Grape preservation method, how to keep grapes fresh?

Grapes are a kind of fruit that many people like to eat, and the market time is relatively concentrated, but it is a fruit that belongs to the berry category, and under natural conditions, the storage time is relatively short. How do you keep grapes fresh? It is mainly divided into sporadic family preservation and batch preservation by fruit farmers.

Grapes can be stored fresh, which can extend the time to market and eat time, and the more commonly used preservation methods are as follows: 1. Hanging branches to keep fresh. This method is the most natural, safest, most energy-efficient and most cost-effective, and can also increase the sugar content of grapes, which is best for late-maturing varieties.

If you do not remove the fruit bag, do not pick, hang on the branches of the grape tree, and do not drop the fruit until mid-October, and the grapes are more colorful and sweeter. Late-maturing varieties such as American red grapes, beauty fingers, and ice beauties can be picked until the temperature drops to about zero degrees, and the wine varieties ice grapes can be hung until the snow freezes, and the ice wine produced at this time is of high quality. For late-maturing varieties, you can also build a plastic greenhouse to keep warm when the temperature drops to about zero degrees, so that the grapes can be hung on the branches and stored until late December, and directly after picking, the New Year's Day market.

The Jufeng grapes of the Shanghai grape production base were still hanging on the grape branches on October 15 (October 15, 2013**) 2. Refrigerated and preserved. That is, cold storage fresh storage, this preservation method has a long storage time, can be listed in batches according to market demand, and generally choose late-maturing varieties for storage, grapes are picked, basketed, pre-cooled, and then the storage temperature is kept at about 0 degrees, and it is best to fill nitrogen in the cold storage to inhibit grape respiration and bacterial activity reproduction. 3. Keep the refrigerator fresh.

This preservation method is suitable for a small amount of storage at home, it is best to choose grapes without a fruit bag, the appearance of the fruit bag is clean and clean, indicating that the grapes in the bag are intact, if the fruit bag appears from the inside to the outside of the water soaking, indicating that the grapes inside are rotten, it is best not to buy. If you put the grapes you bought home directly in the refrigerator, you can keep them fresh for about a month.

1. Place in a cool place: This method is for friends who do not have a refrigerator, if the fresh grapes just bought back cannot be eaten, and there is no refrigerator at home, how should they be preserved? Don't panic at this time, you can directly store the grapes in a cool place, don't wash them!

The point is that it must not be washed, wrapped in newspaper, so that it can be left for 3 to 5 days.

2. Cling film sealing: This method is also suitable for friends who do not have a refrigerator, directly put the leftover grapes that have not been eaten into the plate and pack them, and then seal them with plastic wrap to avoid the oxidation of Puao by a large amount of air. Then store it in a cool place.

3. Refrigerated preservation: how to keep grapes for a long time, it is very simple for friends who have refrigerators at home, you can put the grapes that cannot be eaten on the plate, be careful not to clean, and then put them in the refrigerator refrigerator, the temperature does not need to be too low, generally about 0, so that it can be stored for a week, but it should also be eaten as soon as possible.

4. Add preservative: If you want to store grapes for a long time, you can also add fruit and vegetable preservatives to keep them fresh, you can use the method of soaking leaves and spraying on grapes, and then put them in the refrigerator room, so that they can be stored for up to one month and will not deteriorate. However, it should be noted that it must be cleaned after taking it out.

Grapes are first sprinkled with water and drenched, and then put them in the refrigerator to cool down, don't freeze them, take them out and wrap them in plastic wrap and put them in a cool place, which can keep them fresh for about a week. Another way is to dry the water directly and it is not dry, so it can be left for about 5 days. In short, you can put it in the refrigerator for half a month, but it won't be fresh after a long time.

Grape storage and preservation practices: 1. Wash the whole bunch of grapes, and remove any cracked and bad fruits. 2. Use a towel or paper towel to dry the surface of the grapes.

3. Use scissors to carefully cut the grapes one by one at the junction of the grape stem and the fruit. Grapes on the inner side should be dried if there is residual moisture. 4. Put the cut grapes in a zipper bag with the amount to be eaten at one time, and put them on ice in the freezer of the refrigerator.

In this way, the grapes can be stored for more than three months, and when they want to eat, they can be thawed naturally, and the flavor will not be reduced. You can also eat this natural ice hockey pucks directly without thawing, the grape aroma is stronger, and the astringency of the skin is also reduced and easier to eat! As long as they are stored properly, fragile and perishable grapes can be stored for a long time, and the cell walls of the frozen grape skins are destroyed, and the vitamins contained in the skins are more easily absorbed.

Wrap the roots of the grapes in plastic wrap to reduce the loss of moisture and keep them fresh for a longer time.

The best way to keep grapes fresh is to keep them cold or refrigerated.

I don't know how to keep it fresh, if you want to keep it fresh, you can't put it at a temperature of 3 to 5 degrees below zero to 3434 degrees above zero.

Don't wash all the grapes you buy when you buy them, the surface of the grapes has a natural protective effect, and if you wash them off, it will accelerate oxidation and deterioration.

There are two or three situations in which grapes are transported during transport. 1.own metabolism, second.

Collisions of various fine breeding, the third during transportation. Traditional methods, such as smoking with sulfur dioxide and soaking with preservatives, can play a role in preservative preservation but are harmful to the human body. The plastic wrap and packaging bags of Hengbaojia brand make there no grain loss, no damage, and no fermentation during transportation.

Grapes are perishable and threshed after harvest, which is not conducive to storage and transportation. The following describes the method of grape preservation and storage: fumigation:

Place the grapes in an airtight room and add a fumigant to allow them to evaporate naturally. Commonly used fumigants include sec-butylamine and sulfur dioxide. In general, the concentration of sec-butylamine is grape, and the concentration of sulfur dioxide is 10-20 ppm.

In addition, each cubic meter of space can be fumigated with 2-3 grams of sulfur for 20-30 minutes, and then ventilated, which also works well. These fumigants are mainly used to prevent the grapes from rotting due to fungal infections during storage. Interpretation Method:

Sodium bisulfite and anhydrous silica gel were weighed according to the weight of the grapes. After mixing thoroughly, put it in several small paper bags and change the medicine bag once a month and a half. The jar method is to put the treated grapes into the sterilized jar in layers, each layer is 15-20cm high, supported by a bamboo curtain support, filled with polyethylene plastic film, sealed and tied tightly, and placed in a cool place.

Fazang ditch runs north-south, 80 centimeters deep, 30 meters wide at the top, and 1 meter wide at the bottom. The bottom of the ditch is covered with 10 cm thick dry sand. The treated grapes are arranged one ear at a time on the sand at the bottom of the ditch.

A layer of wet sand – a layer of grapes can be stacked in 3-4 layers, and finally covered with 20-30 cm thick wet sand. As the temperature drops, gradually increase the mulch. Refrigerated harvested grapes are processed and packed into polyethylene film bags, quickly placed in MSC$ and NSS warehouses, pre-cooled after opening the bags, and then stored with preservatives.

The temperature in the warehouse should be kept between -1 and 2 and the fluctuation should not be too large. The relative humidity should be 90-95%, oxygen 3-5%, and carbon dioxide 2-5%. Different varieties of grapes can be stored for 2-6 months, and the good fruit rate is more than 95%.

This method is a common and effective method of grape storage and preservation. Frozen grapes have a long shelf life, no preservatives are required, and all varieties are fine. The general operation is as follows:

The grapes are cleaned after harvesting, drained and soaked in sodium hypochlorite solution for a few minutes, rinsed with water and threshed, then put in 1% sodium chloride and citric acid solution to protect the color, then drained, quickly cooled to 0-5, and frozen to -18 with a fluidized freezing device.