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Preservation and freshness preservation of fresh jujube
Jujube is one of the fruit trees native to China and its fruit is rich in nutrients. However, fresh dates are extremely resistant to possession. Here are some technical points for the storage and preservation of fresh jujube: First, the selection of resistant collection species generally considers late-maturing varieties more resistant to early maturing varieties; crack-resistant varieties are more resistant to hiding; small fruit-type varieties or large-fruit-type fl . Second, the appropriate period of correct harvesting production based on the degree of jujube fruit surface turning red into full red (100% coloring), semi-red (about 50% coloring) and early red (coloring below 25%) three maturity levels mining Received. Jujube fruit used for storage should be harvested in the semi-red period, so that both the storage resistance and the quality are taken into account. The stored jujube fruit should be picked by hand and is strictly prohibited from being beaten, shaken, etc., and picking should be preserved. Since the flowering date of the jujube is very long, the result is early or late, so the ripening period is too late. It should follow It is required to pick in batches in order to achieve a consistent maturity of jujube fruit for each harvest. Third, the fresh jujube storage requirements of environmental conditions Fresh jujube suitable storage temperature of -05 °C -0 °C. As fresh jujube fruits have less waxy layer on the surface and water retention performance is poor, the water loss rate of fresh jujube at room temperature is 5-7 times that of apple, and the fruit with lower maturity is faster, so the storage environment is kept. More than % relative humidity is particularly important for the storage of fresh dates. Fourth, storage methods 1. Refrigerated bags can be stored in bags such as perforated bags, cartons, wooden boxes, and plastic turnover boxes. The specific approach is: The fresh dates taken will be selected and placed in a cold store for 1-2 hours of pre-cooling, and then put into 0.01-0.02 mm thick non-toxic polyvinyl chloride or polyethylene film bags. 2.5 kilograms, two small holes on the two sides of the middle of the bag, each with a diameter of about 1 cm (both accurate and simple with a cigarette butt), and then they are placed upright on multi-layer storage shelves. When using the box lined storage bag method, it is best to use 0.03 mm thick non-toxic PVC film, each box is not more than 10 kilograms, after the fruit is installed, the bag mouth can not be sealed, and the cover can be folded. Before the mouth is covered, the mouth should be fully pre-cooled and stored until the fruit temperature falls close to the storage temperature. Fruit boxes should be stacked in "goods", and vents should be left between the boxes. It is better to pretreat the fruit before storage and use 2% calcium chloride + 30 mg/kg gibberellic acid for fruit for 30 minutes to improve the fruit storage effect. The soaked fruit should be dried in time and then bagged and stored. . 2. Atmosphere storage of stored fresh dates should be controlled at a temperature of -1°C to 0°C, a relative humidity of 95%, oxygen of 3%-5%, and carbon dioxide of less than 2%. Air-conditioned storage of jujube fruit, apply fresh preservatives before storage.