Process for producing purified tea extract
AssigneeKao Corporation
InventorsEizo Maruyama, Yukiteru Sugiyama, Kenichi Shikata, Keiji Shibata, Hideaki Ueoka
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Abstract
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.
Claims12
A process for producing a purified tea extract, comprising adsorbing a tea extract on a synthetic adsorbent, washing the synthetic adsorbent with a basic aqueous solution or ethanol at a solvent concentration of from 0 to 5 wt %, contacting the synthetic adsorbent with ethanol at a solvent concentration of from 10 to 80 wt % to elute non-polymer catechins, and then bringing the eluate into contact with activated carbon in ethanol, wherein the synthetic adsorbent is an acrylic resin, methacrylic resin, polyvinyl resin or styrene resin.
A process for producing a purified tea extract, comprising adsorbing a tea extract on a synthetic adsorbent, eluting said tea extract with a basic aqueous solution by contacting the synthetic adsorbent with said basic aqueous solution to elute non-polymer catechins, adjusting the pH of the eluate to 7 or lower, concentrating the eluate, and then subjecting the eluate to solid-liquid separation to remove precipitated and suspended matters, wherein the synthetic adsorbent is an acrylic resin, methacrylic resin, polyvinyl resin or styrene resin.
A process for producing a purified tea extract, comprising adsorbing a tea extract on a synthetic adsorbent, washing the synthetic adsorbent with ethanol at a solvent concentration of from 0 to 5 wt %, and then contacting the synthetic adsorbent with a basic aqueous solution or ethanol at a solvent concentration of from 10 to 80 wt % to fractionate a tea extract having a percentage of non-gallates as non-polymer catechins in a range of from 55 to 100 wt % and a caffeine/non-polymer catechins of from 0 to 0.15, wherein the synthetic adsorbent is an acrylic resin, methacrylic resin, polyvinyl resin or styrene resin.
Dependencies are inferred from the claim text.