Method for producing grape seed extract

Abstract

The invention provides a method for producing a grape seed extract, which comprises the following steps: (1) separation: immediately separating grape dregs, which are produced in a wine preparation process, grape juice production process or any other grape working process without fermentation, into grape skin, grape seed and scrap; and (2) extraction: A. extraction: extracting by using alcohol and water as an extraction solvent under the conditions of low oxygen content, low humidity and high pressure, wherein the ratio of water to alcohol is 30:70, and the ratio of grape seed to solvent is 1:10; B. concentration: concentrating the liquid part in a concentrator to eliminate the water phase; and C. drying: drying the concentrated eluate or any product from the concentrator. The invention has the following advantages: before any fermentation situation occurs, the seed and skin in the grapes can be directly separated; in the obtained extract, the content of polyphenols is high, and the content of monomeric substances is low; and by referring to the scrap extraction process, the grape seed can also be used for producing grape seed oil.

Description

technical field [0001] The invention relates to a method for producing grape seed extract, which belongs to the technical field of food processing. Background technique [0002] In food production, polyphenols are very useful as compounds or additives, and play an important role in the production of high concentration, high purity and low cost. Several factors concerning the raw material, and their influence on the quality and quantity of polyphenols in plants, have been the object of several research projects, such as: stress induction (Cantos E, 2001; Rivero R M , 2001), degree of maturity (Lattanzio V, 2001; Gooding P S, 2001; Kennedy J A, 2000; Chevalier T, 1999; Murata M, 1997; Joy ​​R W 4 th , 1995) and cultivation type (Chang S, 2000; Sanoner P, 1999) and other factors. [0003] To date, there has been a lack of understanding of the impact of key factors. There are many key factors, such as the production of alcohol due to the fermentation of raw materials that o...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are as follows: 1) various solvents are used, resulting in the inability to extract a variety of beneficial proanthocyanidins; 2) this method requires many steps, such as filtration and incubation, so it takes a long time and a large workload; 3 ) the use of carcinogenic chlorinated solvents can cause various pollution problems and industrial hygiene problems; 4) it is impossible to completely remove acetone, methanol or acetate without forming an azeotropic mixture; 5) all extraction processes Both starting from grape pomace with skins and seeds, these processes pass through an alcohol tank, which removes the alcohol through all the substrates; the waste from this process is sent to a dryer for drying, reducing the humidity to about 4%, and then The skin and seeds are separated on a separation screen or seed separator, polyphenols are also extracted while alcohol is removed, and monomer content is increased due to passing through a dryer; 7) In general, the final treatment Steps are performed at high temperatures and of short duration to minimize production time and reduce costs

Due to the poor quality of the grape seeds used in these processes, these grape seeds are often used as an ignition source for dryers, or for the production of grapeseed oil due to the high unsaturated oil content of the grape seeds, so far, no practical method has been developed , to selectively extract polyphenols from grape seeds and reduce the content of monomeric polyphenols

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