|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||A23F-003/00 A23F-003/06 A23F-003/14|
|발명자 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 3 인용 특허 : 2|
Fresh tea leaves or green tea are converted to black tea using tyrosinase oxidation which alters catechines (a group of green tea polyphenols) to theaflavins. Theaflavins are unique black tea polyphenols and a potential anti-sunburn and chemopreventive agents. The oxidation reaction is performed on leaves which contain moisture only in an amount that the oxidation reaction occurs under the conditions of temperature of 20-50° C., air or O2(0.2 to 2 moles O2/kg dry tea) supply and pH 5.0 to 7.5 at localized sites on and within the tea leaf structure. The m...
1. An improved black tea produced through a process involving the steps of: selecting a measure of tea leaves; moistening surfaces of said tea leaves with an aqueous tyrosinase solution without immersing said tea leaves therein and only to a degree that substantially no free liquid of said aqueous tyrosinase solution remains after said moistening; exposing said tea leaves, once moistened, to an oxidizing agent; drying said tea leaves to derive black tea. 2. The black tea of claim 1 wherein the moisture content of said tea leaves after said moiste...