JP2009203229A - Method for processing rind of chestnut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a processed product of chestnut rinds excellent in extraction efficiency by processing them at a low pressure during the processing by an extruder. <P>SOLUTION: A method for processing chestnut rinds by processing a composition containing at least one of outer rinds and astringent rinds of chestnuts by a monoaxial or biaxial extruder to obtain the processed product of the chestnut rinds is provided. During processing by the extruder, the pressure acting onto the composition is 0-10 kg/cm<SP>2</SP>, the processing temperature of the composition is 80-130°C, and the water content of the composition is 30-50%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a component extraction method for chestnut skin constituting chestnut fruit, that is, one of pericarp (demon skin), seed coat (astringent skin), or a mixture thereof.

  Chestnut is a fruit of the beech family, and there are three kinds of varieties that are often cultivated around the world: Japanese chestnut, Chinese chestnut, and European chestnut. Chestnut skin is known to contain proanthocyanidins, catechins, and other polyphenols, and has long been used empirically as a medicinal plant, as seen in boiled astringent skin.

  However, the present situation is that most of the chestnut skin discharged when processing chestnuts harvested in various places is processed as waste.

  Conventionally, it has been reported that polyphenols contained in chestnut skin are extracted with water, a hydrophilic solvent, alcohol, or the like and exhibit an antioxidant ability effect or a blood glucose level increase inhibiting effect (for example, Patent Documents 1 to 5). reference).

JP 2004-189956 A JP 2004-352634 A JP 2006-104181 A JP 2006-131916 A JP, 2006-1872, A As a conventional extraction method of an active ingredient, a plant body containing a chestnut is crushed or ground in the shape of a chip or powder, and polar solvents, such as water, lower alcohol, and polyhydric alcohol, are used. Used to extract active ingredients.

  However, the conventional method has a limit in the extraction efficiency of the active ingredient contained in chestnut skin.

  Furthermore, the inventors' investigation shows that especially Japanese chestnut astringent skin contains a large amount of polyphenols, and in the conventional extraction method, many polyphenol components remain in the chestnut skin. Therefore, a method for efficiently extracting active ingredients from chestnut skin is desired.

  As a result of intensive studies to solve the above problems, the present inventors have succeeded in obtaining a processed chestnut skin product having excellent extraction efficiency.

In order to achieve the above object, the present invention provides, for example, the following means:
Item 1. A method for treating chestnut skin, wherein a composition comprising at least one chestnut skin of chestnut demon skin and chestnut astringent skin is processed by an extruder to obtain a processed chestnut skin, wherein the extruder processing, processing method of chestnut skin pressure acting on the composition is ^{0kg / cm 2 ~10kg / cm 2} .

  Item 2. Item 2. The method according to Item 1, wherein the processing temperature of the composition during extruder processing is 80 ° C to 130 ° C.

  Item 3. Item 3. The method according to Item 1 or 2, wherein the content of water contained in the composition during extruder processing is 30% to 50%.

  Item 4. 4. The method according to any one of items 1 to 3, wherein the processed chestnut skin is subjected to an enzyme treatment.

  Item 5. 4. The method according to any one of items 1 to 3, wherein the processed chestnut skin is subjected to a fermentation treatment.

  Item 6. The chestnut skin processed product according to items 1 to 5 is extracted with at least one extraction solvent selected from the group consisting of water, an aqueous alcohol solution, an alkaline aqueous solution, and an alkaline alcohol aqueous solution. Method.

Item 7. Adding 10 to 80 parts by weight of water to 100 parts by weight of at least one chestnut skin of chestnut demon skin and chestnut astringent skin, and preparing a composition containing chestnut skin and water;
Step of extracting the polyphenols composition, process pressure acting in the composition is kneaded using an extruder which is ^{0kg / cm 2 ~10kg / cm 2} , and from the obtained chestnut skin treated,
A process for producing polyphenols.

  Item 8. Item 8. The method according to Item 7, wherein the processing temperature of the composition during extruder processing is 80 ° C to 130 ° C.

  Item 9. Item 9. The method according to Item 7 or 8, wherein the content of water contained in the composition during extruder processing is 30% to 50%.

  Item 10. Furthermore, the method in any one of the items 7-9 including the process of carrying out the enzyme treatment of the said chestnut skin processed material.

  Item 11. Furthermore, the method in any one of the items 7-9 including the process of fermenting the said chestnut skin processed material.

  Item 12. The step of extracting polyphenol from the obtained processed chestnut skin product comprises the step of extracting the processed chestnut skin product with at least one extraction solvent selected from the group consisting of water, an alcohol aqueous solution, an alkaline aqueous solution and an alkaline alcohol aqueous solution. 8. The method according to item 7.

  Item 13. 13. The method according to item 12, wherein the step of extracting polyphenol from the obtained processed chestnut skin product comprises the step of extracting the processed chestnut skin product together with the extraction solvent at 100 ° C. to 150 ° C. in an autoclave.

  If the chestnut skin is processed at a high pressure as in the case of a normal extruder process, the extraction efficiency of the active ingredient is reduced. However, a processed chestnut skin product with excellent extraction efficiency can be obtained by processing the extruder at a low pressure. In particular, by performing an extruder treatment in which the temperature conditions and the amount of water are adjusted, the fiber structure of chestnut skin is sheared and broken, and a chestnut skin processed product with excellent extraction efficiency is obtained.

  As a result of performing the extraction operation under the same conditions for the processed chestnut skin obtained by the method of the present invention and the untreated chestnut skin, it is extracted from the processed chestnut skin processed by the extruder according to the processing method of the present invention. The amount of polyphenol was about 1.5 times higher than that of untreated chestnut skin. That is, polyphenol extraction amount data (warm water extraction) by chestnut skin is 12 (catechin equivalent amount mg / g) when chestnut skin is used as it is, and crushed chestnut skin is used. When extracted with warm water under the same conditions, 18 (catechin equivalent amount mg / g), and when extracted with warm water using the chestnut skin treated with an extruder (product temperature 120 ° C. in Example 2 described later) 27 (catechin equivalent amount mg / g). In addition, in the chestnut skin treated with the extruder, gallic acid is increased by about 1.8 times and (+)-catechin is increased by 2.6 times, so that there is an effect of increasing the polyphenol component in addition to the shear fracture effect.

  Thus, the extraction rate of chestnut skin increased by the extruder treatment according to the treatment method of the present invention.

  The present invention is described in detail below.

  The chestnut skin used in the present invention is any one of pericarp (demon skin) and seed skin (astringent skin) constituting chestnut fruit, or a mixture thereof. As for the chestnut varieties, Japanese chestnut, Chinese chestnut, European chestnut, and the like can be used, but the chestnut variety is not limited thereto. Furthermore, the chestnut skin can be used in any state, including a raw state, a raw frozen state, a dried state, or a state after baking. The chestnut skin used in the present invention can be used by mixing the above-mentioned various varieties of chestnuts.

  Chestnut skin usually contains a mixture of dried demon skin and astringent skin as the main component (90% by weight or more), but may contain chestnut fruit.

  When the chestnut skin is treated with an extruder, it may be used as it is, but it is desirable in terms of processing to use a dried chestnut skin that has been dried and pulverized with a fine powder grinder such as a mascolloider or a mill.

  The extruder used in the present invention includes a screw, a barrel, a die head, a driving device, a raw material supply device, and a control device, and has a function of performing mechanical processing and heat treatment at the same time.

  Specifically, it has the ability to combine transfer, compression, pulverization, mixing, kneading, liquid removal, deaeration, heating, cooling, expansion, formation, etc. as necessary and perform it continuously in a short time. It is a machine that paves the way for advanced use of low-use resources.

  A 1-axis or 2-axis extruder is used, but a 2-axis extruder is preferred. For example, there is a twin screw extruder for food processing (Excelda TCO-50) manufactured by Shinko Techno Co., Ltd., but it is not particularly limited as long as it has the above functions.

  The part in which the screw is stored is called a barrel, and the material temperature near the outlet in the barrel is preferably 80 ° C to 130 ° C. A more preferable material temperature is 100 to 120 ° C.

  When the material temperature near the outlet in the barrel is less than 80 ° C, the efficiency of extraction from the processed chestnut skin processed product tends to decrease, and when it exceeds 130 ° C, the chestnut is burnt. There may be a strange odor.

  As for the amount of water added into the extruder, the content of water contained in the composition containing chestnut skin is preferably 10% to 80% (all by weight). Particularly preferable water content is 30% to 50%, and 30 to 40% is particularly preferable.

  When the water content is less than 10%, the kneading process in the extruder tends to be insufficient, and the efficiency at the time of extraction tends to decrease. When the content exceeds 80%, the viscosity of the composition is too low. As a result, the kneading process in the extruder becomes insufficient, and the composition flows out.

The pressure near the outlet of the barrel (that is, the pressure acting on the composition in the extruder) ^{is 0kg / cm 2 ~10kg / cm 2} . 0kg ^/ cm ² ~5kg ^/ cm 2 is particularly preferred. When the pressure near the outlet in the barrel exceeds 10 kg / cm ² , the composition containing chestnut skin is excessively pressurized, so that the fiber structure of chestnut skin is not sufficiently solved (that is, the chestnut skin becomes agglomerated). The efficiency in extracting the processed product of chestnut skin decreases.

Particularly preferred conditions during the extruder processing are the pressure acting on the composition of 0 kg / cm ^{2 to} 5 kg / cm ² , the processing temperature of 100 ° C. to 120 ° C., and the content of water contained in the composition of 30% to 40 %.

  However, in improving the extraction efficiency, among the conditions during the extruder processing, the pressure acting on the composition greatly affects the processing temperature and the content of water contained in the composition.

The die attached to the tip of the barrel is mainly for the purpose of forming a product, and there are three types for forming, expanding, and organizing, but there is no particular limitation. For formation, the diameter of the outlet is not limited, but a diameter of 2 mm or more is preferable.
(Method for extracting active ingredients)
In order to extract an active ingredient from the processed chestnut skin obtained by the above method, a conventionally known method can be employed.

  The solvent used for the extraction is not particularly limited, and water, an alkaline aqueous solution, a lower alcohol, a polyhydric alcohol, and other polar solvents can be used. Preferably, water, ethyl alcohol aqueous solution, alkaline aqueous solution, and alkaline ethyl alcohol aqueous solution can be mentioned. Examples of the alkali include sodium hydroxide and potassium hydroxide.

  As the extraction method, a generally used method can be employed. Although not limited, for example, a method of extracting the processed chestnut skin product by immersion in a solvent while cooling, digesting or heating, a percolation method, or the like can be given.

  Extraction temperature in particular is not restrict | limited, It can select suitably in the range of 4-100 degreeC. Usually, it can be performed at room temperature.

  Further, the extraction solvent may be extracted while being pressurized in an autoclave, and the extraction temperature in that case may exceed 100 ° C. For example, you may extract at 100 to 180 degreeC in an autoclave, and 110 to 150 degreeC is especially good.

  The time for autoclave extraction is preferably 110 to 150 ° C. for 5 to 60 minutes, more preferably 5 to 30 minutes.

  If the autoclave extraction condition is less than the above range, the extraction efficiency tends to decrease, and if the extraction temperature exceeds the above range, production control may become difficult or the active ingredient may be excessively decomposed, and the economy Disadvantageous.

  Immersion may be performed in a stationary state, or may be performed while stirring or shaking. The extraction time is not particularly limited, and can be appropriately selected from 1 hour to 2 weeks.

  Further, the volume of the extraction solvent is not particularly limited. Preferably, the treatment is repeated 2 to 3 times using a solvent having a ratio of 10 to 100 times (weight ratio) to the dry weight 1 of the processed chestnut skin used for extraction. It can also be extracted using a supercritical or subcritical solvent.

  The obtained extract can be used as it is, or partially concentrated by distilling off the solvent, after removing solids by solid-liquid separation methods such as filtration or centrifugation as necessary. Or dried and used in the form of an extract or a dried extract.

  The extract can be used as a component of, for example, food, medicine, feed or reagent.

  Thus, by performing the extruder process at a low pressure before the chestnut skin extraction process, the chestnut skin tissue can be effectively destroyed and the extraction efficiency can be increased.

In this specification, the extruder process is usually performed under the following conditions.
(1) Raw material supply amount 5 (kg / h)
(2) Screw rotation speed 120 (rpm)
(3) Added water 2 (l / h)
(4) Material temperature 120 (° C)
(5) Pressure 0 (kgf / cm ² )
(6) Temperature: first chamber 100 ° C, second chamber 120 ° C, third chamber 130 ° C
Next, if necessary, the processed chestnut skin product is treated with an enzyme.

  In the enzyme treatment, about 20 to 50 times, particularly 30 times, distilled water is added to the weight of the processed chestnut skin, and the enzyme reaction conditions are 120 minutes at a temperature of 45 to 50 ° C. and a pH of 4.5 to 5.0. It is preferable to stir.

  As the enzyme, a conventionally known enzyme can be used, but it is preferable to use a fibrinolytic enzyme, more preferably cellulase or hemi, since the pH range is wider and high extraction efficiency is obtained. Such as cellulase.

For example, in the case of cellulase, the amount of enzyme used is preferably set to a value of 3.0 × 10 ⁶ units to 9.0 × 10 ⁷ units per 1000 g of chestnut skin. The reason for this is that when the amount of enzyme used is less than 3.0 × 10 ⁶ units, the extraction efficiency per unit time may be significantly reduced, and when the amount of enzyme used exceeds 9.0 × 10 ⁷ units. In some cases, the amount of impurities increases or it is difficult to adjust the average molecular weight of the extracted component (active component) obtained.

Moreover, in the case of hemicellulase, it is preferable to set it as the value of 9.0 * 10 < ⁶ > unit-2.7 * 10 < ⁸ > unit per 1000g of chestnut skin. The reason for this is that if the amount of enzyme used is less than 9.0 × 10 ⁶ units, the extraction efficiency per unit time may be significantly reduced, and if the amount of enzyme used exceeds 2.7 × 10 ⁸ units. In some cases, the amount of impurities increases or it is difficult to adjust the average molecular weight of the extracted component (active component) obtained.

  In addition, the enzyme unit of cellulase was calculated | required based on the fiber digestion test method (Amano method). That is, this is a method in which an enzyme is allowed to act on carmellose sodium as a substrate, and the degradation product (reducing sugar) is colorimetrically determined as glucose by the Somogy Nelson method. Moreover, the enzyme unit of hemicellulase was calculated | required based on the xylanase force test method (Amano method). That is, the enzyme is allowed to act on xylan as a substrate, and the decomposition product (reducing sugar) is colorimetrically determined as xylose by the Somogy Nelson method.

  In this invention, you may ferment the chestnut skin processed material after an extruder process as needed. The fermentation treatment can be performed according to a conventionally known method.

  Next, an active ingredient is extracted from the processed chestnut skin after enzyme treatment or fermentation treatment. The active ingredient extraction method can be performed according to the method described above. Moreover, hot water extraction can also be performed as shown below.

  When hot water extraction is performed at normal pressure, hot water extraction at 60 ° C. to 100 ° C. is preferably performed for 30 to 60 minutes. More preferably, hot water extraction at 90 ° C. to 100 ° C. is performed for 30 to 60 minutes.

  If the extraction temperature is less than 60 ° C, the extraction efficiency may be significantly reduced. If the extraction temperature exceeds 100 ° C, production management may be difficult, or the active ingredient may be excessively decomposed.

  If the extraction time is less than 0.5 hours, the extraction efficiency may be significantly reduced, and if the extraction time exceeds 1 hour, it is economically disadvantageous.

  Next, if necessary, the extraction solvent obtained in the extraction step is cooled to room temperature and suction filtered.

  The active ingredients (proanthocyanidins, catechins, and other polyphenols) obtained in the present invention can be added to foods and drinks, cosmetics, pharmaceuticals, and the like.

  Hereinafter, the present invention will be specifically described by way of examples. The present invention is not limited to the examples.

In addition, the hot water extraction method in the following examples was as follows.
(Hot water extraction process)
300 ml of water is added to 9 g of a sample (chestnut sample), and hot water extraction at 90 ° C. is performed for 30 minutes.

  Next, the extraction solvent obtained in the extraction step is cooled to room temperature and suction filtered.

  The amount of catechin (mg / g) was calculated by measuring the absorbance by the Folin-Ciocalteu method and using catechin as a standard substance.

  In the following examples, a mixture of dried demon skin and astringent skin was used as a raw material.

In addition, although the mixture of the dried demon skin and astringent skin occupies the main part in the raw material, the fruit of a chestnut may be mixed.
Example 1
The pressure in the extruder treatment of chestnut skin powder (raw material) was examined.

  The chestnut skin powder (raw material) was treated at room temperature using a mascolloyer (manufactured by Masuko Sangyo Co., Ltd.).

Next, the temperature in the cylinder is set to 80 to 120 ° C., the water weight is set to 40 parts by weight with respect to 100 parts by weight of the raw material, and the outlet pressure of the extruder is changed between 0, 5, 10, and 12 kgf / cm ^2. The chestnut skin powder was treated with an extruder.

  The obtained processed chestnut skin product was subjected to hot water extraction, the content of the hot water extract (polyphenol) was measured, and converted to a catechin equivalent (mg / g). The results are shown in Table 1.

（実施例２）
栗皮粉末（原料）のエクストルーダー処理における温度の検討を行った。

(Example 2)
The temperature in the extruder treatment of chestnut skin powder (raw material) was examined.

  The chestnut skin powder (raw material) was treated at room temperature using a mascolloyer (manufactured by Masuko Sangyo Co., Ltd.).

Next, the water weight is set to 40 parts by weight with respect to 100 parts by weight of the raw material, the extruder outlet pressure is set to 0 kgf / cm ^2, and the temperature in the cylinder is set to 80 ° C., 100 ° C., 120 ° C. and 130 ° C. Extruder treatment of chestnut skin powder was performed.

The outlet pressure of the extruder was adjusted to 0 kgf / cm ² by adjusting the chestnut skin powder, water supply amount, temperature, and the like.

  The obtained processed chestnut skin product was subjected to hot water extraction, the content of the hot water extract (polyphenol) was measured, and converted to a catechin equivalent (mg / g). The results are shown in Table 2.

（実施例３）
栗皮粉末（原料）のエクストルーダー処理における加水量の検討を行った。

(Example 3)
The amount of water in the extruder treatment of chestnut skin powder (raw material) was examined.

  The chestnut skin powder (raw material) was treated at room temperature using a mascolloyer (manufactured by Masuko Sangyo Co., Ltd.).

Next, the temperature inside the cylinder is set to 100 ° C., the pressure of the extruder is set to 0 kgf / cm ² , and the amount of water with respect to 100 weight of the raw material is changed between 30, 40, and 50 weight, and the chestnut skin powder is processed. It was.

  The obtained processed chestnut skin was subjected to hot water extraction, and the increase rate of the hot water extract was measured. The results are shown in Table 3.

（実施例４）
栗皮粉末（原料）5000ｇを、マスコロイダー（増幸産業株式会社製）を用いて室温にて処理した。

Example 4
5000 g of chestnut skin powder (raw material) was treated at room temperature using a mascolloider (manufactured by Masuko Sangyo Co., Ltd.).

Next, 2000 ml of water was added to 5000 g of the obtained chestnut skin powder, and heated and kneaded using an extruder under the following processing conditions.
(1) Screw rotation speed 120 (rpm)
(2) Material temperature 120 (° C)
(3) Pressure 0 (kgf / cm ² )
50 times the amount of water was added to the obtained chestnut skin treated product, and this composition was subjected to enzyme treatment.

  The enzyme treatment conditions were cellulase or hemicellulase as the enzyme (amount shown in Table 4-1 and Table 4-2), and were performed at 45 ° C. to 50 ° C. for 2 hours at pH 4.5 to 5.0. This enzyme treatment also serves as water extraction.

  The obtained enzyme treatment composition was filtered and centrifuged, and the content of polyphenol in the extract was measured. The results are shown in Tables 4-1 and 4-2.

（実施例５）
栗皮粉末（原料）5000ｇを、マスコロイダー（増幸産業株式会社製）を用いて室温にて処理した。

(Example 5)
5000 g of chestnut skin powder (raw material) was treated at room temperature using a mascolloider (manufactured by Masuko Sangyo Co., Ltd.).

Next, 2000 ml of water was added to 5000 g of the obtained chestnut skin powder, and heated and kneaded using an extruder under the following processing conditions.
(1) Screw rotation speed 120 (rpm)
(2) Material temperature 120 (° C)
(3) Pressure 0 (kgf / cm ² )
50 times the amount of water was added to the obtained chestnut skin processed product, and this composition was subjected to a fermentation treatment.

  Fermentation treatment conditions were performed at 25 ° C. to 35 ° C. for 45 hours at pH 4.0 to 6.0 using the bacteria shown in Table 5.

  Extraction for 20 minutes was performed in an autoclave at 121 ° C. using the obtained fermented composition.

  The content of polyphenol in the extract was measured. The results are shown in Table 5.

（実施例６）
上記実施例１（材料圧力０kgf/ｃｍ^２）で得られた栗皮処理物についてアルカリ性水溶液抽出を行い、アルカリ度の変化による抽出物（ポリフェノール）の変化を測定した。抽出方法は、栗皮試料１ｇに水１００ｍｌを加えて行った以外は上記熱水抽出工程と同じである。

(Example 6)
The processed chestnut skin obtained in Example 1 (material pressure 0 kgf / cm ² ) was subjected to alkaline aqueous solution extraction, and the change in the extract (polyphenol) due to the change in alkalinity was measured. The extraction method is the same as the hot water extraction step except that 100 ml of water is added to 1 g of chestnut skin sample.

  The results are shown in Table 6.

（実施例７）
上記実施例１（材料圧力０kgf/ｃｍ^２）で得られた栗皮処理物１ｇに対して水５０ｍｌを加えたものについてアルコール水溶液抽出（７０℃、２０分）を行い、エタノール濃度の変化による抽出物（カテキン）の変化を測定した。

(Example 7)
An aqueous solution of alcohol extracted (70 ° C., 20 minutes) was added to 1 g of chestnut skin processed product obtained in Example 1 (material pressure 0 kgf / cm ² ), and extracted by changing the ethanol concentration. Changes in the product (catechin) were measured.

  The results are shown in Table 7.

（実施例８）
上記実施例１（材料圧力０kgf/ｃｍ^２）で得られた栗皮処理物について、表８に示す各種の抽出溶媒を用いて抽出を行い、各抽出溶媒によるポリフェノール総量を測定した。その結果を表８にカテキンｍｇ相当量/ｇで示す。

(Example 8)
About the chestnut skin processed material obtained in the said Example 1 (material pressure 0 kgf / cm < ² >), it extracted using the various extraction solvent shown in Table 8, and measured the polyphenol total amount by each extraction solvent. The results are shown in Table 8 as mg equivalent to catechin / g.

  In addition, in the said extraction, 50 ml of each solvent was used with respect to 1 g of processed chestnut skin, and each 20 minutes (normal pressure) extraction was performed. When water and an alkaline aqueous solution were used as the solvent, the extraction temperature was 20 ° C., 50 ° C., 90 ° C., normal pressure, and when the extraction temperature was 121 ° C., extraction was performed in an autoclave for 20 minutes.

  The results are shown in Table 8.

表８の結果から、水、アルコール水溶液、アルカリ性アルコール水溶液、アルカリ性水溶液において、それぞれ抽出温度が高いほど、抽出量が増大することがわかる。また、水とアルカリ性水溶液の２つの場合においては、オートクレーブで１２１℃（２０分）での抽出が従来の１００℃以内の抽出よりも効果が高いことがわかる。
（実施例９）
栗皮粉末（原料）のマスコロイダー処理と、さらにエクストルーダー処理における没食子酸と（＋）−カテキンの抽出効率の比較を行った。

From the results in Table 8, it can be seen that the extraction amount increases as the extraction temperature increases in water, an aqueous alcohol solution, an aqueous alkaline alcohol solution, and an aqueous alkaline solution. Moreover, in two cases of water and alkaline aqueous solution, it turns out that the extraction in 121 degreeC (20 minutes) with an autoclave is more effective than the conventional extraction within 100 degreeC.
Example 9
Comparison of the extraction efficiency of gallic acid and (+)-catechin in the mass colloider treatment of chestnut skin powder (raw material) and further in the extruder treatment was performed.

  For the mascoloyder treatment, a raw material (a mixture of dried demon skin and astringent skin) was treated at room temperature using a product manufactured by Masuko Sangyo Co., Ltd.

  After the mascoloider treatment, the obtained chestnut skin powder was subjected to hot water extraction, and the contents of gallic acid and (+)-catechin were measured.

  As a result, gallic acid was 0.47 mg / g and (+)-catechin was 0.15 mg / g.

Extruder treatment is performed by using a twin-screw extruder for food processing (Excelda TCO-50) manufactured by Shinko Techno Co., Ltd., and 100 parts by weight of chestnut skin powder obtained by the above mass collider treatment, and 40 parts by weight of water added. The extruder outlet pressure was set to 0 kgf / cm ² , and the product temperature (temperature in the cylinder) was set to 120 ° C.

  After the extruder treatment, the obtained chestnut skin processed product was subjected to hot water extraction, and the contents of gallic acid and (+)-catechin were measured.

  As a result, gallic acid was 0.87 mg / g, and (+)-catechin was 0.37 mg / g.

  Thus, in the chestnut skin treated with the extruder, the extraction amount of gallic acid is about 1.8 times and the extraction amount of (+)-catechin is 2.6 times that of the chestnut skin only treated with the mass colloider. It was increasing.

  From the above examples, it can be seen that the extraction content of polyphenol increased by subjecting the dried chestnut (demon skin) powder to an extruder treatment at a low pressure.

  Moreover, it turns out that the extraction content of polyphenol increases further by carrying out the enzyme or fermentation process of the processed chestnut skin thing.

  According to the present invention, a method for efficiently extracting active ingredients such as polyphenols from chestnut skin can be provided.

Claims (13)

A method for treating chestnut skin, wherein a composition comprising at least one chestnut skin of chestnut demon skin and chestnut astringent skin is processed by an extruder to obtain a chestnut skin treated product,
During the extruder process, the processing method of the chestnut skin pressure acting on the composition is ^{0kg / cm 2 ~10kg / cm 2} . The method according to claim 1, wherein the processing temperature of the composition during extruder processing is 80 ° C. to 130 ° C. The method according to claim 1 or 2, wherein the content of water contained in the composition during extruder processing is 30% to 50%. The method according to any one of claims 1 to 3, wherein the processed chestnut skin is subjected to an enzyme treatment. The method according to claim 1, wherein the processed chestnut skin is subjected to a fermentation process. The chestnut skin processed product according to claim 1 is extracted with at least one extraction solvent selected from the group consisting of water, an alcohol aqueous solution, an alkaline aqueous solution and an alkaline alcohol aqueous solution. Production method. Adding 10 to 80 parts by weight of water to 100 parts by weight of at least one chestnut skin of chestnut demon skin and chestnut astringent skin, and preparing a composition containing chestnut skin and water;
Step of extracting the polyphenols composition, process pressure acting in the composition is kneaded using an extruder which is ^{0kg / cm 2 ~10kg / cm 2} , and from the obtained chestnut skin treated,
A process for producing polyphenols. The method according to claim 7, wherein the processing temperature of the composition during extruder processing is 80 ° C. to 130 ° C. The method according to claim 7 or 8, wherein the content of water contained in the composition during extruder processing is 30% to 50%. The method according to any one of claims 7 to 9, further comprising an enzyme treatment of the processed chestnut skin product. Furthermore, the method of any one of Claims 7-9 including the process of fermenting the said chestnut skin processed material. The step of extracting polyphenol from the obtained processed chestnut skin product comprises the step of extracting the processed chestnut skin product with at least one extraction solvent selected from the group consisting of water, an alcohol aqueous solution, an alkaline aqueous solution and an alkaline alcohol aqueous solution. 8. The method of claim 7 comprising. The method according to claim 12, wherein the step of extracting the polyphenol from the obtained processed chestnut skin product includes the step of extracting the processed chestnut skin product with the extraction solvent at 100 ° C to 150 ° C in an autoclave.