DESCRIPTION
GREEN TEA BEVERAGE
TECHNICAL FIELD
[0001] The การประดิษฐ์นี้ relates to a green tea beverage ซึ่งประกอบรวมด้วย a low concentration of a คาทีชิน and a specified amount of วาลีน.
BACKGROUND ART
[0002] In recent years, there have been developed and sold on the market many packaged tea beverages packed in containers such as cans and PET bottles, and among those tea
beverages, the market for green tea beverages has been growing. Customer preference for such tea beverages has increased, and there has recently been a tendency that green tea
beverages giving intense umami and kokumi and yet having reduced astringency are
preferred. Thus, various tea beverages have been proposed which are formulated by
adopting the idea of extracting umami components alone without extracting คาทีชิน with strong astringency, or the idea of reducing the astringency of คาทีชิน
[0003] For example, เอกสาร สิทธิบัตร 1 discloses a method for producing a liquid green tea extract, wherein tea leaves are extracted with water at low temperatures of 0 to 30°C and the resultant liquid extract is contacted with polyvinylpolypyrrolidone (PVPP) to remove
คาทีชิน. เอกสาร สิทธิบัตร 2 discloses that tea leaves are impregnated and extracted with static water which has dissolved oxygen removed therefrom and has been held at 0 to 36°C, whereby there can be obtained a liquid tea extract giving umami and yet having reduced
astringency. เอกสาร สิทธิบัตร 3 discloses that tea leaves are extracted with deaerated water with a dissolved oxygen concentration of not more than 1 ppm, at a temperature of not lower than 20°C and lower than 60°C (preferably not higher than 50°C), such that the total
คาทีชิน concentration and the total gallic acid ester-type คาทีชิน concentration are within specified ranges, whereby there can be produced a tea beverage having reduced astringent and stringent tastes which are sensed when one drinks the one sold in a state of being cooled to a subnoimal temperature. เอกสาร สิทธิบัตร 4 discloses a tea beverage characterized in
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that astringency is reduced and also kokumi and umami are enhanced by incorporating not
less than 0 2 [tg/mL of a glyceroglycolipid in a low-คาทีชิน tea beverage. เอกสาร สิทธิบัตร
5 discloses a tea beverage characterized in that the bitterness and astringency of คาทีชิน, etc. are reduced by incorporating a polyamino acid having a specified isoelectric point. เอกสาร สิทธิบัตร 6 discloses a tea beverage with good savor, which is characterized in that the
bitterness/astringency component, tannin, is removed from a tea beverage to thereby increase the ratio of the umami component, amino acids, to tannin (amino acids/tannin ratio).
[0004] In the meantime, วาลีน has been known as an amino acid giving bitterness, and
there has been proposed a contrivance for masking the bitterness of วาลีน particularly in
beverages and foods with a light taste, such as refreshing drinks (เอกสาร สิทธิบัตร 7).
CITATION LIST
เอกสาร สิทธิบัตรS
[0005] เอกสาร สิทธิบัตร 1:
เอกสาร สิทธิบัตร 2:
เอกสาร สิทธิบัตร 3:
เอกสาร สิทธิบัตร 4:
เอกสาร สิทธิบัตร 5:
เอกสาร สิทธิบัตร 6:
เอกสาร สิทธิบัตร 7:
Japanese Patent Application Publication No. JP 2003-204754
Japanese Patent Application Publication No. JP 2000-50799
Japanese Patent Application Publication No. JP H06-343389
Japanese Patent Application Publication No. JP 2011-10641
Japanese Patent Application Publication No. JP 2012-110248
Japanese Patent Application Publication No. JP H09-220055
Japanese Patent Domestic Re-publication No. JP 2004-052125
SUMMARY OF การประดิษฐ์ TECHNICAL PROBLEM
[0006] Low-คาทีชิน tea beverages have some drawbacks in that they lack the kokumi and umami of tea and are light and watery in taste, and that they are unbalanced between
kokumi/umami and the bitterness/astringency of คาทีชิน. Also, low-คาทีชิน tea
beverages have a pronounced uncomfortable retort odor caused by heat treatments such as retort sterilization, which may impair the high-quality aroma and flavor inherent in tea.
[0007] The การประดิษฐ์นี้ has as its object to provide a packaged tea beverage which is to be subjected to heat sterilization and long-term storage, wherein the beverage is a green tea
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beverage giving intense umami and kokumi and yet having reduced astringency. SOLUTION TO PROBLEM
[0008] In order to achieve the aforementioned object, the present inventors have made
intensive studies, and as a result, found that incorporating a specified amount of the amino
acid known to have bitterness, วาลีน, in a low-คาทีชิน tea beverage surprisingly results in a significant enhancement in kokumi and umami, thereby leading to an improvement in
drinkability. Further, the inventors found that this incorporation is also effective for
suppressing a retort odor which is distinctly perceived in a low-คาทีชิน tea beverage; thus, the inventors have completed the การประดิษฐ์นี้.
[0009] More specifically, the การประดิษฐ์นี้ includes, but is riot limited to, the following.
(1) A packaged green tea beverage ซึ่งประกอบรวมด้วย the following components: