KR20070091809A - Antihypertensive milk compositions - Google Patents

Abstract

An antihypertensive milk composition containing at least one of casein hydrolysate and buckwheat hydrolysate is provided. The composition is excellent in a sensory attribute and in vitro and in vivo antihypertensive activity. An antihypertensive milk composition contains any one of 0.5 to 10% by weight of casein hydrolysate and 1.0 to 10% by weight of buckwheat hydrolysate. The hydrolysate is selected from Flavourzyme 500MG(Novo Nordisk), Protamex(Novo Nordisk), papain 30,000(Oka zone international), protease NP(Bioland), GC, 106(Oka zone international), Multifect Neutral(Oka zone international), Neutrase(Novo Nordisk) and Alcalase(Novo Nordisk) enzyme. The buckwheat uses tartary buckwheat(Fagopyrum tataricum) and Common buckwheat(Fagopyrum esculentum Moench).

Description

Antihypertensive Milk Compositions

1 shows the results of measuring the ACE inhibitory activity of the casein hydrolyzate according to the hydrolysis time and the concentration of each enzyme. (A: Flavorzyme 500MG + Protamex), B: Protamex, C: Favourzyme 500MG)

Figure 2 shows the ACE inhibitory activity and hydrolysis yield of the casein hydrolyzate by each enzyme. (A: Flavorzyme 500MG, B: Protamex, C: Flavorzyme 500MG + Protamex)

Figure 3 is the electrophoresis result of the casein hydrolyzate in artificial gastric juice and serous conditions. (A: peptic hydrolysate, B: pancreatin & oxgall treated hydrolysate)

Figure 4 shows the ACE inhibitory effect of the casein hydrolyzate in artificial gastric juice and serous conditions.

5 is a result of measuring the effect of inhibiting the ACE according to the hydrolyzate of each enzyme.

6 shows the results of confirming the hydrolyzate hydrolyzed by trypsin with SDS-PAGE.

7 shows the results of experiments on the antihypertensive effect on the hypertensive rats of kesin or buckwheat hydrolyzate.

The present invention relates to an antihypertensive milk composition, and more particularly, to an antihypertensive milk composition comprising any one or more of a casein hydrolyzate and buckwheat hydrolyzate.

Milk consumption in Korea has increased rapidly since 1962, when the five-year economic development plan was implemented. In 2000, the consumption of milk per capita reached 59.2 kg, and the total demand reached 2.81 million tons. While milk consumption accounts for 70-75% of milk consumption, consumption of milk oil has increased rapidly until 1987 before the Olympics, but has been stagnant since 1988. On the other hand, consumption of fermented milk increased slowly until 1987, and then rapidly increased until 1997 when the IMF crisis occurred. As such, there is a trend of increasing consumption of processed milk which gives milk functionality.

Milk contains around 3.4% protein, about 80% of which is made up of casein and the rest is made up of whey protein. Whey proteins include several water-soluble proteins, such as α-lactalbumin, β-lactoglobulin, serum albumin, immunoproteins, and proteose peptone. Casein is a small particle made of a combination of phosphoric acid and calcium, which is contained in milk. It is the case that it is tangled like tofu when making cheese. Protein in milk is an important ingredient with a very high nutritional function, which is digested in the stomach and intestines as well as the biological function of each protein, providing many of the essential amino acids that we must consume. In addition, the digestibility of milk protein is known to be more than 97%, which is more digestible protein than other vegetable proteins. In addition to the main proteins, there are various kinds of proteins such as enzymes, antibodies, and non-protein nitrogen compounds, which are known to have various nutritional and biological functions.

Milk protein products such as casein powder and whey protein powder and lactose and whey powder are produced from by-products produced after the manufacture of dairy products. Casein powder is produced for use as processed foods and other raw materials. Whey protein is produced by concentrating protein from whey, crystallized lactose from whey or dried whey powder. The milk we eat now is the most commonly used and consumed by Holstein cows.

It inhibits angiotensin-1 converting enzyme (ACE), which is involved in blood pressure increase, and regulates the biochemical mechanism of the renin-angiotensin system, a mechanism of the development of hypertension. Research has been reported that there are substances that do this. In humans, ACE is angiotensin that exhibits potent vasoconstriction by hydrolyzing C-terminal dipeptides (His-Leu) from angiotensin-I, a decapeptide produced by renin. It is a cause of hypertension by decomposing and inactivating Bradykinin, which produces II and has a blood pressure-lowering effect. As such inhibitors of ACE, low molecular peptides and derivatives thereof, and polyphenol components such as catechin and rumine of buckwheat are present in tea.

As a prior art of the present invention, Korean Patent Laid-Open Publication No. 10-2005-0113666 (Method for producing angiotensin converting enzyme (ACE) inhibitor and its use) relates to an angiotensin converting enzyme inhibitor derived from glycinein of soy flour. It is different from the configuration.

The present invention has been proposed to overcome the limitations of the prior art, the object of the present invention is excellent in antihypertensive activity in vitro and in vivo any one or more of good kine hydrolyzate, buckwheat hydrolyzate It is to provide an antihypertensive milk composition comprising a.

In order to achieve the above object, the present invention includes an antihypertensive milk composition comprising any one or more of the casein hydrolyzate, buckwheat hydrolyzate.

In the above, the casein hydrolyzate is 0.5 to 10% by weight based on the total weight, 1.0 to 10% by weight of buckwheat hydrolyzate is characterized in that added to the oil.

In addition, in the above, the hydrolyzate is flavozyme 500MG, protamex, papain 30,000, protease NP, GC 106, multifect nutral, neutrase ( neutrase) and alkalase enzyme hydrolysates can be selected and used.

Hereinafter, the present invention will be described in detail.

In order to develop anti-hypertensive functional materials and milk products with high added value using milk materials and herbal medicines, the present invention was conducted to investigate antihypertensive active substances from skim milk powder, whey protein, casein, and to search for antihypertensive activity of various herbal medicines. Therefore, buckwheat having excellent antihypertensive activity was selected and an antihypertensive milk composition was developed based on buckwheat.

For the present invention (whey), skim milk (skim milk), casein may use Seoul milk and non-lac milk products. The buckwheat may be made from fagopyrum tataricum, roasted fagopyrum tataricum, fagopyrum esculentum and roasted fagopyrum esculentum.

The hydrolysis of milk or buckwheat is Flavozyme 500MG (Novo), protamex (Novo), papain 30,000 (Oka zone international), protease NP (Bioland), GC 106 ( One or more of Oka zone international), multifect nutral (Oka zone international), neutrase (Novo), and alcalase (Novo) enzymes may be selected and used.

The milk composition according to the present invention preferably adds 0.5 to 10% by weight of the casein hydrolyzate and 1.0 to 10% by weight of the buckwheat hydrolyzate to the seed oil, and food-acceptable additives such as crystal oligosaccharides. It may include.

In the preferred embodiment of the present invention, for the case of the hydrolyzate of the casein, the protamex enzyme and the flavozyme 500 MG enzyme are most preferred as the hydrolase of milk material. In addition, the ACE inhibitory activity of the casein hydrolyzate showed that the hydrolyzate of protamex enzyme showed good overall effect on the ACE inhibitory activity, followed by the mixed enzyme (protamex enzyme + flavozyme) and the flavozyme enzyme. Appears good.

For buckwheat hydrolyzate, for conditions where buckwheat was gelatinized and hydrolyzed, multifect (36.3%), alkalase (46.2%), neutrase (30.6%), multifect and papain mixed enzyme (60.0%) Yield is shown. In addition, the buckwheat hydrolyzate was prepared at a concentration of 10 mg / ml to confirm the ACE inhibitory activity. As a result of the addition of Alcalase 2.4L FG enzyme, 61.19% for short buckwheat, 61.46% for roasted buckwheat, and 94.48% for buckwheat. , Roasted bitter buckwheat has a high ACE inhibitory effect of 34.51%.

Hereinafter, the content of the present invention will be described in more detail with reference to Examples. However, these examples are only presented to understand the contents of the present invention, but the scope of the present invention is not limited to these embodiments.

Example 1 Hydrolysis Conditions of Milk Material

Experimental material:

The whey, skim milk and casein used in the experiments were made from Seoul and non-lac milk products. The enzymes used for hydrolysis were flavozyme 500MG (Novo) and protamex. Novo, papain 30,000 (Oka zone international), protease NP (Bioland), GC 106 (Oka zone international), multifect nutral (Oka zone international), neutrase; Novo) and alcalase (Novo) enzymes were used.

(1) Determination of the activity of proteinases:

The activity measurement of each protease used in the experiment was performed as follows. 1% skim milk, whey, casein solution was adjusted to pH 7.2 and used for the experiment. After 1 ml of the solution prepared as described above was left in a 50 ° C. constant temperature water bath for 5 minutes, 1 ml of 100 mg / ml enzyme solution was added and hydrolyzed in a 50 ° C. constant temperature water bath for 30 minutes. 2 ml of 0.4 M TCA (Sigma. USA) was added to the above hydrolyzate, and the mixture was allowed to stand for 25 minutes in a 50 ° C. constant temperature water bath, followed by centrifugation at 4000 rpm for 10 minutes to obtain 1 ml of supernatant. 5 ml of 0.4 M sodium carbonate and 1 ml of 50% Folin & Ciocalteu's (Sigma. USA) reagent were added thereto, mixed, and left to stand at 50 ° C for 5 minutes for color development. The result was 660 nm (Jasco V-570 Spectrophotometer. Japan). Measured at absorbance. As a control, 1 ml of 1% casein solution and 2 ml of 0.4 M TCA were added and mixed. Then, 1 ml of enzyme was added and absorbance was measured in the same manner as described above. Enzyme activity was calculated by using 1 unit of protease activity as the amount of enzyme that produces amino acids corresponding to 100 µg of L-cystein in 1 ml of supernatant.

Protease Activity (Unit / g) = (At-Ao) × F × 1/100 × n

F: Amount of L-cysteine × enzyme dilution factor (µg) obtained from the equation Y = 2.8116X + 0.0835 (R ² = 0.9996) when the absorbance of L-cysteine was 1.000

n: dilution factor of the sample solution

As a result, the protamex enzyme showed 77.03unit / g in the non-lac milk casein product, the highest activity was 76.56unit / g in the case of Seoul milk casein product, followed by the flavozyme 500 MG enzyme 65.08unit / g. g, 63.47 units / g. In the case of skim milk, the protamex enzyme showed 45.83 units / g and 48.53 units / g, and the flavozyme enzyme showed 36.50 units / g and 35.98 units / g. In contrast, the enzyme in the liquid form showed a generally lower activity than the proteolytic enzyme in the powder form. In case of casein, GC 160 enzyme showed 52.11 unit / g, 53.76unit / g, 41.22unit / g and 42.81unit / g activity in alkalase enzyme, and 25.16unit / g in alkalase enzyme in skim milk. , 26.08 unit / g, activity of 32.71 unit / g, 39.72 unit / g in GC 160 enzyme (Table 1). Based on these results, protamex enzyme and flavozyme 500 MG enzyme were selected as hydrolytic enzymes in milk.

TABLE 1Protease activity (unit / g)

Enzymes Enzyme activity Whey Skim milk V Skim milk S Casein na v Casein na s Flavorzyme 500 MG 22.25 36.5 35.98 65.08 63.47 Protamex 21.22 45.83 48.53 77.03 76.56 Papain 3000 9.15 13.33 21.95 43.34 33.33 Protease NP 1.25 9.93 11.4 36.23 43.4 GC 160 14.24 32.71 39.72 53.76 52.11 Multifect Nutral 5.52 17.14 7.56 41.55 38.53 Neutrase 5.31 16.41 17.58 41.62 39.37 Alcalase 15.79 25.16 26.08 42.81 41.22

(2) Casein hydrolysis by enzyme concentration

Based on the results of the endopeptidase activity of the enzyme, protamex and flavozyme 500MG enzymes were selected to hydrolyze casein. After preparing a 1% casein solution, 0.5%, 1%, 1.5%, 2% (v / w) of the enzyme was added to the stirred hydrolysis for 24 hours in a 50 ℃ water bath. In addition, the mixture (protamex, flavozyme 500MG, 1: 1 ratio) was added to the enzyme of 0.5%, 1%, 1.5%, 2%, and then hydrolyzed in the same manner. The 1 mL hydrolyzate and 1 mL of 0.4M TCA (trichloro acetic acid) were mixed and centrifuged at 3000 rpm for 20 minutes, and the absorbance was measured at 280 nm.

As a result, Protamex, Flavozyme 500MG and two enzymes were mixed in a ratio of 1: 1 and hydrolyzed according to enzyme concentrations of 0.5%, 1%, 1.5% and 2%. There was no difference, and the degree of hydrolysis according to the hydrolysis time was the largest change from 0 hours to 1 hour, and did not show a significant change after 1 hour of hydrolysis.

(3) Hydrolysis according to Kesin Concentration

Casein was prepared at 1%, 5%, and 10% concentrations, and 1% of flavozyme 500MG and protamex enzyme were added to both treatment and mixed treatment groups, followed by stirring at pH 6.8 and a temperature of 50 ° C. for 24 hours. Disassembled. Hydrolysis degree was measured by centrifuging the extract for 30 minutes, and then lyophilized.

TABLE 2 Recovery of hydrolyzate

Sample Concentration Enzyme Recovery rate (%) Casein 1% Concentration (2g / 200ml) flavourzyme 500MG 85.5 protamex 88.5 mixture 93.5 Casein 5% Concentration (10g / 200ml) flavourzyme 500MG 79.1 protamex 86.0 mixture 90.5 Kesin 10% Concentration (20g / 200ml) flavourzyme 500MG 73.0 protamex 76.6 mixture 88.1

Example 2 Determination of ACE Inhibitory Activity of Kesin Hydrolysate

(1) ACE inhibitory activity and extraction yield according to hydrolysis time

Casein was prepared as a 5% solution, and protamex enzyme and flavozyme were each added at a concentration of 1% (v / w) and stirred and hydrolyzed in a water bath at 50 ° C. for 24 hours. In addition, the enzyme was mixed in a 1: 1 ratio of protamex and flavozyme was hydrolyzed under the above conditions. The 1 mL hydrolyzate and 1 mL 0.4 M TCA solution were mixed and centrifuged at 3000 rpm for 20 minutes to measure the degree of hydrolysis at absorbance at 280 nm. As a result, the degree of hydrolysis with time showed the largest change from 0 hour to 1 hour (FIG. 1).

ACE inhibitory activity was measured according to the method of Cushman et al. In other words, the ACE inhibitory activity of rabbit lung acetone powder (Sigma. USA) in 0.1 M sodium borate buffer (pH 8.3) containing 0.3 M NaCl at a concentration of 1 g / 10 ml (w / v) for 24 hours at 4 ℃ After extraction, the mixture was centrifuged at 4 ° C. and 4,000 rpm for 40 minutes to obtain an ACE crude enzyme solution. ACE inhibition activity was added to 50 μl of the sample prepared at a concentration of 10 mg / ml, 100 μl of 0.1 M sodium borate buffer (pH 8.3) and 50 μl of ACE coenzyme solution, followed by preliminary reaction at 37 ° C. for 5 minutes, followed by 0.3 M NaCl. 50 µl of a substrate prepared by adding 25 mg of HHL (hippuryl- histidyl-leucine) to 5 ml of 0.1 M sodium borate buffer (pH 8.3) was added and reacted at 37 ° C. for 30 minutes. 250 μl of 1N HCl was added to stop the reaction, 1.5 ml of ethyl acetate was added thereto, stirred for 15 seconds, and centrifuged (3000 rpm, 5 minutes, 4 ° C.) to obtain 1 ml of supernatant. The supernatant was completely dried at 120 ° C. for 30 minutes, 3 ml of distilled water was added, and then dissolved again. The absorbance was measured at 228 nm to measure the ACE inhibitory activity. As a control, 50 μl of extraction solvent was added instead of the extract, and the ACE inhibitory activity was calculated using the following formula.

As a result, the hydrolyzate of protamex enzyme showed good overall effect on ACE inhibitory activity, followed by mixed enzyme (protamex enzyme + flavozyme) and flavozyme enzyme. In other words, as a result of measuring the ACE inhibition activity of the sample obtained by stirring hydrolysis of kesin at 0, 1, 2, 3, 4, 6 and 24 hours, protamex enzyme was 0 hours (1.7%) and 1 hour (74.5%). ), 2 hours (77.9%), 3 hours (80.4%), 4 hours (82.7%), 6 hours (83.9%) and 24 hours (84.6%). 1 hour (61.8%), 2 hours (62.1%), 3 hours (67.9%), 4 hours (72.7%), 6 hours (73.8%) and 24 hours (74.1%). Flavozyme enzymes with the lowest ACE inhibitory activity were 0 hours (1.6%), 1 hour (43.4%), 2 hours (47.3%), 3 hours (49.1%), 4 hours (51.2%), 6 hours (56.9) %) And 24 hours (60.9%).

(3) Influence on the yield of hydrolysis

Through the preliminary experiment, the reaction surface regression equation for the hydrolysis yield was measured as follows for enzyme concentration (0.25-1.25%), casein concentration (2.5-12.5%) and hydrolysis time (20-100 minutes). . In other words, the highest hydrolysis yield was obtained at enzyme concentration of 0.64%, casein concentration of 8.38%, and hydrolysis time of 55.81 minutes. In addition, the R ² value for the hydrolysis yield was 0.9751, indicating a significance within 1% (Table 3).

Y = 56.8557 + 35.3010X ₁ -2.3748X ₂ + 0.1837X ₃ -12.8173X ₁ ² -0.4200X ₂ X ₁ + 0.0458X ₂ ² + 0.0675X ₃ X ₁ + 0.0057X ₃ X ₂ -0.0014X ₃ ² (R ² = 0.79751)

TABLE 3 Hydrolysis Yield

reaction R2 Pro> F Enzyme Concentration (%) Casein concentration (%) Hydrolysis Time (%) Maximum Morphology Hydrolysis Yield (%) 0.9751 0.0001 0.6409 8.3870 55.81 3.9965 saddle point ACE inhibitory activity (%) 0.8398 0.0387 0.8698 5.9732 63.86 77.6647 saddle point

(4) Effect on ACE inhibitory activity

The response surface regression equation for measuring ACE inhibitory activity for enzyme concentration (0.25-1.25%), casein concentration (2.5-12.5%) and hydrolysis time (20-100 minutes) as independent variables is as follows. In other words, enzyme concentration of 0.86%, casein concentration of 5.97%, and hydrolysis time of 63.86 minutes showed the best ACE inhibitory activity. In addition, the R2 value for ACE inhibitory activity was 0.8398, indicating a significance within 5%.

Y = 58.6166 + 48.455X ₁ -1.7729X ₂ + 0.0596X ₃ -193086X ₁ ² -1.0300X ₂ X ₁ + 0.0905X ₂ ² -0.0372X ₃ X ₁ + 0.0122X ₃ X ₂ -0.0005X ₃ ² (R ² = 0.8398)

(5) Concentration, drying and separation conditions of the casein hydrolyzate

It is reported that the molecular weight of the peptide with high ACE inhibitory activity in food protein is 1,000 Da or less. After fermenting Kesin to lactic acid bacteria, when digested with pepsin (trypsin), ACE inhibitory activity was high in the αs1-casein fraction, the molecular weight of these hydrolysates was less than 1,000 Da. Hydrolysis of κ-casein with trypsin resulted in an IC50 value of 115 μg / ml in fractions of 1,000 Da or less, but increased to 238 μg / ml in fractions of 3,500 Da, resulting in high ACE inhibitory activity in fractions of 1,000 Da or less. I reported about it. Based on these results, in this experiment, hydrolysis with enzymes that are industrially available and ultrafiltration with membranes of 500 Da, 1,000 Da and 3,000 Da resulted in the best ACE inhibitory activity in fractions below 1,000 Da. Indicated. 200 g of casein was dissolved in 2 L of distilled water, followed by primary hydrolysis for 3 hours by adding 1% protamex. 1, 0.75, 0.5, 0.25% of flavozyme enzyme was added to 100 ml of the primary hydrolyzate, followed by secondary hydrolysis for 1 hour, and a membrane of 3kDa and 1kDa was mounted on an amicon filtration device for each molecular weight. Fractionated. As a result, most occupied the lower than 1,000 Da, and was increased as the concentration of flavozyme enzyme increased (Table 4). In addition, when the concentration of 10 mg / ㎖ was tested for the ACE inhibitory activity of the fractions, the difference in molecular weight and the amount of enzyme addition did not appear significantly (Table 5).

Table 4 Recovery of Kesin Hydrolyzate after Ultrafiltration

Concentration (%) Recovery rates (%) 3,000 Da or more 3,000-1,000 Da 1,000 Da or less One 21.56 26.70 51.73 0.75 21.39 38.05 40.55 0.5 23.59 34.95 41.44 0.25 28.12 35.95 35.92

<Table 5> ACE inhibitory activity after ultrafiltration

Concentration (%) ACE inhibitory activity (%) 3,000 Da or more 3,000-1,000 Da 1,000 Da or less One 78.16 81.11 82.34 0.75 80.51 80.14 84.21 0.5 79.54 82.42 82.13 0.25 79.22 82.35 82.21

Example 3 Hydrolysis Conditions of Buckwheat Material

(1) Experimental material:

There are 4 kinds of buckwheat: bitter buckwheat (fagopyrum tataricum) and roasted buckwheat (roasted fagopyrum tataricum) provided by Korea Yakult Co., Ltd. The general components of sweet buckwheat and bitter buckwheat are shown in Table 6. A total of 12 enzymes were used as proteases and starches for hydrolysis. Proteolytic enzymes were Protamex, Papain 30000, GC 106, Neutase 0.8L, Alcalase 2.4L FG, Flavozyme 500MG, Multifect Neutral, Protease NP. A total of four species were used as Viscozyme L, AMG 300L, Pectinex 5XL, and Celluclast 1.5L FG.

<Table 6> Ingredients of Buckwheat (Unit:%)

sample Moisture protein Lipids Non-fibrous Fiber Ash FE (short buckwheat) 6.89 9.88 2.18 73.04 6.31 1.70 FT (Buckwheat) 7.24 9.53 2.26 73.49 5.82 1.66

(2) Effect of ACE inhibitory activity of buckwheat hydrolyzate according to extraction conditions

The buckwheat was ground using a blender, and then 200 g was added to 2 L of distilled water, and stirred and gelatinized at the boiling point for 1 hour. After buckling, the buckwheat was divided into 200 ml, and then inoculated with 1% of multifect, alcalase, nutrase, and papain / multifect enzyme to hydrolyze at 50 ° C. for 4 hours. In addition, 20g of crushed buckwheat was added to 200mL of distilled water, and then inoculated with 1% of multifect, alkalase, nutrase, and mixture enzyme, and hydrolyzed at 50 ° C for 4 hours. The hydrolyzate was filtered using a filter cloth and then lyophilized. As a result, the yield of multifect (36.3%), alkalase (46.2%), nutrase (30.6%), and mixed (60.0%) was obtained in the case of buckling and hydrolyzing conditions. In case of degradation, the yields of multifect (24.2%), alkalase (12.2%), nutraase (14.2%) and mixed (20.1%) were shown (Table 7). The ACE inhibitory activity of the hydrolyzate extracted by enzymatic extraction of the buckwheat under the conditions of gelatinization and grinding was measured. The results of multifect (4.5%), alkalase (26.4%), Nutrase (10.3%), mixed (23.7%) showed good activity (Table 8).

TABLE 7 Hydrolysis yield of buckwheat (%)

Enzyme Hydrolysis rates (%) Gelatinization Pulverization Alcalase 46.2 12.2 Nutrase 30.6 14.2 Multifect 36.3 24.2 Mixture (multifect / papain) 60.0 20.1

TABLE 8 ACE inhibitory activity (%) of buckwheat hydrolyzate

Enzyme ACE inhibitory activity (%) Gelatinization Pulverization Alcalase 8.3 26.4 Nutrase 3.2 10.3 Multifect 5.5 4.5 Mixture (multifect / papain) 5.1 23.7

(3) Effect of ACE inhibitory activity of buckwheat hydrolyzate according to enzyme

The buckwheat (Fagopyrum escylentum) was pulverized using a grinder and 20 g were added to 100 ml of distilled water, followed by hydrolysis at 50 ° C. for 4 hours by adding 2% of each enzyme. The hydrolyzate was centrifuged at 5,000 RPM using a centrifuge to lyophilize the supernatant. As a result, hydrolyzate added with protease showed yields of multifect neutral (25.95%), alkalase 2.4 FG (18.65%) and protease NP (21.90%). The degradation products showed low yields of less than 10%.

When buckwheat hydrolyzate was prepared at a concentration of 10 mg / mL, the ACE inhibitory activity was confirmed. As a result, starch hydrolyzate showed the best activity in the hydrolyzate added with alkalase 2.4L FG (88.55%). The hydrolyzate added with enzyme showed low ACE inhibitory activity of Biscozyme L (0.57%), AMG 300L (2.57), Pectinix 5XL (7.02%) and Cellulast 1.5 L (3.69%) (Table 9, Table 10).

Table 9 ACE inhibitory activity of short buckwheat hydrolyzate according to protease

Enzymes ACE inhibitory activity (%) Hydrolysis rate (%) Protamex 71.58 12.35 Papain 30000 71.75 8.80 GC 106 46.56 6.75 Nutrase 0.8l 73.72 11.30 Alcalase 2.4L FG 88.55 18.65 Falvourzyme 500MG 37.99 8.75 Multifect Neutral 44.59 25.95 Protease N.P 21.90 20.55

<Table 10> ACE Inhibitory Activity of Short Buckwheat Hydrolyzate by Starch Degrading Enzyme

Enzymes ACE inhibitory activity (%) Hydrolysis rate (%) Viscozyme L 0.57 8.90 AMG 300L 2.57 6.50 Pectinax 5XL 7.02 6.30 Celluclast 1.5l 3.69 7.10

(4) ACE inhibitory activity of bitter buckwheat and short buckwheat hydrolyzate according to starch degrading enzyme

Buckwheat was pulverized with a grinder to use a powder passed through 50 mesh sieve. After taking 100 ml of distilled water in each sample, Biscozyme L, AMG 300L, Pectinex 5XL, Cellulast 1.5L, Alcalase 2.4L FG, Neutase 0.8L, GC 106, Multifect Neutral Enzyme 2% (v / w), Protamex, Papain 30000, Flavozyme 500MG, Protease NP enzyme was added 2% (w / w) and the control was added with distilled water 2% instead of enzyme for 4 hours at 50 ℃ Hydrolysis. The hydrolyzate was centrifuged at 5,000 RPM for 20 minutes using a centrifuge and the supernatant was lyophilized. As a result, the yield of short buckwheat hydrolyzate was higher than that of bitter buckwheat, and raw buckwheat was higher than roasted buckwheat. The short buckwheat hydrolyzate according to starch degrading enzyme showed yields of biscozyme L (24.65%), AMG 300L (14.20%), Pectinex 5XL (15.45), and cellulose 1.5 L (15.10%) (Table 12). ). Results of ACE inhibitory activity of buckwheat hydrolyzate without enzyme were shown bitter buckwheat (67.58%), sweet buckwheat (11.82%), roasted buckwheat (9.86%) and roasted buckwheat (3.08%) (Table 11). . The enzyme-added bitter buckwheat hydrolyzate exhibited a low ACE inhibitory activity of less than 10% (Table 13).

<Table 11> ACE inhibitory activity of buckwheat hydrolyzate without enzyme (Unit:%)

sample ACE inhibitory activity Hydrolysis rate FE 11.82 7.92 RFE 9.86 7.62 FT 67.58 3.17 RFT 3.08 4.21

FE: Fagopyrum esculentum (roasted buckwheat), RFE: Roasted fagopyrum esculentum (roasted buckwheat)

FT: Fagopyrum tataricum, RFT: Roasted fagopyrum tataricum

<Table 12> ACE inhibitory effect of short buckwheat hydrolyzate according to starch degrading enzyme (Unit:%)

Enzymes ACE inhibitory activity Hydrolysis rate Buckwheat Roasted Soba Buckwheat Roasted Soba Viscozyme L 1.15 1.92 24.65 24.2 AMG 300L 2.94 4.28 14.20 17.6 Pectinex 5 × L 9.30 1.78 15.45 16.8 Celluclast 1.5L 7.47 1.71 15.10 16.8

<Table 13> ACE inhibitory activity of bitter buckwheat hydrolyzate according to starch degrading enzyme (Unit:%)

Enzymes ACE inhibitory activity Hydrolysis rate Bitter buckwheat Roasted Bitter Buckwheat Bitter buckwheat Roasted Bitter Buckwheat Viscozyme L 1.49 0.97 22.10 30.30 AMG 300L 2.95 5.74 15.90 41.45 Pectinex 5 × L 4.43 0.71 12.15 19.80 Celluclast 1.5L 5.02 0.23 9.75 14.60

(5) Effect of ACE inhibitory activity of bitter and short buckwheat hydrolysates using protease

Buckwheat was pulverized with a grinder to use a powder passed through 50 mesh sieve. 20 g of each sample was taken with 100 ml of distilled water, followed by Biscozyme L, AMG 300L, Pectinex 5 μL, Cellulast 1.5L, Alcalase 2.4L FG, Neutase 0.8L, GC 106, Multifect Neutral Enzyme Was added 2% (v / w), protamex, papain 30000, flavozyme 500MG, Protease NP enzyme was added 2% (w / w) and the control was added to distilled water 2% instead of enzyme at 4 ℃ 50 Hydrolysis for hours. The hydrolyzate was centrifuged at 5,000 RPM for 20 minutes using a centrifuge and the supernatant was lyophilized.

As a result, the yields of sweet buckwheat (18.70%), roasted buckwheat (22.20%), bitter buckwheat (19.45%), and roasted bitter buckwheat (31.88%) were obtained for the hydrolyzate added with the alkalase 2.4L enzyme. The hydrolyzate added with multifect neutral enzyme showed yields of short buckwheat (22.29%), roasted buckwheat (27.50%), bitter buckwheat (30.00%) and roasted bitter buckwheat (39.64%).

When buckwheat hydrolyzate was prepared at a concentration of 10 mg / mL, ACE inhibitory activity was confirmed. When alkalase 2.4L FG enzyme was added, buckwheat (61.19%), roasted buckwheat (61.46%), and bitter buckwheat (94.48%) ), Roasted bitter buckwheat (34.51%) showed a high ACE inhibitory activity (Table 14, Table 15).

<Table 14> ACE Inhibitory Activity of Short Buckwheat Hydrolyzate Using Protease (Unit:%)

Enzymes ACE inhibitory activity (%) Hydrolysis rate (%) Buckwheat Roasted Soba Buckwheat Roasted Soba Protamex 45.74 37.93 17.49 20.64 Papain 30000 32.33 15.00 13.16 13.00 GC 106 22.45 0.04 8.78 9.36 Neutrase 0.8L 51.92 33.83 15.64 17.69 Alcalase 2.4L FG 61.19 61.46 18.70 22.69 Falvourzyme 500MG 36.77 13.35 13.40 22.20 Multifect Neutral 30.88 22.37 22.29 27.50 Protease N.P 27.57 16.22 19.88 24.31

Table 15: ACE inhibitory activity of bitter buckwheat hydrolysates using protease (Unit:%)

Enzymes ACE inhibitory activity (%) Hydrolysis rate (%) Bitter buckwheat Roasted Bitter Buckwheat Bitter buckwheat Roasted Bitter Buckwheat Protamex 58.88 24.27 11.78 38.80 Papain 30000 81.65 34.01 6.09 6.00 GC 106 64.72 14.19 4.55 5.57 Neutrase 0.8L 69.32 25.54 10.40 22.83 Alcalase 2.4L FG 94.48 34.51 19.45 31.88 Falvourzyme 500MG 32.87 25.34 8.98 20.95 Multifect Neutral 41.90 11.24 30.00 39.64 Protease N.P 42.11 11.20 21.19 36.65

Example 4 Examining Casein Hydrolysis Conditions by Artificial Gastric Fluid, Serum, and Other Proteases

(1) Casein hydrolysis by artificial gastric juice, serous fluid and other protease

To investigate how casein is hydrolyzed under digestive conditions, hydrolysis experiments were performed under conditions of artificial gastric fluid and intestinal fluid. Hydrolysis conditions in the gastric juice were added to pepsin (E: S = 1: 2,000) in a 5% concentration of the casein solution and reacted at 37 ℃, 0 hours, 30 minutes, 1 hour, 2 hours, Hydrolysis samples were taken at 3 hour intervals. The sample thus taken was inactivated by heat treatment at 80 ° C. for 15 minutes and used in the experiment. Oxygen and pancreatine (E: S = 1: 10,000) were added to the 5% concentration of casein in the case of hydrolysis of artificial intestine solution. It was.

3 and 4 show the electrophoresis results of the casein hydrolyzate and the ACE inhibitory effect of the hydrolyzate under artificial gastric and serous conditions. In the results of Figure 3 it can be seen that the degradation of the casein by pepsin slightly decomposed over time, but almost no degradation in the hydrolyzate by pancreatin and oxal. In connection with the ACE inhibitory effect of FIG. 4, it was observed that the ACE inhibitory effect increased over time in the slightly decomposed pepsin hydrolyzate, whereas that of pancreatin and oxal which was hardly decomposed in electrophoresis. The hydrolyzate was also measured to be less than 20% after 3 hours of ACE inhibition.

(2) Confirmation of hydrolysis patterns of various proteases and substrates and the setting of optimal conditions

Casein was hydrolyzed using Sigma's trypsin, Novozymes, and Sungwoo Chemical's food proteinases.

5 is a result of measuring the ACE inhibitory effect over time of the hydrolyzate for each enzyme. As soon as the enzyme and casein reacted, all enzymes showed a high ACE inhibitory effect of over 90%. Alkalase, flavozyme, and protease, however, are not large, but show a tendency for the inhibitory effect to decrease slightly over time of hydrolysis. It is believed that excessive hydrolysis cleaves peptides involved in ACE inhibition of the hydrolyzate and loses its functionality. Figure 6 shows the results of confirming the hydrolyzate using trypsin in the case of SDS-PAGE. As a result of hydrolysis of E: S ratio to 1: 50,000 with trypsin, it was confirmed that over time, the band having a large molecular weight disappeared and the lower band having a lower molecular weight became thicker. B is an electrophoresis of (A) (E: S = 1: 10,000) of FIG. 5. Most of the components having the original molecular weight are decomposed into low molecular weight materials from 1 hour of reaction and cannot be measured with 15% gel from 5 hours. Because of the small molecular weight of the state, even the presence of the band was difficult to visually identify.

Example 5 Antihypertensive Activity of Kesin and Buckwheat Hydrolysates Using Essential Hypertension Rats

As a result of examining the antihypertensive effect of casein and buckwheat hydrolysates using essential hypertensive rats (FIG. 7), the oral administration of the casein hydrolyzate decreased 29mmHg compared to the control group that did not orally administer the casein hydrolyzate. When the buckwheat hydrolyzate was orally administered, the effect of reducing the blood pressure was 38 mmHg compared to the control group that did not orally administer the buckwheat hydrolyzate. In other words, the control group consumed normal diet and water, and the blood pressure increased gradually to 209.0mmHg at 3 weeks, starting with systolic blood pressure of 200.53mmHg at 0 weeks, and increased to 10mmHg at 219.27mmHg at 4 weeks, and at 5 weeks. Rose to 222.40 mmHg. In the experimental group administered orally 2ml of milk daily, blood pressure increased from 198.63mmHg at 0 weeks to 209.0mmHg at 4 weeks, and at 215.44mmHg at 5 weeks. In the experimental group in which casein was added orally mixed with 10% of casein hydrolyzate in milk every day, 197.5 mmHg increased from 197.67 mmHg in week 0 to 3 mmHg in week 1, but blood pressure decreased to 14 mmHg from 1 week to 183.38 mmHg. The blood pressure rose slightly again, and at 5 weeks, the blood pressure rose to 195.67 mmHg. In the experimental group in which buckwheat ( Fagogorum tataricum ) hydrolyzate was added 10% to milk and mixed orally every 2 ml, the experimental group was 200.38 mmHg at 0 weeks. In the state, blood pressure dropped sharply to about 168.89 mmHg, about 30 mmHg. From 3 weeks, it rose to 18mmHg, and from 5 weeks to 194mmHg.

Example 6 Sensory Test of Kesin and Buckwheat Hydrolysate

Roasted buckwheat was used by Yakult Co., Ltd., and 2.4L of protease alkalase and biscozyme L of starch degrading enzyme were used as enzymes purchased from Novozymes. As a method of preparing buckwheat hydrolyzate, roasted buckwheat was sieved to remove the shell, and then pulverized with a grinder to pass through 50mesh sieve. 20 L (5 times) of distilled water was added to 4 kg of buckwheat powder, followed by hydrolysis by adding 2.4 L of alkalase and multifect enzyme. First, 2% (v / w) of alkalase, a protease, was added to a buckwheat solution at 56 ° C and pH 6.3, and hydrolyzed. . After 2 hours of hydrolysis, 2% (v / w) of starch degrading enzyme was added and hydrolyzed. After 2 hours of hydrolysis, heat treatment was performed at 80 ° C. for 5 minutes to stop the reaction of the enzyme. The mixture was cooled at 4 ° C. to allow for centrifugation to occur, and then centrifuged at 5,000 RPM (3300 × g) for 15 minutes. The supernatant was centrifuged to remove impurities by 325 mesh sieve, concentrated at 70 ℃ and lyophilized.

Sensory evaluation

Buckwheat and casein hydrolysates were prepared for each concentration (1. 3, 5, 7, 10%), and sensory tests were performed by a 9-point (very good) scoring method. As a result of sensory evaluation, 5% of buckwheat hydrolyzate was found to be the best in flavor and color, and 1% of casein hydrolyzate was best. In addition, in the case of the mixture of the casein hydrolyzate and the buckwheat hydrolyzate 2: 8 was added 1% was evaluated as the best (Table 16).

<Table 16> Sensory Evaluation of Milk Added with Buckwheat Hydrolyzate and Casein Hydrolyzate

sample Concentration (%) Sensory attribute Tast Flavor Color Overall palatability BW ^{1 )} 10 6.7 5.7 6.0 6.3 7 7.7 6.7 7.3 7.7 5 7.3 6.9 7.4 7.8 3 7.0 5.7 6.3 7.3 One 7.3 5.3 6.3 7.0 CS ^{2 )} 10 1.0 2.5 3.7 1.3 7 1.3 1.8 5.3 2.0 5 2.3 3.5 6.0 3.0 3 4.8 5.5 6.8 5.7 One 5.5 6.2 7.8 6.5 BC ^{3 )} 10 1.0 2.0 4.7 1.7 7 2.0 3.0 4.5 3.2 5 3.5 4.3 5.3 4.3 3 5.8 6.2 6.7 6.2 One 7.7 6.8 7.3 7.3

¹⁾ BW: Buckwheat hydrolyzate

²⁾ CS: hydrolyzate of kesin

³⁾ BC: A mixture of Kesin hydrolyzate and buckwheat hydrolyzate at 2: 8

According to the present invention, the antihypertensive milk composition comprising any one or more of low molecular weight casein hydrolyzate and buckwheat hydrolyzate using natural materials having excellent organoleptic properties and excellent antihypertensive activity in vitro and in vivo Can be provided.

Claims (3)

Antihypertensive milk composition comprising any one or more of the casein hydrolyzate, buckwheat hydrolyzate. The antihypertensive milk composition according to claim 1, wherein the casein hydrolyzate is added in an amount of 0.5 to 10% by weight and 1.0 to 10% by weight of the buckwheat hydrolyzate. The hydrolyzate of claim 1 or 2, wherein the hydrolyzate is flavozyme 500 mg, protamex, papain 30,000, protease NP, GC 106, multifect nutral ), Neutrase, alkalase (alcalase) enzyme hydrolyzate is selected from any one or more of the antihypertensive milk composition.

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