New technology for extracting tea saponin and tea seed oil from tea seeds by using water as solvent

Abstract

The invention relates to a new technology for extracting tea saponin and tea seed oil from tea seeds by using water as a solvent. The invention uses water as a solvent, firstly extracts tea saponin from the tea seeds, and then extracts the tea seed oil. The invention comprises the technological processes of tea seed husking and cleaning, tea seed crushing, four-stage counter-current water immersion and extraction by externally heating, emulsion breaking and separation, centrifuging and dewatering, ultra-filtration and purification, nano-filtration and concentration, and spray drying. The material after the tea seed oil is extracted can be recycled and made into feed additive. The technological method is simple and feasible. The nutrient components in the oil, the active substances and the flavour of the tea oil are not lost in the oil making process. The refining process does not generate secondary pollution. The obtained refined tea seed oil has limpid oil colour.

Description

technical field [0001] The invention relates to a process for directly extracting tea saponin and tea seed oil from tea seed kernels, in particular to a process for directly extracting tea saponin and tea seed oil from tea seed kernels with water as a solvent. Background technique [0002] At present, tea seed oil is mostly extracted by steaming-pressing-extraction process. Although tea seed oil has a high oil yield, the extracted tea seed oil must go through complex refining in order to meet the edible quality standard of tea seed oil, which not only affects The nutritional value of tea seed oil is compromised, and the loss of tea seed oil in the refining process is relatively large, the actual oil yield is low, and it does not meet the production requirements of green food and organic food. In addition, waste water and waste residues during extraction and processing pollute the environment. The high temperature and high pressure in the traditional tea seed oil extraction ...

AI Technical Summary

Problems solved by technology

During the extraction process, due to the existence of water, a large amount of starch in tea seeds will be gelatinized and protein will be colloidized, resulting in difficulty in solid-liquid separation, and the product is highly water-absorbent and sticky, requiring high drying temperature, which will often cause tea saponin to deteriorate. break down, darken

Evaporation and concentration of water extract is not only difficult, but also energy-intensive

At present, the tea saponin obtained by the water extraction method has low purity, deep black color and high viscosity, which limits the application of tea saponin. In recent years, some methods of extracting tea saponin with water as a solvent and then refining For research work, for example, heat and pressurize oil tea cakes in airtight containers to 0.2-1.2Mpa, etc., and then extract them with water; Macroporous adsorption resin adsorption and desorption are used to refine tea saponin, but these methods all have defects such as low product yield, high processing cost, and large equipment investment to varying degrees, and it is difficult to do large-scale industrialization.

[0004] At present, the industrial production of tea saponin is generally extracted with aqueous solvents such as methanol or ethanol, but the extraction time increases, the product yield is not high, the solvent has certain toxicity, equipment requirements and processing costs are high.