Blueberry quick-freezing technology

Abstract

The invention discloses a blueberry quick-freezing technology. The technology has the following main points: (1) variety selection: variety selection is shown below; (2) ripeness degree determination: completely ripe blueberries have low hardness and a high moisture content causing high transportation cost and high storage cost, so that 80% ripe blueberries are preferably harvested; (3) selection and grading: simple selection of raw materials is performed to remove fruits which are soft, rotten, diseased and wormy, and fruits which achieve acceptance standards are graded based on the ripeness degree, and fruits which are not proper for instant production are marked and stored in a refrigerating cabinet and are put into production at the right time; (4) rinsing: a bubble washer special for blueberries is adopted to rinse the selected blueberries to remove floating impurities and calcium treatment can be adopted to keep blueberry hardness; (5) drying: a cold-air dryer is used to quickly remove the surface water of the rinsed blueberries in a low-temperature environment to prevent the blueberries to be quick-frozen from sticking to each other; and (6) quick-freezing: the faster a cooling rate is, the smaller the generated ice crystals are, so that a highest possible cooling rate is regarded as an ideal way to obtain high-quality frozen food.

Description

technical field [0001] The invention relates to blueberry quick-freezing technology. Background technique [0002] Blueberry fruit has a unique flavor and is rich in nutrition. It is hailed as the "King of Berries" by the Food and Agriculture Organization of the United Nations. In addition to fresh blueberry fruit, blueberry products are also favored by consumers, such as blueberry drinks, blueberry wine, blueberry dairy products and blueberry snack foods. The production of these products requires a large amount of blueberry raw materials for a long time, but blueberry is a watery berry, and the ripening period of the fruit is in the hot and rainy season from June to August. The harvested fruit will start to rot after 2 to 7 days under normal temperature conditions, so it is not suitable for storage. How to preserve blueberries for a long time after harvest and break through the seasonal limitations of blueberry processing on the supply of raw materials has become a key tech...

AI Technical Summary

Problems solved by technology

However, inappropriate quick-freezing and thawing methods will destroy the nutrition and commodity value of blueberries. The market price is several times lower than that of fresh fruits. The development of the industry urgently needs blueberry quick-freezing technology suitable for industrialization.