How long can winter dates be eaten?
Winter jujube is rich in nutrition, but it is not resistant to storage. Stored in natural conditions after harvest, it only has a crisp period of about one week. In recent years, with the development of storage technology, the preservation period of winter jujube can reach 70- 120 days.
What are the storage methods of winter jujube? 1. Refrigerator storage:
If you don't buy a lot of winter dates, just a few kilograms. You can divide them into small bags with fresh-keeping bags, pick out the rotten ones with ginger, leave some air in them and put them in the refrigerator. When you want to eat them, you can tear open a small bag to eat. This kind of preservation can last for two or three weeks, and a few kilograms of winter dates will be eaten up.
2. Store in a cool place:
If the refrigerator at home is full or you don't plan to store it in the refrigerator, you can separate the winter dates with fresh-keeping bags or boxes and put them in a cool place. Be careful not to ventilate. Unlike other fruits, winter jujube can't be stored in ventilation, and ventilation will only speed up its dehydration and drying.
3. Mass storage of winter jujube:
If a large number of winter jujubes are harvested at home during the harvest period, first, winter jujubes suitable for preservation should be selected (the red skin degree should not exceed one third), and the selected winter jujubes should be soaked in 2% calcium chloride solution for 30 minutes, precooled at 5~8℃ for two days, and then stored in the cold storage at 0 ~ 65438 0℃ and the relative temperature of 90%~95%.
The storage options of winter jujube are as follows: 1. Harvest time: Harvest maturity has a great influence on storage life, that is, the lower the maturity, the better the storage resistance. The first red fruit (colored below 25%) is the most storable, and the whole red fruit (colored 100) is the most storable. Those stored for fresh food can be harvested in the semi-red period, those stored for processing can be harvested in the pre-red period, and those stored for short period can be harvested in the whole period. 2. Temperature and humidity: In the temperature range above freezing point, the lower the temperature, the better the storage effect, and frostbite will occur below freezing point. The freezing point of winter jujube with different maturity is also different. Generally, the freezing point of half jujube is around -2.4℃, and that of early jujube is higher than this value. The freezing point of whole jujube is lower than this value. Therefore, winter jujube with different maturity should be stored separately. Winter jujube is also a fruit that is easy to lose water, and the humidity suitable for winter jujube storage under cold storage conditions is 90%-95%. 3, o2, co2 content: under the condition of refrigeration, o2 content should be controlled at 3%-6%. In the storage environment with high temperature control accuracy, the o2 content should be low, which can improve the fresh-keeping quality. In the storage environment with large temperature error, the o2 content should be high to prevent anaerobic respiration or co2 poisoning. Winter jujube trees are very sensitive to co2 and are not suitable for sealed storage. The co2 content higher than 5% will accelerate the softening and browning of winter jujube, and the suitable co2 content is 2%-4%. Packaging with 0.05mm thick pvc perforated bag can prevent co2 poisoning and keep the humidity in the bag.