JP6679833B2 - Starch manufacturing method - Google Patents

Starch manufacturing method Download PDF

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JP6679833B2
JP6679833B2 JP2015069215A JP2015069215A JP6679833B2 JP 6679833 B2 JP6679833 B2 JP 6679833B2 JP 2015069215 A JP2015069215 A JP 2015069215A JP 2015069215 A JP2015069215 A JP 2015069215A JP 6679833 B2 JP6679833 B2 JP 6679833B2
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starch
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mung bean
pea
beans
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将宏 杉山
将宏 杉山
吉田 隆治
隆治 吉田
中村 彰宏
彰宏 中村
貴康 本山
貴康 本山
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Fuji Oil Co Ltd
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Description

本発明は、老化が抑制された豆類澱粉に関する。   TECHNICAL FIELD The present invention relates to legume starch whose aging is suppressed.

澱粉は汎用的な食材として広く用いられている。澱粉を水系にて加熱することで生じる澱粉ゲルは、経時的に固化することが良く知られているが、これは澱粉の老化と言われ、アミロースの再結晶化により起こる。澱粉の老化は食品の保存性に強い影響を与える為に、従来より種々の老化防止方法が検討されてきた。   Starch is widely used as a general-purpose foodstuff. It is well known that a starch gel produced by heating starch in an aqueous system solidifies with time. This is called aging of starch and is caused by recrystallization of amylose. Since the aging of starch has a strong influence on the storability of foods, various methods for preventing aging have hitherto been studied.

特定の老化抑制剤を澱粉ゲル中に添加する手法は、過去より多くの開示がある。特許文献1はデキストランを、特許文献2はトレハロースを、それぞれ澱粉液や澱粉食品に添加することで、これらの澱粉の老化抑制を行う為の老化抑制剤として開示している。しかし、副原料としての表示等が必要となる。   There are more disclosures than before regarding the approach of adding specific aging inhibitors into starch gels. Patent Document 1 discloses dextran, and Patent Document 2 discloses trehalose as an aging inhibitor for suppressing aging of these starches by adding them to a starch solution or a starch food, respectively. However, labeling as an auxiliary material is required.

一方、澱粉自体を改変する方法も知られている。特許文献3は、酸の存在下に澱粉と果糖を加熱することで調製された、耐老化性澱粉が開示されている。しかし、加工澱粉の範疇に入り、食品としての使用には制限がある。特許文献4は、種々の酵素で糯米を低温処理することで調製された、餅澱粉の老化防止法が開示されている。しかし、範囲の狭い温度域で、数日にも渡る処理が必要であり、実用性にはまだ欠けるところがある。   On the other hand, a method of modifying starch itself is also known. Patent Document 3 discloses an aging-resistant starch prepared by heating starch and fructose in the presence of an acid. However, it falls into the category of processed starch, and its use as food is limited. Patent Document 4 discloses a method for preventing the aging of rice cake starch prepared by low-temperature treatment of glutinous rice with various enzymes. However, it requires a treatment for several days in a narrow temperature range, and is still lacking in practicality.

特開平3-258884号公報JP-A-3-258884 特開平08-242784号公報Japanese Patent Laid-Open No. 08-242784 特開平09-278802号公報Japanese Patent Laid-Open No. 09-278802 特開平10-323163号公報JP 10-323163 A

エンドウ等の豆類に由来する澱粉は、アミロース含量が高く、高いゲル化力を保つ一方、老化し易いという問題を持っている。本発明の目的は、添加物を使用することなく、老化が抑制された豆類澱粉を提供することにある。   Starch derived from beans such as peas has a high amylose content and maintains a high gelling power, but has a problem that it easily ages. It is an object of the present invention to provide legume starch with suppressed aging without the use of additives.

本発明者らは、上記の課題に対して鋭意研究を重ねた結果、豆類より乾式分級により調製した粗澱粉粒を原料に、更に水洗により精製した澱粉粒について、糊化時に老化の進行が抑えられる性質を有することを見出し、本発明を完成させた。   As a result of intensive studies on the above problems, the inventors of the present invention have suppressed the progress of aging during gelatinization with respect to starch granules prepared by dry classification from beans as raw materials and further purified by washing with water. They have found that they have the following properties, and have completed the present invention.

即ち、本発明は、
(1)豆類を乾式粉砕後に分級して得られる、乾物中の蛋白質含量が20重量%以下の豆類澱粉濃縮物から、水系下で澱粉を精製する、豆類澱粉の製造方法、
(2)豆類澱粉濃縮物が、空気分級によって調製されたものである、(1)に記載の、豆類澱粉の製造方法、
(3)豆類澱粉濃縮物のメジアン径が、10μm〜40μmである、(1)に記載の、豆類澱粉の製造方法、
(4)豆類澱粉が、緑豆またはエンドウに由来するものである、(1)乃至(3)何れか1つに記載の、豆類澱粉の製造方法、
である。
That is, the present invention
(1) A method for producing a bean starch, which comprises purifying starch in an aqueous system from a bean starch concentrate having a protein content of 20% by weight or less in a dry matter, which is obtained by classifying beans after dry pulverization,
(2) The method for producing legume starch according to (1), wherein the legume starch concentrate is prepared by air classification.
(3) The method for producing legume starch according to (1), wherein the legume starch concentrate has a median diameter of 10 μm to 40 μm.
(4) The method for producing legume starch according to any one of (1) to (3), wherein the legume starch is derived from mung bean or pea.
Is.

本発明によれば、糊化時に老化の進行が抑えられる性質を有した、豆類澱粉を得ることができる。   ADVANTAGE OF THE INVENTION According to this invention, the legume starch which has the property of suppressing progress of aging at the time of gelatinization can be obtained.

本発明品である(A)緑豆澱粉(乾式)および、通常品である(B)緑豆澱粉(湿式)を用いた、RVA(Rapid Viscosity Analyzer)の粘度変化グラフである。FIG. 3 is a viscosity change graph of RVA (Rapid Viscosity Analyzer) using (A) mung bean starch (dry type) which is a product of the present invention and (B) mung bean starch (wet type) which is a normal product. 本発明品である(A)緑豆澱粉(乾式)および(C)エンドウ澱粉(乾式)、並びに、通常品である(B)緑豆澱粉(湿式)および(D)エンドウ澱粉(湿式)を用いた、離水率の経日変化を示すグラフである。Using (A) mung bean starch (dry type) and (C) pea starch (dry type) which are products of the present invention, and (B) mung bean starch (wet type) and (D) pea starch (wet type) which are ordinary products, It is a graph which shows the daily change of a water separation rate.

(豆類)
本発明で用いる豆類とは、澱粉を主たる構成成分とする豆類である。例示すれば、エンドウ,緑豆,アズキ,ササゲ,インゲン,ソラマメ,レンズマメ,ヒヨコマメ,ルピン等が挙げられる。中でも、エンドウおよび緑豆は、その含有する澱粉が強いゲル化力を示す為に好ましく、特に強いゲル化力を示す緑豆は、最も好ましい。これら豆類について、後述する乾式粉砕を行った後に、澱粉画分を濃縮する。澱粉への不純物混入を避けるためには、粉砕前に、豆類の外皮は予め除いた方が好ましい。
(beans)
The beans used in the present invention are beans whose main constituent is starch. Examples include peas, green beans, adzuki beans, cowpeas, green beans, broad beans, lentils, chickpeas, lupins, and the like. Among them, pea and mung beans are preferable because the starch contained therein exhibits a strong gelling power, and mung beans showing a particularly strong gelling power are most preferable. These beans are subjected to dry pulverization described below, and then the starch fraction is concentrated. In order to avoid contamination of the starch with impurities, it is preferable to remove the hulls of the beans before crushing.

緑豆とは、マメ科ササゲ属である、ヤエナリ(八重生)(Vigna radiata)の種子である。青小豆(あおあずき)、文豆(ぶんどう)と呼称されることもある。また、エンドウとはマメ科エンドウ属である植物またはその種子であるが、本発明ではエンドウ種子をエンドウと定義する。サヤエンドウやグリーンピースと同じ植物に由来する。   Mung bean is a seed of Vigna radiata, which is a leguminous cowpea genus. It is also called Ao Azuki or Bundou. Moreover, pea is a plant of the genus Pea of the family of the legume or its seeds, and in the present invention, pea seeds are defined as pea. It is derived from the same plant as green peas and green peas.

(乾式粉砕)
本発明は豆類の乾式粉砕物を使用することを特徴とする。乾式粉砕とは、例えばフレーククラッシャー,ハンマーミル,ピンミル,ブレードミル,ボールミル,スタンプミル,バンタムミル,ジェットミル,サイクロンミル,フレットミル,パンミル,エッジランナー,ローラーミル,ミックスマーラー,振動ミルなどの乾式粉砕機を用いて、豆類を粉砕することである。そして、破砕およびその前後の工程に於いて、積極的な水の介在なく処理を行うことが特徴である。水を用いると豆細胞組織中のプロテインボディが吸水し、この後の分画作業が困難になる場合がある。好ましい乾式粉砕機として、株式会社セイシン企業のジェットミルやインペラミル、アルピネ社のピンミル等を用いることができる。
(Dry grinding)
The present invention is characterized by using a dry pulverized product of pulses. Dry grinding is, for example, dry grinding of flake crusher, hammer mill, pin mill, blade mill, ball mill, stamp mill, bantam mill, jet mill, cyclone mill, fret mill, pan mill, edge runner, roller mill, mix muller, vibration mill, etc. It is to crush beans using a machine. The crushing process and the process before and after the crushing process are characterized by performing the treatment without the active intervention of water. When water is used, the protein body in the bean cell tissue absorbs water, which may make the subsequent fractionation work difficult. As a preferable dry crusher, a jet mill or impeller mill manufactured by Seishin Co., Ltd., a pin mill manufactured by Alpine Company, or the like can be used.

豆類の乾式粉砕物は粒子径により組成が異なる。粒子径の小さい画分、すなわち微粉側に蛋白質がより多く含まれる。例えば緑豆の場合、破砕後分級前粉砕物の粒度分布において50μm以下の画分が体積基準で好ましくは55%以上、より好ましくは90%以上となるように粉砕することで、後述する分級によって蛋白質濃度の高い緑豆蛋白質濃縮物を効率的に排除することができる。
なお、粒子径分布およびメジアン径はLMS-2000e (株式会社セイシン企業製)、SALD-2300(株式会社島津製作所製)などのレーザー回折式粒度分布測定装置を用いて、測定媒液を2-プロパノールで測定することができる。測定の際は、試料を少量の溶媒中でボルテックスミキサーなどで十分分散させてから測定する。
The composition of dry pulverized beans is different depending on the particle size. A larger amount of protein is contained in the fraction having a smaller particle size, that is, the fine powder side. For example, in the case of mung beans, the fraction of 50 μm or less in the particle size distribution of the crushed product after crushing before classification is preferably 55% or more on a volume basis, and more preferably 90% or more, by crushing so that the protein by classification described below. High-concentration mung bean protein concentrate can be eliminated efficiently.
The particle size distribution and median size can be measured by using a laser diffraction particle size distribution analyzer such as LMS-2000e (manufactured by Seishin Enterprise Co., Ltd.) or SALD-2300 (manufactured by Shimadzu Corporation). Can be measured at. When measuring, disperse the sample in a small amount of solvent with a vortex mixer or the like before measuring.

(分級)
続いて微粉側の画分を分離除去することで、蛋白質含量が低く、澱粉含量の高い画分を得る。当該画分の体積基準の粒径(メジアン径)は、10μm以上が好ましく、12μm以上が更に好ましい。また、40μm以下が好ましく、35μm以下が更に好ましい。分離手段としてはプロテインボディからの蛋白質の溶出を避けるため、乾式分級を用いることが好ましい。乾式分級を行う好ましい装置としては、振動篩等の篩、並びに、重力式分級機、遠心分級機、および慣性分級機等の流体分級機が挙げられる。分級する粒度、処理速度等を考慮し、適宜選択することができる。
(Classification)
Then, the fraction on the fine powder side is separated and removed to obtain a fraction having a low protein content and a high starch content. The volume-based particle diameter (median diameter) of the fraction is preferably 10 μm or more, more preferably 12 μm or more. Further, it is preferably 40 μm or less, more preferably 35 μm or less. As a separating means, it is preferable to use dry classification in order to avoid elution of the protein from the protein body. Preferred devices for performing dry classification include sieves such as vibrating screens, and fluid classifiers such as gravity classifiers, centrifugal classifiers, and inertial classifiers. It can be appropriately selected in consideration of the particle size to be classified, the processing speed, and the like.

(空気分級)
乾式分級は乾式の流体分級すなわち、空気分級が好ましい。空気分級は、気流分級や風力分級とも呼ばれ、流体中での固体粒子の沈降速度が粒子の大きさによって異なることを利用して、細かい粉体を分画する方法で、高い分画精度で大量の製品を処理できるという特徴を有する。特に自由渦型,半自由渦型または回転羽型等の遠心分級機が好ましく、装置として、株式会社セイシン企業のクラッシールやアルピネ社のミクロプレックス等が挙げられる。
(Air classification)
The dry classification is preferably dry fluid classification, that is, air classification. Air classification is also called airflow classification or wind classification, and it takes advantage of the fact that the sedimentation velocity of solid particles in a fluid varies depending on the size of the particles, and is a method of fractionating fine powder with high fractionation accuracy. It has the feature that it can process a large amount of products. In particular, a centrifugal classifier such as a free vortex type, a semi-free vortex type, or a rotary vane type is preferable, and examples of the apparatus include Clasir of Seishin Co., Ltd. and Microplex of Alpine Company.

(豆類澱粉濃縮物)
豆類澱粉濃縮物は、特定画分の分離により、乾物中の蛋白質含量を20重量%以下として、澱粉成分を濃縮したものである。また、乾物中の蛋白質含量は15重量%以下が好ましい。蛋白質含量が高いと、本発明の効果である澱粉の老化抑制能の発現が低いことがある。
(Beans starch concentrate)
The legume starch concentrate is obtained by separating the specific fraction so that the protein content in the dry matter is 20% by weight or less and the starch component is concentrated. The protein content in the dry matter is preferably 15% by weight or less. When the protein content is high, the effect of the present invention may be low in the ability of starch to suppress aging.

(豆類澱粉)
上記の豆類澱粉濃縮物は、更に水系下で蛋白質、繊維、塩類等を分離し、澱粉を精製することで、豆類澱粉を調製することができる。すなわち、豆類澱粉濃縮物の1重量倍以上の加水を行い、蛋白質,繊維および塩類を、水相に溶解または分散させる。続けて、系中に分散または沈殿している澱粉を回収する。回収には種々の方法を用いることができるが、遠心分離機,液体サイクロン,メッシュ等々の機器を使用できる。
分離回収した澱粉は、蛋白質含量8重量%以下に精製されたものである。そのまま使用しても良いし、更に加水し、上記の分離操作、すなわち洗浄を繰り返すこともできる。繰り返すことにより、澱粉の純度が向上し、悪風味等の低減や、ゲル化力の向上が期待できる。
本発明の豆類澱粉のように、豆類原料の乾式粉砕物を空気分級することにより得られる澱粉濃縮物から澱粉を湿式で分離する方法で得られたものの方が、該粉砕物から湿式で調製する方法で得られるものよりも老化抑制能が優れている。
(Bean starch)
The beans starch concentrate can be prepared by further separating proteins, fibers, salts and the like in an aqueous system and purifying the starch to prepare beans starch. That is, the protein, fiber, and salt are dissolved or dispersed in the aqueous phase by adding water in an amount 1 time or more the weight of the legume starch concentrate. Subsequently, the starch dispersed or precipitated in the system is recovered. Although various methods can be used for recovery, equipment such as a centrifuge, a liquid cyclone, a mesh, etc. can be used.
The separated and recovered starch is purified to a protein content of 8% by weight or less. It may be used as it is, or it may be further hydrated and the above-mentioned separation operation, that is, washing may be repeated. By repeating the process, the purity of starch is improved, and it is expected that the malodor and the like are reduced and the gelling power is improved.
Like the legume starch of the present invention, the one obtained by a method of separating starch by a wet method from a starch concentrate obtained by air classification of a dry pulverized material of a legume raw material is prepared by a wet method from the pulverized material. The anti-aging ability is superior to that obtained by the method.

(蛋白質含量の定量方法)
本発明における豆類澱粉中の蛋白質含量は、ケルダール法により測定される粗蛋白質量をもって蛋白質含量とする。但し、窒素係数は5.7を用いる。
(Method for quantifying protein content)
The protein content in the legume starch in the present invention is defined as the protein content based on the crude protein amount measured by the Kjeldahl method. However, a nitrogen coefficient of 5.7 is used.

(澱粉含量の定量方法)
本発明では、豆類由来の澱粉含量は、日本バイオコン株式会社の総澱粉量測定キットを用いて以下の様に測定する。
以下の測定方法は総澱粉含量測定キット(Lot 131201−1)を用いた場合の方法である。
試料を測定する際はキットに付属のコーンスターチスタンダードも同時に測定し、算出された澱粉含量が表示の澱粉濃度と比較して大幅に異ならないことを確認する。
キットに添付されている手順書には複数の測定方法が示されているが、そのうち以下の方法で測定を行う。0.5mmのスクリーンを通過した試料を試験管に100mg計量し、5mLの80%(v/v)エタノールに懸濁後、80−85℃で5分間加熱する。その後ボルテックスミキサーで撹拌し、さらに5mLの80%(v/v)エタノールを添加し、1,800×gで10分間遠心後、上清を廃棄する。沈殿は10mLの80%(v/v)エタノールに再懸濁し、1,800×gで10分間遠心分離後、上清を廃棄する。沈殿に2mLの2M KOHを添加し、氷水中に試験管を入れて20分間スターラー撹拌する。20分後、8mLの1.2M 酢酸ナトリウムバッファー(pH3.8)を添加してスターラー撹拌し、直ちにキット添付のα―アミラーゼ及びAMG(アミログルコシダーゼ)を各0.1mL添加して混合して50℃のウォーターバスで30分間加温する。30分の加温の間は5分毎にボルテックスミキサーで撹拌する。その後、試料中に澱粉含量が10%以上含まれる場合は、100mLのメスフラスコを使用して蒸留水でメスアップし、1,800×gで10分間遠心分離した上清をGOPOD(グルコースオキシダーゼ/ペルオキシダーゼ)を基質とした反応に使用する。試料中の澱粉含量が10%未満の場合は、上記の50℃で30分間加温した溶液を1,800×gで10分間遠心分離した上清をGOPODを基質とした反応に使用する。 上記の方法はキットに添付の手順書にあるexample(e)のStep5まで行った後に、example(c)のStep4からStep8まで行い、example(a)のStep7以降の処理をする方法である。
(Quantification method of starch content)
In the present invention, the starch content derived from beans is measured as follows using a total starch amount measuring kit of Nippon Biocon Co., Ltd.
The following measuring method is a method using a total starch content measuring kit (Lot 131201-1).
When measuring the sample, also measure the cornstarch standard included in the kit at the same time to ensure that the calculated starch content does not differ significantly from the indicated starch concentration.
The procedure manual attached to the kit shows multiple measurement methods. Of these, the following methods are used for measurement. 100 mg of the sample passing through the 0.5 mm screen is weighed in a test tube, suspended in 5 mL of 80% (v / v) ethanol, and then heated at 80-85 ° C. for 5 minutes. After that, the mixture is stirred with a vortex mixer, 5 mL of 80% (v / v) ethanol is further added, the mixture is centrifuged at 1,800 × g for 10 minutes, and the supernatant is discarded. The precipitate is resuspended in 10 mL of 80% (v / v) ethanol, centrifuged at 1,800 xg for 10 minutes, and the supernatant is discarded. Add 2 mL of 2M KOH to the precipitate, place the test tube in ice water and stir for 20 minutes. After 20 minutes, 8 mL of 1.2 M sodium acetate buffer (pH 3.8) was added, and the mixture was stirred with a stirrer. Immediately, 0.1 mL of each of α-amylase and AMG (amyloglucosidase) attached to the kit were added and mixed to obtain 50. Heat in a water bath at ℃ for 30 minutes. Stir with a vortex mixer every 5 minutes for 30 minutes of warming. Then, when the starch content is 10% or more in the sample, a 100 mL measuring flask is used to make up the volume with distilled water, and the supernatant obtained by centrifugation at 1,800 xg for 10 minutes is GOPOD (glucose oxidase / Peroxidase) as a substrate. When the starch content in the sample is less than 10%, the above solution heated at 50 ° C. for 30 minutes and centrifuged at 1800 × g for 10 minutes is used for the reaction using GOPOD as a substrate. The above method is a method in which after performing Step 5 of example (e) in the procedure manual attached to the kit, performing Step 4 to Step 8 of example (c) and performing Step 7 and subsequent steps of example (a).

(用途)
本発明の豆類澱粉は、コーンや馬鈴薯等の澱粉よりアミロース含量が高く、高いゲル化力を保つ一方、老化しにくい性質も併せ持つ。従って、種々の食品に使用できる。例示すれば、麺類,麺皮類, 和・洋菓子類,パン類,春雨等々に好適である。
その際の使用量としては、最終製品に対し5重量%〜100重量%程度を使用することが好ましい。
(Use)
The legume starch of the present invention has a higher amylose content than starches such as corn and potato, and while maintaining a high gelling power, also has a property of being resistant to aging. Therefore, it can be used for various foods. For example, it is suitable for noodles, noodle skins, Japanese and Western confectioneries, breads, vermicelli, and the like.
In that case, it is preferable to use about 5% to 100% by weight of the final product.

以下に実施例を記載することで本発明を説明する。   The present invention will be described by describing examples below.

(製造例1)緑豆粉および緑豆澱粉濃縮物の調製(乾式粉砕・分級)
脱皮緑豆を立型グラインダ(サワーボーイNSG-15F、株式会社長沢機械製作所製)で粉砕し、JIS試験篩い16メッシュを通して、50μm以下の画分が体積基準で42%の予備粉砕物を得た。予備粉砕物はさらにジェットミル(シングルトラック・ジェットミルFS-4、株式会社セイシン企業製)で粉砕し、緑豆粉とした(圧力0.5MPa)。緑豆粉の蛋白質含量は29.5重量%、メジアン径8.2μm、50μm以下の画分が体積基準で99%であった。
(Production Example 1) Preparation of mung bean powder and mung bean starch concentrate (dry pulverization / classification)
The dehulled mung bean was crushed with a vertical grinder (Sourboy NSG-15F, manufactured by Nagasawa Kikai Seisakusho Co., Ltd.) and passed through a JIS test sieve 16 mesh to obtain a preliminary crushed product in which a fraction of 50 μm or less was 42% on a volume basis. The preliminary crushed product was further crushed with a jet mill (single-track jet mill FS-4, manufactured by Seishin Enterprise Co., Ltd.) to obtain mung bean powder (pressure 0.5 MPa). The protein content of mung bean flour was 29.5% by weight, and the fraction with a median diameter of 8.2 μm and 50 μm or less was 99% by volume.

ジェットミルで得られた緑豆粉は気流分級機(クラッシールN-01、株式会社セイシン企業)を用いて空気分級した(ローター回転数5,000rpm)。分級の結果得られた粗粉側の蛋白質含量は13%,澱粉含量は69%,メジアン径は15μmであった。これを緑豆澱粉濃縮物(乾式)とした。   The mung bean powder obtained by the jet mill was air-classified (rotor speed: 5,000 rpm) using an airflow classifier (Crasseel N-01, Seishin Enterprise Co., Ltd.). As a result of classification, the protein content on the coarse powder side was 13%, the starch content was 69%, and the median diameter was 15 μm. This was designated as a mung bean starch concentrate (dry type).

(製造例2)緑豆澱粉(乾式)の調製
緑豆澱粉濃縮物(乾式)に対し10重量倍の加水を行い、5分間攪拌した後、目開き90μmのメッシュで繊維を分離し、澱粉を含む透過液を得た。その後、遠心分離機(日立工機株式社製CR22G III)で210×g、10分間の条件にて澱粉粒を分離した。得られた澱粉粒の湿重量に対して5重量倍の加水を行い、5分間攪拌した後、再度遠心分離にて澱粉粒を分離した。更にもう1度加水と分離を繰り返し、澱粉粒を単離した。これを緑豆澱粉(乾式)とした。緑豆澱粉(乾式)の澱粉含量は95重量%だった。
(Production Example 2) Preparation of Mung Bean Starch (Dry Type) 10 times by weight of water was added to the Mung Bean Starch Concentrate (Dry Type), and the mixture was stirred for 5 minutes, and then the fibers were separated with a mesh having an opening of 90 μm, and the permeation containing the starch was conducted. A liquid was obtained. Then, the starch particles were separated by a centrifuge (CR22G III manufactured by Hitachi Koki Co., Ltd.) under the conditions of 210 × g for 10 minutes. Water was added in an amount of 5 times the wet weight of the obtained starch granules, stirred for 5 minutes, and then centrifuged again to separate the starch granules. The starch particles were isolated by repeating water addition and separation once more. This was designated as mung bean starch (dry type). The starch content of the mung bean starch (dry type) was 95% by weight.

(製造例3)緑豆澱粉(湿式)の調製
製造例1で調製した緑豆粉に対して2重量倍の加水を行い、5分間攪拌した後、スラリーを濾布で繊維と澱粉汁とに分離した。澱粉汁は更に遠心分離機(日立工機株式社製CR22G III)で210×g、10分間の条件にて澱粉粒を分離した。得られた澱粉粒の湿重量に対して5重量倍の加水をし、5分間攪拌した後、再度遠心分離にて澱粉粒を分離した。更にもう1度加水と分離を繰り返し、澱粉粒を単離した。これを緑豆澱粉(湿式)とした。緑豆澱粉(湿式)の澱粉含量は95重量%だった。
(Production Example 3) Preparation of mung bean starch (wet type) 2 times by weight of water was added to the mung bean flour prepared in Production Example 1, stirred for 5 minutes, and then the slurry was separated into fibers and starch juice with a filter cloth. . The starch juice was further separated into starch granules by a centrifuge (CR22G III manufactured by Hitachi Koki Co., Ltd.) under the conditions of 210 × g for 10 minutes. Water was added in an amount of 5 times the wet weight of the obtained starch granules, the mixture was stirred for 5 minutes, and then the starch granules were separated again by centrifugation. The starch particles were isolated by repeating water addition and separation once more. This was designated as mung bean starch (wet type). The starch content of mung bean starch (wet type) was 95% by weight.

(製造例4)エンドウ粉およびエンドウ澱粉濃縮物の調製(乾式粉砕・分級)
緑豆の代わりにエンドウを用いて、製造例1と同様の操作でエンドウ粉、およびエンドウ澱粉濃縮物(乾式)を調製した。エンドウ粉の蛋白質含量は25%、メジアン径32μm、50μm以下の画分が体積基準で60%であった。また粗粉側であるエンドウ澱粉濃縮物(乾式)の蛋白質含量は7.7%,澱粉含量は71%,メジアン径は38μmであった。
(Production Example 4) Preparation of pea flour and pea starch concentrate (dry pulverization / classification)
Using pea instead of green beans, pea flour and a pea starch concentrate (dry type) were prepared in the same manner as in Production Example 1. The protein content of pea flour was 25%, and the fraction of median diameter 32 μm and 50 μm or less was 60% by volume. The pea starch concentrate (dry type) on the coarse powder side had a protein content of 7.7%, a starch content of 71% and a median diameter of 38 μm.

(製造例5)エンドウ澱粉(乾式)の調製
製造例4で調製したエンドウ粉を用い、製造例2と同様の操作でエンドウ澱粉(乾式)を調製した。エンドウ澱粉(乾式)の澱粉含量は94重量%だった。
(Production Example 5) Preparation of pea starch (dry type) Using the pea flour prepared in Production Example 4, pea starch (dry type) was prepared in the same manner as in Production Example 2. The starch content of the pea starch (dry type) was 94% by weight.

(製造例6)エンドウ澱粉(湿式)の調製
緑豆の代わりにエンドウを用いて、製造例1および製造例3と同様の操作で、エンドウ澱粉(湿式)を調製した。エンドウ澱粉(湿式)の澱粉含量は95重量%だった。
(Production Example 6) Preparation of pea starch (wet type) Pea starch (wet type) was prepared in the same manner as in Production Example 1 and Production Example 3 using pea instead of mung beans. The starch content of the pea starch (wet) was 95% by weight.

(実施例1)RVA
緑豆澱粉(乾式)、または緑豆澱粉(湿式)の10重量%水溶液について、RVA(Rapid Viscosity Analyzer,Newport Scientific社製,型式:RVA-4)にて分析を行った。尚、温度は30℃で1分間ホールドした後、30〜95℃まで 5℃/分で昇温し、95℃で6分間ホールドし, 95〜50℃まで 5℃/分で降温した後、50℃で10分間ホールドの条件で行った。
結果を図1に示した。本発明品の緑豆澱粉(乾式)は、従来品の緑豆澱粉(湿式)に比較して、最終粘度が低く、老化し難い性質を有していることが判った。
(Example 1) RVA
A 10% by weight aqueous solution of mung bean starch (dry type) or mung bean starch (wet type) was analyzed by RVA (Rapid Viscosity Analyzer, Newport Scientific, model: RVA-4). The temperature is held at 30 ° C for 1 minute, then raised from 30 to 95 ° C at 5 ° C / min, held at 95 ° C for 6 minutes, and lowered from 95 to 50 ° C at 5 ° C / min. It was carried out under the condition of hold at 10 ° C for 10 minutes.
The results are shown in Fig. 1. It was found that the mung bean starch (dry type) of the present invention product has a lower final viscosity and is less likely to age than the conventional mung bean starch (wet type).

(実施例2)離水率
緑豆澱粉(乾式)、緑豆澱粉(湿式)、エンドウ澱粉(乾式)およびエンドウ澱粉(湿式)について、各2gを50ml容コニカルチューブに採り、水20mlを加えて攪拌した。密栓後80℃で40分間振とう攪拌し、ゲルを得た。ゲルを室温に放冷後に上部に離水した水を除去した。そのまま5℃にて保管し、1,3,6,9,14,17日後の各時点にて、50×g、60分間の条件で遠心分離を行い得られた水層の重量を測定し、初発のゲル重量に対する離水率(%)とした。
(Example 2) Water separation rate 2 g of each of mung bean starch (dry type), mung bean starch (wet type), pea starch (dry type) and pea starch (wet type) was placed in a 50 ml conical tube, and 20 ml of water was added and stirred. After sealing, the mixture was shaken and stirred at 80 ° C. for 40 minutes to obtain a gel. After allowing the gel to cool to room temperature, the water that had separated above the water was removed. It is stored as it is at 5 ° C., and after 1, 3, 6, 9, 14, 17 days, it is centrifuged at 50 × g for 60 minutes, and the weight of the obtained aqueous layer is measured. The water separation rate (%) was calculated based on the initial gel weight.

結果を図2に示した。緑豆,エンドウ何れも、澱粉(乾式)の方が、澱粉(湿式)に比較して離水が少なく、老化が抑制されていることが判った。この差は緑豆で特に顕著だった。   The results are shown in Fig. 2. It was found that starch (dry type) produced less water separation than starch (wet type) and suppressed aging in both green beans and peas. This difference was especially noticeable in mung beans.

Claims (2)

緑豆またはエンドウに由来する豆類を乾式粉砕し、その後に空気分級して乾物中の蛋白質含量が20重量%以下の豆類澱粉濃縮物を得、そして、前記豆類澱粉濃縮物から、水系下で豆類澱粉を精製する、豆類澱粉の製造方法。 Beans derived from mung bean or pea dry milled and air classification after its obtain a protein content of 20 wt% or less of legumes starch concentrate in dry matter with, and from the legumes starch concentrate, legumes starch in an aqueous system A method for producing a legume starch, comprising: 豆類澱粉濃縮物のメジアン径が、10μm〜40μmである、請求項1に記載の、豆類澱粉の製造方法。 The method for producing legume starch according to claim 1, wherein the legume starch concentrate has a median diameter of 10 μm to 40 μm.
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