kept for 7 hours. The vacuum degree after vacuum pumping is not more than 15 Pa.

5. Packaging: the fruit slices are taken out immediately after vacuum freeze drying and are packaged in vacuum, so that the fruit slices are prevented from being exposed in the air for a long time.

Detailed Description

The present invention is further illustrated by the following examples, which are set forth to provide details of the practice of the invention and are not intended to limit the scope of the invention.