JP5485678B2 - Method for suppressing aggregation of powdered tea leaves - Google Patents
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- JP5485678B2 JP5485678B2 JP2009288761A JP2009288761A JP5485678B2 JP 5485678 B2 JP5485678 B2 JP 5485678B2 JP 2009288761 A JP2009288761 A JP 2009288761A JP 2009288761 A JP2009288761 A JP 2009288761A JP 5485678 B2 JP5485678 B2 JP 5485678B2
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Description
本発明は、茶葉を粉末状にした抹茶などの粉末茶葉の凝集抑制方法に関する。 The present invention relates to a method for suppressing aggregation of powdered tea leaves such as powdered green tea.
粉末茶葉は、茶葉を粉末状に粉砕したものであり、例えば、覆いをした茶園の若芽を蒸して揉まずに乾燥した碾茶を石臼などで挽いた抹茶等がある。粉末茶葉は、これに直接熱湯を注ぎ、茶筅で分散させて飲用されることが多いが、近年では、菓子やアイスクリームなどの飲食物に風味や色を付けるために用いられることもある。 Powdered tea leaves are obtained by pulverizing tea leaves into powder, for example, matcha tea obtained by steaming dried tea buds of a covered tea garden and grinding them with a stone mill. Powdered tea leaves are often used by pouring hot water directly onto them and dispersing them in a tea bowl, but in recent years, they are sometimes used to add flavor and color to foods and drinks such as confectionery and ice cream.
大量生産する飲食物に粉末茶葉を用いる場合は、当然大量の粉末茶葉を必要とするため、その場合、茶葉を粉砕するには石臼は大量生産に適してないため、ハンマーミル、ボールミルやジェットミルを用いることがある(例えば、下記非特許文献1〜4参照) When powdered tea leaves are used for mass-produced foods and drinks, naturally, a large amount of powdered tea leaves is required, and in that case, a millstone is not suitable for mass production in order to grind the tea leaves, so a hammer mill, ball mill or jet mill (For example, see Non-Patent Documents 1 to 4 below)
茶の粉砕は古来石臼によってなされてきた。近年,技術の進歩とともに同じように粉砕可能な設備が開発されている。ボールミルは,石臼と同じように粉砕することが可能であり,短時間に大量に粉砕するにはハンマーミルを用いることも可能である。特に、ジェットミルは、茶葉を細かく粉砕できるだけでなく円形度を高くすることもできる。
本発明者らは、これら粉末茶葉の物性について鋭意研究したところ、円形度の高い粉末茶葉は凝集しにくく、いわゆるダマになりにくいことを見出して本発明を想到したものである。
Tea has been crushed by ancient stone mills. In recent years, equipment that can be pulverized in the same way has been developed as technology advances. A ball mill can be crushed in the same way as a stone mill, and a hammer mill can be used for pulverizing a large amount in a short time. In particular, the jet mill can not only finely pulverize tea leaves but also increase the circularity.
The present inventors have intensively studied the physical properties of these powdered tea leaves, and found that powdered tea leaves having a high degree of circularity are less likely to agglomerate and less likely to become so-called lumps.
そこで、本発明の目的は、粉末茶葉を良好に分散させた飲食物及び粉末茶葉の凝集抑制方法を提供することにある。 Accordingly, an object of the present invention is to provide a food and drink in which powdered tea leaves are well dispersed and a method for suppressing aggregation of powdered tea leaves.
本発明の飲食物は、篩下累積粒度90%を10μm以下、メディアン径を3μm以下、平均円形度を0.9〜1.0に調整した粉末茶葉を添加したことを特徴とする。 The food and drink according to the present invention is characterized by adding powdered tea leaves having a 90% cumulative particle size of 10 µm or less, a median diameter of 3 µm or less, and an average circularity of 0.9 to 1.0.
上記粉末茶葉は、凝集しにくいものであり、このような粉末茶葉を添加した飲食物は、粉末茶葉が偏ることなく分散されているものである。 The above-mentioned powdered tea leaves are difficult to agglomerate, and the food and drink to which such powdered tea leaves are added are those in which the powdered tea leaves are dispersed without being biased.
以下、本発明の飲食物の一実施形態を説明する。但し、本発明は、この実施形態に限定されるものではない。 Hereinafter, an embodiment of the food and drink of the present invention will be described. However, the present invention is not limited to this embodiment.
本発明の一実施形態の飲食物は、篩下累積粒度90%を10μm以下、メディアン径を3μm以下、平均円形度を0.9〜1.0に調整した粉末茶葉を添加したことを特徴とするものである。 The food and drink of one embodiment of the present invention is characterized by adding powdered tea leaves in which 90% cumulative particle size under sieve is 10 μm or less, median diameter is 3 μm or less, and average circularity is adjusted to 0.9 to 1.0. To do.
本発明に用いる粉末茶葉は、茶葉を粉砕し乾燥させた粉末であり、不発酵茶,半発酵茶,発酵茶などを粉砕し乾燥させた粉末、或いはこれらを混合したものである。具体的には、抹茶などを挙げることができる。
粉末茶葉は、篩下累積粒度90%が10μm以下、好ましくは7μm以下、メディアン径(中位径)が5μm以下、好ましくは3μm以下、平均円形度が0.8〜1.0、好ましくは0.9〜1.0になるように調整してある。
The powdered tea leaves used in the present invention are powders obtained by pulverizing and drying tea leaves, and powders obtained by pulverizing and drying unfermented tea, semi-fermented tea, fermented tea, or the like, or a mixture thereof. Specific examples include matcha tea.
The powdered tea leaves have a 90% cumulative particle size of 10 µm or less, preferably 7 µm or less, a median diameter (median diameter) of 5 µm or less, preferably 3 µm or less, and an average circularity of 0.8 to 1.0, preferably 0. .9 to 1.0.
なお、篩下累積粒度90%は、レーザー回析散乱光式粒度分布測定装置を用いて体積基準で3回測定して平均値で表した粒度分布を用いて測定し、メディアン径は、該粒度分布の50%となる粒径とすることができる。レーザー回析散乱光式粒度分布装置としては、具体的には、島津製作所製SALD-2100などを用いることができる。
また、円形度とは、粉体の写真画像等から得られる2次元の面積に相当する円の円周を、その粉体の周囲長で除した値を示し、1に近いほど円に近い形状を示すものであり、具体的に、円形度は、乾式粒子像分析装置を用いて粉末茶葉粒子の面積及び周囲長を測定し、該面積と同じ面積の円の円周長を算出し、
円形度=粉末茶葉粒子の面積と同じ面積の円の円周長/粒子の周囲長
の式に基づいて算出することができる。乾式粒子像分析装置としては、具体的には、シメックス社製Morphologi G3などを用いることができる。
The 90% cumulative particle size under the sieve is measured using a particle size distribution expressed by an average value obtained by measuring three times on a volume basis using a laser diffraction / scattering light particle size distribution measuring device. The particle size can be 50% of the distribution. As the laser diffraction / scattering light particle size distribution device, specifically, SALD-2100 manufactured by Shimadzu Corporation can be used.
The circularity is a value obtained by dividing the circumference of a circle corresponding to a two-dimensional area obtained from a photographic image of the powder by the circumference of the powder. Specifically, the circularity is measured by measuring the area and circumference of the powdered tea leaf particles using a dry particle image analyzer, calculating the circumference of a circle having the same area as the area,
The degree of circularity can be calculated based on the formula of the circumference of a circle having the same area as the area of the powdered tea leaf particles / the circumference of the particles. As the dry particle image analyzer, specifically, Morphologi G3 manufactured by Simex Corporation can be used.
茶葉を粉砕して、篩下累積粒度90%、メディアン径、平均円形度を上記値に調整するには、ジェットミルを用いて行うことができ、噴射する空気の吐出圧力を0.8MPa以上、好ましくは0.9MPa以上にして行うのが好ましい。茶葉の滞留時間を長くすることにより細かく均一度が高くなる。また、吐出圧力を高めることにより円形度を高めることができる。吐出圧力を高めるには、0.8MPa以上の吐出圧力を有するエアコンプレッサを用いることにより行うことができる。
ジェットミルとしては、従来公知のものを用いることができ、具体的には、日本乾溜工業社製437型ジェットミルなどを用いることができる。
In order to pulverize the tea leaves and adjust the sieved cumulative particle size 90%, median diameter, and average circularity to the above values, it can be performed using a jet mill, and the discharge pressure of the sprayed air is 0.8 MPa or more, It is preferable to carry out at 0.9 MPa or more. By increasing the residence time of tea leaves, the uniformity becomes finer. Further, the circularity can be increased by increasing the discharge pressure. The discharge pressure can be increased by using an air compressor having a discharge pressure of 0.8 MPa or more.
As the jet mill, a conventionally known one can be used, and specifically, a 437 type jet mill manufactured by Nippon Kiboshi Kogyo Co., Ltd. can be used.
本発明の飲食物としては、粉末茶葉に直接熱湯や水を注いだ茶飲料を含み、粉末茶葉を、スポーツ飲料、果実飲料、乳飲料、野菜ジュース、乳性飲料、アルコール飲料、ゼリー、ゼリー飲料、炭酸飲料、チューインガム、チョコレート、キャンディ、ビスケット、スナック、パン、乳製品、魚肉練り製品、畜肉製品、冷菓、乾燥食品、サプリメントなどに添加したものを含む。飲食物中には、特に限定するものではないが、粉末茶葉を0.1〜10重量%、好ましくは0.2〜5重量%添加することができる。 The food and drink of the present invention includes tea beverages in which hot water or water is directly poured into powdered tea leaves, and powdered tea leaves are used as sports beverages, fruit beverages, milk beverages, vegetable juices, dairy beverages, alcoholic beverages, jelly, jelly beverages. , Carbonated beverages, chewing gum, chocolate, candy, biscuits, snacks, bread, dairy products, fish paste products, livestock meat products, frozen desserts, dried foods, supplements and the like. Although it does not specifically limit in food-drinks, 0.1-10 weight% of powdered tea leaves can be added, Preferably 0.2-5 weight% can be added.
これら飲食物を製造するには、例えば、これらの原料に粉末茶葉を混入して製造することができる。
粉末茶葉は、飲食物の原料に対して0.1〜10重量%、好ましくは0.2〜5重量%添加することができる。
In order to produce these foods and drinks, for example, powdered tea leaves can be mixed with these raw materials.
Powdered tea leaves can be added in an amount of 0.1 to 10% by weight, preferably 0.2 to 5% by weight, based on the raw material of the food and drink.
本発明で用いる粉末茶葉は、細かく、均一度が高く、円形に近いため、粉末茶葉同士が絡まりにくく凝集しにくいため、飲食物中で良好に分散されるものである。 The powdered tea leaves used in the present invention are fine, highly uniform, and close to a circle, so that the powdered tea leaves are not easily entangled and aggregated, so that they are well dispersed in food and drink.
以下、本発明の一実施例を説明する。但し、本発明は、この実施例に限定されるものではない。 An embodiment of the present invention will be described below. However, the present invention is not limited to this embodiment.
(実施例1)
摘採した一番茶を原料としてジェットミル(日本乾溜工業社製437型ジェットミル)で粉砕し、抹茶を製造した。
この際、原料は10kg/hrの割合でジェットミルに供給し、ジェットミルの吐出圧力は0.9MPaとした。
この抹茶の粒度分布を、レーザー回析散乱光式粒度分布測定装置(島津製作所製SALD-2100型)を用いて測定し、円形度を乾式粒子画像分析装置(シメックス社製Morphologi G3)で測定した。
その結果、メディアン径は2.9μm、篩下累積粒度90%は6.7μm、平均円形度は0.91であった。
この抹茶1gに直接80℃の熱湯50mlを注ぎ、茶筅で分散させた後、茶葉粉末が凝集してないか目視で観察したところ、凝集している茶葉粉末は観察されなかった。
Example 1
Matched tea was produced by pulverizing with the jet mill (a 437 type jet mill manufactured by Nihon Kiboshi Kogyo Co., Ltd.) using the picked first tea as a raw material.
At this time, the raw material was supplied to the jet mill at a rate of 10 kg / hr, and the discharge pressure of the jet mill was set to 0.9 MPa.
The particle size distribution of this matcha was measured using a laser diffraction / scattering light particle size distribution analyzer (SALD-2100, manufactured by Shimadzu Corporation), and the circularity was measured using a dry particle image analyzer (Simex Corp., Morphologi G3). .
As a result, the median diameter was 2.9 μm, the sieved cumulative particle size 90% was 6.7 μm, and the average circularity was 0.91.
When 50 ml of hot water at 80 ° C. was poured directly into 1 g of this matcha tea and dispersed in a tea bowl, it was visually observed whether the tea leaf powder was agglomerated, and no agglomerated tea leaf powder was observed.
(比較例1)
原料を15kg/hrの割合でジェットミルに供給した以外は、実施例1と同様に抹茶を製造した。
その結果、メディアン径は15.4μm、篩下累積粒度90%は40.9μm、平均円形度は0.80であった。
この抹茶1gに直接80℃の熱湯50mlを注ぎ、茶筅で分散させた後、茶葉粉末が凝集してないか目視で観察したところ、凝集している茶葉粉末が観察された。
(Comparative Example 1)
Matcha was produced in the same manner as in Example 1 except that the raw material was supplied to the jet mill at a rate of 15 kg / hr.
As a result, the median diameter was 15.4 μm, the 90% cumulative particle size under sieve was 40.9 μm, and the average circularity was 0.80.
When 50 ml of hot water at 80 ° C. was poured directly into 1 g of this matcha and dispersed in a tea bowl, it was visually observed whether the tea leaf powder was agglomerated. As a result, agglomerated tea leaf powder was observed.
(比較例2)
原料を25kg/hrの割合でジェットミルに供給した以外は、実施例1と同様に抹茶を製造した。
その結果、メディアン径は34.4μm、篩下累積粒度90%は147.7μm、平均円形度は0.80であった。
この抹茶1gに直接80℃の熱湯50mlを注ぎ、茶筅で分散させた後、茶葉粉末が凝集してないか目視で観察したところ、凝集している茶葉粉末が観察された。
(Comparative Example 2)
Matcha tea was produced in the same manner as in Example 1 except that the raw material was supplied to the jet mill at a rate of 25 kg / hr.
As a result, the median diameter was 34.4 μm, the sieved cumulative particle size 90% was 147.7 μm, and the average circularity was 0.80.
When 50 ml of hot water at 80 ° C. was poured directly into 1 g of this matcha and dispersed in a tea bowl, it was visually observed whether the tea leaf powder was agglomerated. As a result, agglomerated tea leaf powder was observed.
(比較例3)
摘採した一番茶を原料として石臼で挽き、抹茶を製造した。
この際、石臼は、直径35cm、上臼重量約20kg、電動回転式で回転数45rpmのものを用い、挽き量は、40〜50g/時間であった。
この抹茶の粒度分布を、レーザー回析散乱光式粒度分布測定装置(島津製作所製SALD-2100型)を用いて測定し、円形度を乾式粒子画像分析装置(シメックス社製Morphologi
G3)で測定した。
その結果、メディアン径は18.3μm、篩下累積粒度90%は75.1μm、平均円形度は0.84であった。
この抹茶1gに直接80℃の熱湯50mlを注ぎ、茶筅で分散させた後、茶葉粉末が凝集してないか目視で観察したところ、凝集している茶葉粉末が観察された。
(Comparative Example 3)
Green tea was produced by grinding the first tea, which was plucked, with a stone mill.
At this time, a stone mill having a diameter of 35 cm, an upper mill weight of about 20 kg, an electric rotary type and a rotation speed of 45 rpm was used, and a grinding amount was 40 to 50 g / hour.
The particle size distribution of this matcha was measured using a laser diffraction / scattering light particle size distribution analyzer (SALD-2100, manufactured by Shimadzu Corporation), and the circularity was measured using a dry particle image analyzer (Shimex, Morphologi).
G3).
As a result, the median diameter was 18.3 μm, the cumulative particle size under sieve was 90. 1 μm, and the average circularity was 0.84.
When 50 ml of hot water at 80 ° C. was poured directly into 1 g of this matcha and dispersed in a tea bowl, it was visually observed whether the tea leaf powder was agglomerated. As a result, agglomerated tea leaf powder was observed.
(比較例4)
摘採した一番茶を原料としてボールミル(マキノ社製BM-400)で粉砕し、抹茶を製造した。
この際、原料は200kgを投入した。
この抹茶の粒度分布を、レーザー回析散乱光式粒度分布測定装置(島津製作所製SALD-2100型)を用いて測定し、円形度を乾式粒子画像分析装置(シメックス社製Morphologi G3)で測定した。
その結果、メディアン径は17.5μm、篩下累積粒度90%は51.6μm、平均円形度は0.84であった。
この抹茶1gに直接80℃の熱湯50mlを注ぎ、茶筅で分散させた後、茶葉粉末が凝集してないか目視で観察したところ、凝集している茶葉粉末が観察された。
(Comparative Example 4)
Matched tea was produced by pulverizing it with a ball mill (BM-400 manufactured by Makino Co., Ltd.) using the first picked tea as a raw material.
At this time, 200 kg of raw material was charged.
The particle size distribution of this matcha was measured using a laser diffraction / scattering light particle size distribution analyzer (SALD-2100, manufactured by Shimadzu Corporation), and the circularity was measured using a dry particle image analyzer (Simex Corp., Morphologi G3). .
As a result, the median diameter was 17.5 μm, the cumulative particle size under sieve was 51.6 μm, and the average circularity was 0.84.
When 50 ml of hot water at 80 ° C. was poured directly into 1 g of this matcha and dispersed in a tea bowl, it was visually observed whether the tea leaf powder was agglomerated. As a result, agglomerated tea leaf powder was observed.
(結果)
茶葉をジェットミルで粉砕し、メディアン径は2.9μm、篩下累積粒度90%は6.7μm、平均円形度は0.91に調整した粉末茶葉は、熱湯を注いでも凝集することなく、良好に分散することが確認された。
これに対し、粒径が大きく、平均円形度が低いものは、凝集しやすく、分散しにくいことが確認された。
(result)
The tea leaves were pulverized with a jet mill, the median diameter was 2.9 μm, the sieved cumulative particle size 90% was 6.7 μm, and the average circularity was adjusted to 0.91. It was confirmed that it was dispersed.
On the other hand, it was confirmed that those having a large particle size and a low average circularity tend to aggregate and are difficult to disperse.
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