摘要:
Provided is a process for producing a tea extract having a high recovery rate of non-polymer catechins, a low caffeine content and an improved taste and color tone. As one embodiment of this invention provides, there is provided a process for producing a purified tea extract by adsorbing a tea extract on a synthetic adsorbent, bringing an aqueous solution of an organic solvent or a basic aqueous solution into contact with the synthetic adsorbent to elute non-polymer catechins, and then bringing the eluate into contact with activated carbon in an aqueous solution of an organic solvent.
摘要:
This invention relates to a tea extract, which is reduced in bitterness, sourness and coarse taste, has a good affinity with various beverages, and contains non-polymer catechins that are highly stable in a sterilized beverage to which the tea extract is added.A purified tea extract, including: (1) non-polymer catechins (a) in a solid content accounting for from 45 to 90 wt. %; (2) a percentage of gallate body in the non-polymer catechins being from 0.001 to 47 wt. %; and (3) a weight ratio of a gallic acid/the non-polymer catechins being not greater than 0.3.
摘要:
Provided is a production method for a purified tea extract having improved solubility of the non-polymer catechins in a solvent. The production method for a purified tea extract according to the present invention comprises bringing a tea extract into contact with a magnesium-type or lithium-type cation exchange resin.
摘要:
A purified green tea extract is improved in bitterness and aftertaste.The purified green tea extract, which comprises satisfying the following conditions: (1) a ratio of a sum of content weights of (A) myricetin, (B) quercetin and (C) kaempferol to a sum of content weights of (D) epigallocatechin gallate and (E) gallocatechingallate, ((A)+(B)+(C))/((D)+(E)), is from 0.0000001 to 0.010, (2) a sum of content weights of (D) the epigallocatechin gallate and (E) the gallocatechin gallate in non-polymer catechins, ((D)+(E))), is from 0.01 to 29 wt %, and (3) a percentage of gallate body in the non-polymer catechins is from 0.01 to 49 wt %.
摘要:
This invention relates to a tea extract, which is reduced in bitterness, sourness and coarse taste, has a good affinity with various beverages, and contains non-polymer catechins that are highly stable in a sterilized beverage to which the tea extract is added.A purified tea extract, including:(1) non-polymer catechins (a) in a solid content accounting for from 45 to 90 wt. %;(2) a percentage of gallate body in the non-polymer catechins being from 0.001 to 47 wt. %; and(3) a weight ratio of a gallic acid/the non-polymer catechins being not greater than 0.3.
摘要:
A process is provided for making (−)-epigallocatechin gallate (EGCG) by subjecting a green tea extract to chromatography on a macroporous polar resin, eluting EGCG from the resin with a polar elution solvent, optionally concentrating the eluate, optionally regenerating the resin by desorbing the remaining catechins, and optionally concentrating the desorbed catechins.
摘要:
Bitter or otherwise undesirable compounds can be removed from beverages such as tea, coffee or wine by using a natural proteinaceous oat-derived material. This material will also remove noxious compounds such as nicotine from the smoke stream of lighted tobacco products. The liquid or gas is contacted with the material, resulting in the sequestration of the undesirable compounds within the pores of the proteinaceous material.
摘要:
Polyphenolic substances such as food dyes, tannins, fruit juices and wine colorings are removed from a solution by adsorption onto a regeneratable adsorbent polyamide of extended surface and controlled porosity. The surface chemistry of the polyamide may be modified by a glutaraldehyde/resorcinol treatment. The polyphenolic substances are recovered by elution with water or other protonic solvent.