A lychee and longan fresh-keeping agent with nano-chitosan as main ingredient and preparation method thereof

Abstract

The invention discloses a litchi and longan antistaling agent mainly composed of nano-chitin and a preparation method. The peels of longan and lychee are composed of three layers. These structures are conducive to the evaporation of water, resulting in dehydration and dryness of the fruit, accelerating browning, and are also conducive to the invasion and reproduction of pathogenic microorganisms, accelerating rot and deterioration. Above-mentioned these factors, constitute for many years litchi, longan fresh-keeping difficulty, storage difficulty. The present invention prepares a colloidal solution from nano-sized chitin to preserve freshness of lychee and longan, supplemented by temperature control at 2-5°C, and can preserve freshness for 40-50 days. After 40 days, the water content is only reduced by 4.8%, and the sugar content is reduced by 4.8%. Increased by 2%, the color of the shell and the flavor of the pulp remained basically unchanged. The raw materials of the invention are easy to obtain and the production cost is low.

Description

technical field [0001] The invention relates to a preservative for litchi and longan, especially a preservative for litchi and longan mainly composed of nano-chitin, and also relates to a preparation method of the preservative. Background technique [0002] The cultivated area and output of litchi and longan in my country rank first in the world, and they are domestically produced bulk fruits. It is widely welcomed and loved by consumers at home and abroad. [0003] Litchi is a plant of the genus Litchi in the Sapindaceae family. It is the least resistant to storage and transportation among southern fruits. Its peel has a special structure: it consists of three layers: exocarp, mesocarp and endocarp. The exocarp is several layers of closely arranged sclerenchyma cells, covered with an impermeable horny layer; the mesocarp is composed of palisade tissue and spongy tissue, and the spongy layer is thicker, accounting for most of the mesocarp, and conducts the tissue network....

AI Technical Summary

Problems solved by technology

Because ordinary chitin is insoluble in water and edible acids, there is no relevant report on its use as a preservative for litchi and longan

In particular, it is prepared into a nanometer state, and then applied to the preservation of litchi and longan. No relevant literature disclosures have been found after searching