Frozen dry jujube and preparation thereof

Abstract

A freeze dried jujube is prepared from fresh jujube through removing kernel, pre-freezing and freeze drying in vacuum freeze drier where water is directly sublimated. Its advantages are less loss of nutrients, and original color and taste.

Description

Technical field [0001] The invention relates to jujube and jujube drying, in particular to a freeze-dried jujube prepared by vacuum freeze-drying technology, and also relates to a preparation method of the freeze-dried jujube. Background technique [0002] Jujube is a fruit with high medicinal and nutritional value. Fresh jujube is sweet and sour, rich in sugar, vitamins, protein, amino acids and trace elements, especially high in VC, which is known as live vitamin pills. But because the water content is about 70% in the fresh jujube, it is difficult to preserve and transport, according to statistics, the loss quantity of fresh jujube is up to 20%-30% every year because of rot, and the number is very alarming. [0003] The traditional drying of jujube has two methods: air-drying and drying-drying. The air-drying drying method is to place fresh jujubes under natural conditions, and rely on sunlight and natural ventilation to evaporate and dry. The drying time is 3-4 weeks. D...

AI Technical Summary

Problems solved by technology

The dried jujubes are slightly hygienic, but due to long-term high-temperature treatment, the loss rate of nutrients is also high

The red dates dried by the above two methods all lose the original flavor and characteristics of fresh dates, not only the loss of nutrients is serious, the taste changes, but also the shape of dried red dates shrinks, the shape changes greatly, and the dried products shrink. High rate