Low-temperature instant agar and preparation method thereof

Abstract

The invention discloses low-temperature instant agar and a preparation method thereof. The method comprises the steps: soaking seaweeds in an alkaline solution, and executing heating and filtering toobtain alkali-treated seaweeds; filtering and washing the alkali-treated seaweeds to obtain seaweeds washed for the first time; soaking the seaweeds in a bleaching agent, and executing even mixing, standing and filtering to obtain bleached seaweeds; soaking the bleached seaweeds in an acidic solution, and executing even mixing, standing and filtering to obtain acidified seaweeds; filtering and washing the acidified seaweeds to obtain seaweeds washed for the second time; adding the seaweeds washed for the second time into water, executing even mixing, heating and centrifuging to obtain a glue solution; adding a hydrogen peroxide solution, carrying out a methoxy group removing reaction, adding a biological enzyme, executing even mixing, and introducing ozone-containing gas into the glue solution; executing drying, crushing and sieving to obtain the low-temperature instant agar. The low-temperature instant agar prepared by the preparation method has low dissolving temperature, high gel strength, no introduction of other substances, high safety and good quality.

Description

technical field

[0001] The invention relates to the technical field of agar production, in particular to a low-temperature instant agar and a preparation method thereof. Background technique

[0002] Agar, scientific name agar, is one of the most widely used seaweeds in the world. It is mainly a kind of polysaccharide extracted and prepared from red algae such as Gracilaria and Echinacea, and its main component is the sulfate of polygalactose. Agar is a linear polymer whose basic structure is a long chain of 1,3-linked β-D-galactose and 1,4-linked 3,6-lactone-L-galactose alternately linked. Agar is a hydrophilic colloid, insoluble in cold water but soluble in hot water. Generally, it can be dissolved in water when it is heated to above 90 °C. When the temperature drops to 35-40 °C, a good semi-solid gel is formed. The agar molecular chain contains a large number of hydroxyl groups. Due to the hydrogen bonding, the molecular chain changes from a random coil to a double heli...

Images