WO2011055789A1 - アミノ酸を高濃度に含有する茶飲料 - Google Patents
アミノ酸を高濃度に含有する茶飲料 Download PDFInfo
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- WO2011055789A1 WO2011055789A1 PCT/JP2010/069709 JP2010069709W WO2011055789A1 WO 2011055789 A1 WO2011055789 A1 WO 2011055789A1 JP 2010069709 W JP2010069709 W JP 2010069709W WO 2011055789 A1 WO2011055789 A1 WO 2011055789A1
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- WIPO (PCT)
- Prior art keywords
- tea
- furaneol
- ppm
- amino acid
- tea beverage
- Prior art date
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- HFHDHCJBZVLPGP-UHFFFAOYSA-N schardinger α-dextrin Chemical compound O1C(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC(C(O)C2O)C(CO)OC2OC(C(C2O)O)C(CO)OC2OC2C(O)C(O)C1OC2CO HFHDHCJBZVLPGP-UHFFFAOYSA-N 0.000 description 1
- 235000004400 serine Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 229940026510 theanine Drugs 0.000 description 1
- 235000008521 threonine Nutrition 0.000 description 1
- OUYCCCASQSFEME-UHFFFAOYSA-N tyrosine Natural products OC(=O)C(N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-UHFFFAOYSA-N 0.000 description 1
- 235000019607 umami taste sensations Nutrition 0.000 description 1
- 239000004474 valine Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F3/00—Tea; Tea substitutes; Preparations thereof
- A23F3/16—Tea extraction; Tea extracts; Treating tea extract; Making instant tea
- A23F3/163—Liquid or semi-liquid tea extract preparations, e.g. gels or liquid extracts in solid capsules
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
Definitions
- the present invention relates to a tea beverage containing an amino acid at a high concentration, and more particularly, to a packaged tea beverage containing an amino acid having a good taste with a reduced heat-deteriorating odor at a high concentration.
- Technologies for suppressing the generation of off-flavors due to heat treatment include technologies that incorporate heat-degraded odor components into the additive molecule to prevent heat-degraded odors, technologies that previously remove components that cause off-flavors (heat-degraded odors), etc. are known.
- a method for removing retort odor by adding cyclodextrin to a green tea extract Patent Document 1, Non-Patent Document 1
- An example is a method for producing a tea beverage (Patent Document 2) in which, after removal, the residual tea is re-extracted with warm water of 30 to 95 ° C.
- furaneol which is widely used as a fragrance ingredient having a good fruit-like flavor, can be added to tea beverages to become a fragrance enhancer of jasmine tea-specific fragrance (Patent Document 3).
- Furaneol is known to have an effect as a sweetness enhancer (Patent Document 4), and can be added to tea beverages to impart the natural sweetness inherent in high-grade tea leaves. Is also disclosed (Patent Document 5).
- Patent Document 6 bitterness and astringency derived from non-polymer catechins can be alleviated by adding furaneol to a non-tea beverage containing a high concentration of catechins
- JP-A-1-174328 JP-A-11-113491 JP 2006-206915 A Japanese Patent Laid-Open No. 40-140659 JP 2007-167003 A JP 2008-295370 A
- green tea has been evaluated as a good quality tea or a good extraction method as the taste of amino acids leached from tea leaves like gyokuro is high, and it has a low catechin content and a strong umami taste with a green tea with excellent flavor Because it is often said that it is a product, the taste of consumers is increasing, and even in packaged tea beverages, the high amino acid content in tea leaves, so-called high-quality tea brewed in a teapot, taste and richness Development of tea beverages that are strong and have reduced astringency and bitterness is desired.
- container-packed tea beverages with high amino acid content produce a unique heat-degraded odor by heat sterilization treatment at the time of manufacture, and there is also a problem that the heat-degraded odor is emphasized during long-term storage, and the preference is lowered or discolored. there were.
- the conventional technology for suppressing the generation of off-flavors due to heat treatment is not sufficiently satisfactory for tea beverages having a high amino acid content, and is not an industrially advantageous means.
- the present invention is to provide a packaged tea beverage that is easy to drink by alleviating the heat-deteriorating odor peculiar to tea beverages containing amino acids at a high concentration by a simple method.
- the inventors of the present invention blended various flavor components into a tea beverage containing a high concentration of amino acids, and examined the influence on the heat-deteriorating odor. As a result, it has been found that there is an action to alleviate the heat-deteriorating odor of a tea beverage in which an amino acid is specifically mixed with furaneol at a high concentration. Further, as a result of further studies, the present inventors have found that if a certain amount or more of caffeine is present, the action of mitigating the heat-degraded odor of furaneol is enhanced, and the amount of furaneol having a fruit-like flavor is reduced. It has been found that only an unpleasant heat-degraded odor can be alleviated with little influence on the aroma and flavor of the present invention, and the present invention has been completed.
- a packaged tea beverage produced by heat sterilization comprising the following (a) to (c): (A) Amino acid 40 ppm or more (b) Caffeine 150 ppm or more (c) Furaneol 50 ppb or more. 2.
- the tea beverage according to 1 above further comprising (d) pyrazines, wherein the ratio of furaneol to pyrazines ((c) / (d)) is 2.0 or more.
- the tea beverage according to 1 or 2 above, wherein the content of catechins is 600 ppm or less. 4). 4.
- generated by heat processing can be relieve
- furaneol which is an effective ingredient for alleviating the heat-deteriorating odor of the present invention
- tea leaves it is derived from tea without the use of fragrances and additives (excluding antioxidants).
- fragrances and additives excluding antioxidants
- Furaneol which is an active ingredient of the tea beverage of the present invention, is 2,5-dimethyl-4-hydroxy-3 (2H) -furanone (4-hydroxy-2,5-hydroxy), which is known as the trade name of Firmenich. dimethyl-3 (2H) -furanone), the following formula (1)
- furaneol is useful for pineapple flavor, strawberry flavor, raspberry flavor, and sugar type flavor, and the concentration used in the final product is about 5.0 to 10.0 ppm (synthetic fragrance chemistry and product knowledge, Motoichi Into, Chemical Industry Daily, 2005).
- the present invention by containing a specific amount of furaneol, it is possible to alleviate a heat-deteriorating odor in a tea beverage containing an amino acid at a high concentration.
- the effect of alleviating the heat-degraded odor of furaneol is more effective as the amount added increases, but the fruity flavor of furaneol may impair the original flavor of tea beverages.
- the tea beverage of the present invention by containing a specific amount of caffeine, the action of furaneol is synergistically enhanced, and furaneol is used at a very low concentration, that is, a concentration that does not affect the original aroma and flavor of the tea beverage.
- the caffeine content capable of enhancing the action of low-concentration furaneol is 150 ppm or more, preferably 200 ppm or more, based on the whole tea beverage, and the upper limit of caffeine is usually 500 ppm, preferably 450 ppm, more preferably about 400 ppm. It is.
- the furaneol in the present invention is 50 to 200 ppb, preferably about 50 to 100 ppb, in the final product (tea beverage that has been heat sterilized).
- Furaneol may be a commercially available product, a synthetic product, or an extract from a natural product.
- Swiss Patent No. 474500 describes the manufacturing method.
- furaneol isolated and purified from synthetic products or natural products furaneol may be used as it is by adding it to tea beverages as it is. It is preferable to use it as a fragrance composition by dissolving it in a solvent (for example, ethanol).
- the furaneol of the present invention is preferably a tea leaf-derived furaneol from the viewpoint of flavor, particularly preferably added in the form of a tea leaf extract. It has been reported that there is a clear correlation between the high-quality tea leaves and the furaneol content (see Patent Document 5, Table 1).
- an extract obtained by removing or reducing the component causing the off-flavor (heat-degraded odor) from the high-quality tea leaves for example, the extract from the second decoction after extraction at low temperature, Patent Document 2
- an extract obtained by fractionating a component containing a large amount of furaneol from tea leaves by steam distillation or the like for example, the extract from the second decoction after extraction at low temperature, Patent Document 2.
- the conditions for steam distillation include a condition where the space velocity (SV) is 20 to 100 (unit: 1 / h) under normal pressure.
- pyrazines The tea beverage of this invention can relieve
- pyrazines include methylpyrazine, 2,5-dimethylpyrazine, 2,6-dimethylpyrazine, ethylpyrazine, 2,3-dimethylpyrazine, ethylmethylpyrazine, 3-ethyl-2,5-dimethylpyrazine and the like.
- Pyrazines are components obtained by extraction from those that have been subjected to fire processing with stems or tea leaves obtained from the genus Camellia (for example, C. sinensis, C. assamica, Yabuki species and their hybrids).
- the total amount of 2,5-dimethylpyrazine and 2,6-dimethylpyrazine is referred to as pyrazines (d).
- a certain amount of a stem or tea leaf extract containing a pyrazine compound (d) that has been subjected to burning processing is blended with a whole amount of the beverage, and a tea extract containing furaneol (c).
- the ratio ((c) / (d)) of furaneol and pyrazines in the tea beverage can be adjusted by blending a certain amount of them.
- a bitter taste or a burning odor may appear, but by adjusting within the above range, an additive or synergistic effect of mitigating a heat-degraded odor of furaneol and pyrazines can be obtained.
- a preferred ratio ((c) / (d)) of furaneol and pyrazines is 2.0 or more, more preferably 5.0 or more, and further preferably 11.0 or more.
- the tea beverage of the present invention contains an amino acid at a high concentration of 40 ppm or more (preferably 45 pppm or more, more preferably 50 ppm or more, particularly preferably 55 ppm or more).
- the amino acids referred to in this specification are arginine, lysine, histidine, phenylalanine, tyrosine, leucine, isoleucine, methionine, valine, alanine, glycine, proline, glutamic acid, serine, threonine, aspartic acid, tryptophan, cystine and It is a general term for the 19 amino acids of theanine, and the amino acid content in the tea beverage is defined based on the total amount of the 19 amino acids.
- the amino acid content of a tea beverage is conveniently determined by measuring the amount of amino nitrogen in the tea beverage. A specific measurement method will be described in the section of the example described later.
- the tea beverage of the present invention is a packaged tea beverage manufactured by heat sterilization, and contains (a) amino acid 40 ppm or more, (b) caffeine 150 ppm or more, and (c) furaneol 50 ppb or more. It is a feature.
- caffeine either a synthetic product or a natural product may be used, but the aromatic flavor of high-grade tea can be obtained without using additives other than tea-derived components, which is one of the effects of the present invention.
- tea leaves containing a large amount of caffeine are used as raw materials and extracted at a high temperature (70 ° C. or higher, preferably 75 ° C. or higher, more preferably 80 ° C. or higher, particularly preferably 85 ° C. or higher). The method of adding the obtained tea leaf extract or its concentrate is illustrated.
- catechins are an important factor that determines the flavor of tea beverages.
- the bitterness and astringency of catechins may have an effect on the masking of heat-degraded odors, but the bitterness and astringency of catechins have a strong umami and rich taste reminiscent of the high-quality tea targeted by the present invention, It is not suitable for realizing the flavor of tea beverages with reduced astringency and bitterness.
- the catechin content in the tea beverage of the present invention is preferably adjusted to 600 ppm or less, preferably 500 ppm or less.
- the catechins can be adjusted appropriately depending on the amount of solvent (water), temperature, time, etc.
- catechins can be selectively removed using a conventionally known method such as adsorption resin or activated carbon. You can also In the present specification, catechins is a general term for catechin, epicatechin, gallocatechin, epigallocatechin, catechin gallate, epicatechin gallate, gallocatechin gallate, epigallocatechin gallate, and the catechin content is It is defined based on the total amount of the above eight types.
- Tea beverages containing (a) amino acids of 40 ppm or more, (b) caffeine of 150 ppm or more, and (c) furaneol of 50 ppb or more (preferably catechins of 600 pm or less) of the present invention are produced, for example, as follows.
- a tea extract serving as a base for a tea beverage is obtained.
- tea leaves with a high amino acid content so-called high-grade tea leaves. Specific examples include gyokuro, kabuse tea, and strawberry tea.
- the extraction time varies depending on the temperature and amount of the extraction solvent (water) and the degree of stirring, but is usually 30 seconds to 30 minutes, preferably 1 to 10 minutes.
- tea leaves are separated by a known method.
- an antioxidant such as L-ascorbic acid or a pH adjuster such as sodium bicarbonate may be added.
- the above-mentioned furaneol is added to this base tea extract, diluted to an appropriate concentration, and the contents of caffeine and catechins are adjusted as necessary to obtain the tea beverage preparation of the present invention.
- a tea extract containing a high concentration of amino acids is added to adjust to a predetermined concentration.
- a tea extract described in International Publication WO2009 / 041555 can be exemplified.
- An antioxidant such as L-ascorbic acid and a pH adjuster such as sodium hydrogen carbonate may be added to the tea beverage preparation.
- a pH adjuster such as sodium hydrogen carbonate
- the pH cannot be increased.
- the pH is about 6.0 to 6.4.
- the tea beverage of the present invention can be expected to have an antibacterial activity of furaneol, so that it can be set to a pH exceeding 6.4. Therefore, it is preferable to adjust the pH of the preparation liquid so that the pH of the tea beverage after heat sterilization is 6.4 to 7.0.
- Sterilization of the prepared liquid and filling into a container, or filling into a container and then heat sterilization (such as retort sterilization) can provide a container-packed tea beverage.
- the heat sterilization in the present invention refers to sterilization of the preparation liquid by heating the preparation liquid to 110 ° C. or higher, and examples thereof include retort sterilization and UHT sterilization.
- a predetermined amount of the prepared liquid is filled into a can, and retort sterilization (eg, 110 to 140 ° C., 1 to several tens of minutes) is performed.
- retort sterilization eg, 110 to 140 ° C., 1 to several tens of minutes
- UHT sterilization that is maintained at 120 to 150 ° C. for 1 to several tens of seconds is performed, and a predetermined amount is aseptically filled at a low temperature or hot pack.
- any commonly used container such as an aluminum can, a steel can, a PET bottle, a glass bottle, a paper container, or a cup can be used.
- the furaneol, pyrazines, catechins, caffeine and amino acids contained in the tea beverage of the present invention are measured by the following method.
- TDU-GC / MS manufactured by Agilent Technologies was used for the analysis of furaneol and pyrazines .
- a GERSTEL twister was used for extraction and concentration of aroma components. After 1.5 g of sodium chloride was dissolved in 5 g of the sample, it was extracted by stirring for 1 hour with a twister. Components were quantified by the standard addition method. As standard reagents, Tokyo Chemical Industry Co., Ltd. 2,5-dimethyl-4-hydroxy-3 (2H) -furanone and Tokyo Chemical Industry Co., Ltd. 2,5-dimethyl pyrazine were used. The analysis conditions are as follows.
- HPLC Catechin and caffeine sample tea beverages were filtered through a filter (0.45 ⁇ m) and subjected to HPLC analysis.
- the analysis conditions of HPLC are as follows. Analyzer: Tosoh Corporation, TOSOH HPLC system LC8020 model II [Multistation: LC-8020, Pump: CCMC-II, Autosampler: AS-8021, Detector: UV-8020, Column oven: CO-8020, Online degasser: SD-8023] Analysis conditions: [Column: TSKgel ODS-80TsQA, eluent A: 10% acetonitrile / water 0.05% TFA, eluent B: 80% acetonitrile / water 0.05% TFA, flow rate: 1.0 ml / min, temperature 40 ° C., detection: UV 275 nm].
- the amino acid amino acid measured the amino nitrogen in a drink.
- Amino nitrogen was measured by the TNBS method (trinitrobenzene sulfonic acid method).
- TNBS trinitrobenzene sulfonic acid method
- a tea buffer serving as a sample was mixed with a phosphate buffer solution and a 0.1% 2,4,6-trinitrobenzene sulfonic acid-Na salt aqueous solution, reacted at 45 ° C. for 90 minutes, and then the fluorescence intensity (OD340 nm). ) was measured.
- a calibration curve was prepared from the glycine standard solution, and the amino nitrogen content in the sample was calculated as glycine equivalent.
- Example 1 Furaneol-added tea beverage (1) As the raw material tea, the most tea-covered tea with the highest amino acid content was used, and 25 times the amount of water with respect to the dry weight of the tea leaves was used as the extraction solvent. After extraction with hot water at 55 ° C. for 7 minutes, the tea leaves were separated, and further centrifuged to remove solid components such as coarse crushed tea tissue and tea particles to obtain an extract A.
- the extract A was diluted so that the amino acid content was 75 ppm (Comparative Example 1).
- furaneol purity 95% or more
- L-ascorbic acid and sodium bicarbonate were added to adjust the pH to 6.7, and then sterilized at 125 ° C. for 7 minutes.
- the green tea beverage of the present invention (the products of the present invention 1 to 3) was obtained.
- the content of furaneol, pyrazines, amino acids, caffeine and catechin in the obtained green tea beverage was measured, and sensory evaluation was performed.
- the sensory evaluation is 6 levels (5 points; feels extremely strong, 4 points; feels strongly, 3 points; feels, 2 points; feels slightly, 1) Score: slightly felt, 0 point; not felt at all), and the average score was calculated.
- Example 2 Furaneol-added tea beverage (2) Using the tea extract A obtained in Example 1, the amino acid content was diluted to 40 ppm, and furaneol was added to the concentration shown in Table 2 in the same manner as in Example 1 (Comparative Example 3). To this, furaneol was added to the concentration shown in Table 2 in the same manner as in Example 1, L-ascorbic acid and sodium bicarbonate were added to adjust the pH to 6.7, and then sterilized at 125 ° C. for 7 minutes. As a result, the green tea beverage of the present invention was obtained (Product 4 of the present invention).
- a tea beverage was prepared by diluting the extract A of Example 1 so that the amino acid content was 20 ppm, and adding the amino acid-containing tea extract to the ingredients shown in Table 2. . That is, green tea leaves (heating degree: weak) are sealed in a column type extractor, and 25 ° C. water is passed through to obtain a low temperature extract (a), and then 75 ° C. hot water is passed through this extraction residue.
- an enzyme reaction solution (c) by mixing the extracted residue with an enzyme (protease and pectinase), and mixing the whole amount of (a) and (c) above to obtain an amino acid Containing tea extract (Brix0.8) was obtained, and this was mixed with a dilute solution in which the extract A of Example 1 was adjusted to have an amino acid content of 20 ppm to obtain a tea beverage of Comparative Example 2 in Table 2. .
- Comparative Examples 2 to 4 after pH adjustment and sterilization in the same manner as in Example 1, analysis and sensory evaluation of various components of the product 4 and Comparative Examples 2 to 4 in the same manner as in Example 1 Went.
- the results are shown in Table 2.
- the tea beverage (invention product 4) adjusted so that the amount of furaneol was 50 ppb or more and caffeine was 200 ppm was reduced in heat-deteriorating odor and had a rich and savory flavor.
- the tea-drink (Comparative Example 4) in which caffeine is less than 150 ppm was not effectively relieved of the heat-degraded odor even when furaneol was blended at 50 ppb or more.
- a furaneol-containing tea extract (Brix 8.4, furaneol content; 6 ppm) was prepared by the following method.
- the roasted tea in which the fall / winter hereha was ignited with high heat, was subjected to steam distillation at SV (space velocity) 50 h ⁇ 1 under normal pressure to obtain a distillate.
- SV space velocity
- tea leaves were extracted, and this extract was subjected to activated carbon treatment.
- the activated carbon was separated and clarified by centrifugation and filtration, and concentrated under reduced pressure.
- the above distillate and concentrated liquid were blended, and the resulting extract was 80 ° C. ⁇ 30 sec. Was sterilized by heating to obtain a furaneol-containing tea extract.
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Abstract
Description
1.加熱殺菌して製造される容器詰茶飲料であって、以下(a)~(c)を含有する茶飲料:
(a)アミノ酸 40ppm以上
(b)カフェイン 150ppm以上
(c)フラネオール 50ppb以上。
2.さらに(d)ピラジン類を含有し、フラネオールのピラジン類に対する割合((c)/(d))が2.0以上である、上記1に記載の茶飲料。
3.カテキン類の含量が600ppm以下である、上記1又は2に記載の茶飲料。
4.フラネオール及び/又はピラジン類が、茶葉の抽出物として添加されたものである、上記1~3のいずれかに記載の茶飲料。
5.アミノ酸を40ppm以上含有し、かつ加熱殺菌して製造される容器詰茶飲料の加熱劣化臭を緩和する方法であって、該飲料の加熱殺菌前に、該飲料中のカフェイン量を150ppm以上、及びフラネオール量を50ppb以上に調整することを含む、方法。
本発明の茶飲料の有効成分であるフラネオール(furaneol)とは、フィルメニッヒ社の商品名として知られる2,5-ジメチル-4-ヒドロキシ-3(2H)-フラノン(4-hydroxy-2,5-dimethyl-3(2H)-furanone)の呼称であり、下記式(1)
本発明の茶飲料は、さらにピラジン類を含有させることで、加熱劣化臭を効果的に緩和させることができる。ピラジン類とは、メチルピラジン、2,5-ジメチルピラジン、2,6-ジメチルピラジン、エチルピラジン、2,3-ジメチルピラジン、エチルメチルピラジン、3-エチル-2,5-ジメチルピラジンなどが知られている。ピラジン類は、通常、Camellia属(例えばC. sinensis、C. assamica、やぶきた種及びそれらの雑種)から得られる茎や茶葉で火入れ加工を施したものから抽出により得られる成分である。本明細書中では、前記の中より2,5-ジメチルピラジンと2,6-ジメチルピラジンの合計量をピラジン類(d)とする。
本発明の茶飲料は、40ppm以上(好ましくは45pppm以上、より好ましくは50ppm以上、特に好ましくは55ppm以上)という高濃度のアミノ酸を含有する。ここで、本明細書中でいうアミノ酸とは、アルギニン、リジン、ヒスチジン、フェニルアラニン、チロシン、ロイシン、イソロイシン、メチオニン、バリン、アラニン、グリシン、プロリン、グルタミン酸、セリン、スレオニン、アスパラギン酸、トリプトファン、シスチン及びテアニンの19種類のアミノ酸の総称であり、茶飲料中のアミノ酸含量とは、前記19種類のアミノ酸の合計量に基づいて定義される。本明細書中では茶飲料中のアミノ態窒素量を測定することで、茶飲料のアミノ酸含量を便宜的に求める。具体的な測定方法は、後述の実施例の欄で説明する。
分析にはAgilent Technologies社のTDU-GC/MSを用いた。香気成分の抽出・濃縮にはGERSTEL社のtwisterを使用した。試料5gに塩化ナトリウム1.5gを溶解させた後、twisterにて1時間撹拌して抽出した。成分の定量は標準添加法にて行った。標準試薬としては、東京化成工業株式会社 2,5-dimethyl-4-hydroxy-3(2H)-furanone及び、東京化成工業株式会社 2,5-dimethyl pyrazineを使用した。分析条件は以下のとおりである。
ガスクロマトグラフィー:Agilent Technologies 7890A GC System
検出器:Agilent Technologies 5975C inert XL MSD
カラム:HP-INNOWAX 10M, 0.2mm, 0.2um
キャリアーガス:ヘリウム1ml/min
温度条件:60℃(0.5min)→(24℃/min)→260℃(2min)。
試料となる茶飲料をフィルター(0.45μm)でろ過し、HPLC分析に供した。HPLCの分析条件は以下のとおりである。
分析装置:東ソー株式会社、TOSOH HPLCシステム LC8020 model II
[マルチステーション:LC-8020、ポンプ:CCMC-II、オートサンプラ:AS-8021、検出器:UV-8020、カラムオーブン:CO-8020、オンラインデガッサ:SD-8023]
分析条件:[カラム:TSKgel ODS-80TsQA、溶離液A:10%アセトニトリル/水 0.05%TFA、溶離液B:80%アセトニトリル/水 0.05%TFA、流速:1.0ml/min、温度40℃、検出:UV275nm]。
アミノ酸は、飲料中のアミノ態窒素を測定した。アミノ態窒素は、TNBS法(trinitro benzene sulfonic acid法)で測定した。まず、試料となる茶飲料に、リン酸緩衝溶液及び0.1% 2,4,6-Trinitro benzene sulfonic acid-Na塩水溶液を混合し、45℃で90分間反応させた後、蛍光強度(OD340nm)を測定した。グリシン標準液から検量線を作成し、試料中のアミノ態窒素の含有量をグリシン相当として算出した。
原料茶としてアミノ酸含量の高い一番茶かぶせ茶を用い、茶葉の乾燥重量に対して25倍量の水を抽出溶媒として用いた。55℃の温水で7分間抽出した後、茶葉を分離し、さらに遠心分離処理して粗大な粉砕茶組織や茶粒子などの固形分を除去して、抽出液Aを得た。
実施例1で得た茶抽出液Aを用い、アミノ酸含量が40ppmとなるように希釈し、実施例1と同様にフラネオールを表2の濃度となるように添加した(比較例3)。これに、実施例1と同様にフラネオールを表2の濃度となるように添加し、L-アスコルビン酸及び炭酸水素ナトリウムを添加してpHを6.7に調整した後、125℃×7分間殺菌することにより本発明の緑茶飲料を得た(本発明品4)。
実験例1と同様の方法で原料茶を抽出し、遠心分離処理して抽出液を得た後、L-アスコルビン酸及び炭酸水素ナトリウムを添加してpH6.7に調整した。これに以下の方法により調製したフラネオール含有茶抽出物を0.1%添加し、125℃×7分間殺菌することにより本発明の緑茶飲料(本発明品5)を得た。得られた緑茶飲料について、実施例1に記載の方法にしたがってフラネオール濃度、アミノ酸、カフェイン及びカテキン含有量を測定し、官能評価を行った。
Claims (5)
- 加熱殺菌して製造される容器詰茶飲料であって、以下(a)~(c)を含有する茶飲料:
(a)アミノ酸 40ppm以上
(b)カフェイン 150ppm以上
(c)フラネオール 50ppb以上。 - さらに(d)ピラジン類を含有し、フラネオールのピラジン類に対する割合((c)/(d))が2.0以上である、請求項1に記載の茶飲料。
- カテキン類の含量が600ppm以下である、請求項1又は2に記載の茶飲料。
- フラネオール及び/又はピラジン類が、茶葉の抽出物として添加されたものである、請求項1~3のいずれかに記載の茶飲料。
- アミノ酸を40ppm以上含有し、かつ加熱殺菌して製造される容器詰茶飲料の加熱劣化臭を緩和する方法であって、該飲料の加熱殺菌前に、該飲料中のカフェイン量を150ppm以上、及びフラネオール量を50ppb以上に調整することを含む、方法。
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EP10828348.2A EP2499920B1 (en) | 2009-11-09 | 2010-11-05 | Tea beverage containing amino acid at high concentration |
AU2010316231A AU2010316231B2 (en) | 2009-11-09 | 2010-11-05 | Tea beverage containing amino acid at high concentration |
US13/505,772 US20120315368A1 (en) | 2009-11-09 | 2010-11-05 | Tea beverage containing amino acid at high concentration |
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EP (1) | EP2499920B1 (ja) |
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JP2011097905A (ja) | 2011-05-19 |
EP2499920A1 (en) | 2012-09-19 |
EP2499920A4 (en) | 2017-06-21 |
AU2010316231B2 (en) | 2015-01-22 |
AU2010316231A1 (en) | 2012-07-05 |
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US20120315368A1 (en) | 2012-12-13 |
EP2499920B1 (en) | 2018-10-10 |
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