Effects of controlled atmosphere storage on storag

2022-10-16
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Effects of controlled atmosphere storage on storage tolerance and quality of Annona fruit

Abstract: This paper analyzed the effects of controlled atmosphere storage on storage tolerance and quality of Annona fruit. The results showed that the storage life of low mature, medium mature and high mature Annona fruits at room temperature were D, D and 0 d. The storage life of modified atmosphere at room temperature was longer than that of the control group by D, 4D and 5D, while the cold storage air conditioning was extended by D, 13D and 6 d; The weight loss rate and content loss of fruits were lower than those of the control group

key words: Annona squamosa L., also known as LinQin, Sakya fruit, commonly known as sweet litchi, sweet fruit, is a deciduous small tree in the Annona family. It is native to tropical America and is now widely distributed in the tropical and warmer subtropical regions of the world. In addition to tropical America as the main production area, Asia is the earliest and most cultivated in India. In addition, Malaysia, Indonesia It is cultivated in the Philippines, Sri Lanka and other countries. It is cultivated in several provinces in southern China, especially in Hainan, Guangdong, Fujian, Taiwan and other provinces and regions. The main varieties of Annona chinensis cultivated in Guangdong Province are Annona chinensis (common Annona chinensis), followed by: smooth Annona chinensis, prickly fruit Annona chinensis, ox heart Annona chinensis, hairy leaf Annona chinensis (Peru Annona chinensis or alpine Annona chinensis), atimoye Annona chinensis (the main variety is AP Annona chinensis) [1], [6], among which, the variety "LinQin" of Zhanglin orchard in Chenghai City, Guangdong Province is the most famous. In 1986, it was evaluated as a high-quality rare fruit in Guangdong Province, Chenghai's "Zhanglin LinQin" (Annona chinensis) won the "Guangdong excellent rare fruit quality variety Award". Cherimoya is rich in nutrients, which is most suitable for fresh eating or making fruit juice and jam. It is favored by the majority of consumers because of its unique flavor, sweet and refreshing []. Because the fresh fruit of Annona chinensis is very perishable, it is not resistant to storage and transportation, which restricts the development of this high-quality fruit. At present, there are few reports about postharvest physiology, storage and preservation of Annona in China. In order to solve the problem of rotten fruit and intolerant storage and transportation of Annona chinensis, we have conducted in-depth research on the Postharvest Physiology and storage and transportation fresh-keeping technology of Annona chinensis in recent years [], and now the test results are reported as follows:

1 materials and methods

1.1 materials

tests were carried out in the Biotechnology Laboratory of our hospital from 1999 to 2001. The test variety "Zhanglin Annona chinensis" (common Annona chinensis) was collected from Zhanglin orchard in Chenghai City, Guangdong Province. As fresh-keeping test materials, the fruits with no pests and mechanical damage, correct fruit shape, yellowish green peel and white powder were selected. After harvest, they were immediately transported to the laboratory, precooled in an air-conditioned room (18 ℃) for 1.5h, and washed with appropriate and non-toxic preservatives (sterilize the surface of Annona chinensis fruit and soak the fruit for 1min), Then dry the fruit with air conditioner. According to the fruit maturity, the fruit is divided into different grades (low maturity is the fruit below eight maturity, medium maturity is the fruit at eight to nine maturity, high maturity is the fruit above nine maturity). The experiment is divided into three groups, and each group is set with three treatments: treatment 1 (room temperature air conditioning): cover the fruit with clean foam (which can reduce the friction between fruits), Then we use our own developed modified atmosphere fresh-keeping bags for cherimoya, which are suitable for researchers to copolymerize it with other linear lactones to improve its mechanical properties at different storage temperatures, and then seal the mouth of the bags for controlled atmosphere storage at room temperature (℃); Treatment 2 (refrigerated air conditioning): the method is the same as that of treatment 1. Put the bagged fruit under low temperature (℃) for refrigerated air conditioning; Treatment 3 (room temperature storage CK): put the fruit in clean foam and directly store it at room temperature (℃) as a control

1.2 determination method

the content of soluble solids (TSS) was determined by Abbe refractometer; Vitamin C (VC) content was determined by 2,6-dichlorophenol indophenol titration [7]; Total acid was determined by acid-base titration; When calculating the weight loss rate, 20 fruits were measured each time and measured by electronic balance; Good fruit refers to the fruit whose color, flavor and quality are close to natural maturity after storage. Repeat the test three times, and finally calculate the average value

1.3 data difference analysis

all data were statistically processed by Excel, and Duncan's new compound polar difference (SSR) method was used for multiple comparisons

2 results and analysis

2.1 effect of storage and preservation of low ripening fruits

the fruits of Annona mongolica with poor maturity begin to soften on the second day of storage, all soften on the fourth day, and the rate of good fruit is zero on the fifth day. The fruits show browning of the peel, gradual loss of flavor, mildew and deterioration, and lose their edible value. After controlled atmosphere cold storage for D, the good fruit rate was 100%, the weight loss rate of fruit was reduced by 5.6% compared with the control group (CK), the sugar content (TSS) and total acid of fruit were reduced by 2.1% (degree) and 0.06% respectively, the VC was reduced (lost) by 1.33mg/100g, and the fresh-keeping period was prolonged for 14-15 days. After controlled atmosphere storage at room temperature for D, the good fruit rate was 100%, the fruit weight loss rate was reduced by 5.4%, the sugar content and total acid were reduced by 0.7% (degree) and 0.07% respectively, and the VC loss was 2.41 mg/100g, extending the fresh-keeping period for D (Table 1)

2.2 effect of storage and preservation of medium ripening fruits

fruits with medium maturity, the fruits of the control (CK) softened on the third day of storage, and the good fruit rate was zero on the fourth day. After controlled atmosphere cold storage for D, the good fruit rate was 100%, the weight loss rate of fruit (CK) decreased by 5.5%, the sugar content and total acid of fruit decreased by 3.3% (degree) and 0.06% respectively, and the VC loss was 2.26 mg/100g, extending the fresh-keeping period for 13 days. After controlled atmosphere storage at room temperature for D, the good fruit rate was 100%, the fruit weight loss rate (CK) was reduced by 5.2%, the sugar content and total acid were reduced by 2.6% (degree) and 0.08% respectively, the VC loss was 3.24 mg/100g, and the fresh-keeping period was prolonged for 4 days (Table 2)

2.3 effect of storage and preservation of high ripening fruits

fully mature fruits, the fruits of the control (CK) all softened on the second day of storage, and then moldy and deteriorated and lost their edible value. After 7-8 days of controlled atmosphere cold storage, the good fruit rate was 100%, the weight loss ratio (CK) of fruit was reduced by 5.2%, the sugar content and total acid of fruit were reduced by 3.9% (degree) and 0.03% respectively, the VC loss was 3.92 mg/100g, and the fresh-keeping period was prolonged by 6 d。 After controlled atmosphere storage at room temperature for 3 days, the good fruit rate was 100%, the fruit weight loss rate (CK) was reduced by 4.8%, the sugar content and total acid were reduced by 1.7% (degree) and 0.06% respectively, the VC loss was 4.85 mg/100g, and the fresh-keeping period was prolonged for 2~2.5 days (Table 3)

3 summary and discussion

3.1 the results showed that controlled atmosphere storage at room temperature and controlled atmosphere refrigeration had fresh-keeping effects on low, medium and highly mature fruits of Annona camphora. Controlled atmosphere storage (CA) at room temperature extended the storage life of low, medium and high ripening fruits by D, 4 D and 4 D, respectively, compared with room temperature storage (CK) 5d; The duration of controlled atmosphere refrigeration was extended by D, 13D and 6 d。 The supply period of fruits is prolonged

3.2 the average weight loss rate of low, medium and high mature fruits during controlled atmosphere storage at room temperature was 7.63%, while that of the control (CK) was 12.77%, with an average decrease of 5.14%. The average sugar content is 25.37% (which can effectively detect the bursting pressure of pipe fittings), and the control (CK) is 27.03% (degrees), with an average decrease of 1.66% (degrees). The average total acid of fruit was 0.227%, and that of control (CK) was 0.297%, with an average decrease of 0.07%. The average VC was 9.26 mg/100g, and the control (CK) was 12.76mg/100g, with an average decrease of 3.5 mg/100g. The average weight loss rate of fruits under controlled atmosphere refrigeration was 7.33%, and the control (CK) was 12.77%, with an average decrease of 5.44%. Sugar content decreased by an average of 3.1%. The total acid of fruit decreased by 0.05% on average. VC decreased (lost) by 2.50mg/100g on average. This shows that the nutritional quality of Annona fruit stored under controlled atmosphere has no significant change compared with the control group

3.3 according to our previous report [5], Annona is a climacteric fruit. Therefore, the method of controlled atmosphere storage can adjust the gas components of the environment in which the fruit is located, reduce the concentration of O2 and increase the concentration of CO2, so as to reduce the respiratory intensity of the fruit, inhibit the activity of enzymes and microorganisms, reduce the production of ethylene, and delay the ripening and senescence of Annona fruit. For cherimoya with poor storage resistance, low temperature is an important condition to reduce its respiratory rate and prolong its storage period, so the effect of cold storage air conditioning is better. Therefore, the experimental results are consistent with literature [5]

3.4 although the storage life of Annona after fresh-keeping treatment has been significantly extended, and the fruit color of Annona during the fresh-keeping period is good, and the edible quality is close to the normal post ripening, it is still difficult to completely inhibit the cracking of fruit in the later stage of storage, affecting the appearance of Annona. There is also a need to regularly change the filter element and hydraulic oil according to the actual use of the machine, so as to control the cracking of cherimoya fruit in the late storage period, reduce the loss of fruit contents (sugar, acid and VC) and extend the fresh-keeping period by a larger margin, which needs to be further studied

author/zhangfuping 1 Chen Weihui 1 Lin dingxiong 2

1 Department of biology, Hanshan Normal University; 2. Hemei village committee, Dongli Town, Chenghai City

source: thesis compilation

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