• Applied Biological Chemistry
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• 제37권5호
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• pp.315-319
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• 1994

Pichia stipitis CBS 5776을 이용하여 볏짚 가수분해물의 fermentability를 조사하고 가수분해시 고체 강력산인 Nafion과 재래식 황산에 의한 가수분해물을 비교 검토하였다. 볏짚의 Nafion 가수분해물은 산 가수분해물보다 세포 증식 및 발효에 대한 저해 수준이 낮았으며 3.2 g/l 이상의 Pichia stipitis inoculum을 사용하면 Nafion 가수분해물의 발효에서 에탄올 생산이 가능하였다.

• Nutrition Research and Practice
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• 제4권2호
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• pp.106-113
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• 2010

In this study, we compared corn gluten hydrolyzates, BCAAs, and leucine for their effects on body weight reduction in high fat-induced obese rats in order to determine the major active components in the corn gluten hydrolyzates. After obesity was induced for 13 weeks with high fat diet, the overweight-induced SD rats (n = 64) were stratified according to body weight, randomly blocked into eight treatments, and raised for 8 weeks. Four groups were changed to a normal diet and the other groups remained on the high fat diet. Each of the groups within both diets was fed either casein, corn gluten hydrolyzates, leucine, or branched chain amino acids, respectively. Daily food intake, body weight gain, and food efficiency ratio were significantly lower in the corn gluten hydrolyzate groups compared to the other groups, regardless of the high fat diet or normal fat diet. The rats fed the corn gluten hydrolyzates diet had the lowest perirenal fat pad weights whereas muscle weight was significantly increased in the corn gluten hydrolyzates groups. Plasma triglyceride, hepatic total lipid, and total cholesterol contents were significantly reduced in the corn gluten hydrolyzates groups. Other lipid profile measurements were not significantly changed. Plasma triglyceride and hepatic total lipid were also significantly reduced in the BCAA and leucine groups. Leptin levels were significantly lower and adiponectin was significantly higher in the corn gluten hydrolyzates groups. Fasting blood glucose, insulin, C-peptide, and HOMA-IR levels were also significantly reduced in the corn gluten hydrozylates groups, regardless of fat level.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.235-238
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• 2008

We examined butanol fermentation by Clostridium beijerinckii NCIMB 8052 using various hydrolyzates obtained from rice bran which is one of the most abundant agricultural by-products in Korea and Japan. In order to increase the amount of fermentable sugars in the hydrolyzates of rice bran, various hydrolysis procedures were applied. Total eight different hydrolyzates were prepared using rice bran (RB) and defatted rice bran (DRB) with enzyme or acid treatment and both. Each hydrolyzate was evaluated in terms of total sugar concentration and butanol production after fermentation by C. beijerinckii NCIMB 8052. Acid treatment yielded more sugar than enzyme treatment and combined treatment with enzyme and acid yielded even more sugars as compared to single treatment with enzyme or acid. As a result, the highest sugar concentration (33 g/L) was observed from the hydrolyzate from DRB (100 g/L) with combined treatment using enzyme and acid. Prior to perform fermentation of the hydrolyzates, we examined the effect of P2 solution containing yeast extract, buffer, minerals, and vitamins on production of butanol during the fermentation. Fermentation of the hydrolyzates with or without additionof P2 was performed using C. beijerinckii NCIMB 8052 in a 1 L anaerobic bioreactor. Although the hydrolyzates RB were able to support growth and butanol production, addition of P2 solution into the hydrolyzates significantly improved cell growth and butanol production. Highest butanol production (12.24 g/L) was observed from the hydrolyzate of DRB with acid and enzyme treatment after supplementation of P2 solution.

• Journal of Microbiology and Biotechnology
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• 제19권5호
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• pp.482-490
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• 2009

We examined butanol fermentation by Clostridium beijerinckii NCIMB 8052 using various hydrolyzates obtained from rice bran, which is one of the most abundant agricultural by-products in Korea and Japan. In order to increase the amount of fermentable sugars in the hydrolyzates of rice bran, various hydrolysis procedures were applied. Eight different hydrolyzates were prepared using rice bran (RB) and defatted rice bran (DRB) with enzyme or acid treatment or both. Each hydrolyzate was evaluated in terms of total sugar concentration and butanol production after fermentation by C. beijerinckii NCIMB 8052. Acid treatment yielded more sugar than enzyme treatment, and combined treatment with enzyme and acid yielded even more sugars as compared with single treatment with enzyme or acid. As a result, the highest sugar concentration (33 g/l) was observed from the hydrolyzate from DRB (100 g/l) with combined treatment using enzyme and acid. Prior to fermentation of the hydrolyzates, we examined the effect of P2 solution containing yeast extract, buffer, minerals, and vitamins on production of butanol during the fermentation. Fermentation of the hydrolyzates with or without addition of P2 was performed using C. beijerinckii NCIMB 8052 in a 1-1 anaerobic bioreactor. Although the RB hydrolyzates were able to support growth and butanol production, addition of P2 solution into the hydrolyzates significantly improved cell growth and butanol production. The highest butanol production (12.24 g/l) was observed from the hydrolyzate of DRB with acid and enzyme treatment after supplementation of P2 solution.

• Preventive Nutrition and Food Science
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• 제21권4호
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• pp.338-347
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• 2016

The present study investigated the volatile compound, physicochemical, and antioxidant properties of beany flavor-removed soy protein isolate (SPI) hydrolyzates produced by combined high temperature pre-treatment and enzymatic hydrolysis. Without remarkable changes in amino acid composition, reductions of residual lipoxygenase activity and beany flavor-causing volatile compounds such as hexanol, hexanal, and pentanol in SPI were observed after combined heating and enzymatic treatments. The degree of hydrolysis, emulsion capacity and stability, 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity, and superoxide radical scavenging activity of SPI were significantly increased, but the magnitudes of apparent viscosity, consistency index, and dynamic moduli (G', G") of SPI were significantly decreased after the combined heating and enzymatic treatments. Based on these results, it was suggested that the enzymatic hydrolysis in combination with high temperature pre-treatment may allow for the production of beany flavor-removed SPI hydrolyzates with superior emulsifying and antioxidant functionalities.

• Journal of Industrial and Engineering Chemistry
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• 제68권
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• pp.301-310
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• 2018

Various catalysts such as formic acid, acetic acid, sodium hydroxide, sodium bicarbonate, carbon dioxide and nitrogen gas were used for hydrolyzates production from deoiled mackerel muscle by subcritical water hydrolysis. Above 99% hydrolysis yield was obtained using sodium bicarbonate catalyst at $260^{\circ}C/70bar$. Histamine and heavy metals concentration were reduced in hydrolyzates. Highest amount of amino acid (400.36 mg/g) and reducing sugar (24.75 mg/g) were found in hydrolyzate obtained at $260^{\circ}C/70bar$ and $220^{\circ}C/30bar$, respectively with sodium bicarbonate catalyst. Antioxidant and ACE-inhibitory activities were significantly higher in hydrolyzates obtained using sodium bicarbonate than that of others.

• 한국식품과학회지
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• 제17권6호
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• pp.506-515
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• 1985

홍삼(紅蔘)사포닌 가수분해물(加水分解物)의 항산화작용(抗酸化作用)에 의한 노화억제작용(老化抑制作用)을 구명(究明)하기 위하여 홍삼(紅蔘)사포닌을 가수분해(加水分解)하여 얻은 prosapogenin, panaxadiol 및 panaxatriol을 시료(試料)로 하여 in vitro 및 in vivo 실험(實驗)을 통하여 이들 가수분해물(加水分解物)들의 생체(生體) 과산화지질생성(過酸化脂質生成)에 미치는 억제효과(抑制效果)를 비교(比較)하였다. DPPH에 대한 전자공여능(電子供與能)(EDA)은 $13.88{\sim}19.76%$를 나타내고 있었으며 in vitro에서 과산화지질생성(過酸化脂質生成) 억제효과(抑制效果)는 현저하였으며 그 순서는 prosapogenin>panaxatriol>panacadiol이었다. POV에 의한 유효기간(誘導期間)은 이들 가수분해물(加水分解物) 홍삼(紅蔘)사포닌보다 훨씬 높았으며 prosaposenin>panaxatriol>panaxadiol의 순이었다. in vivo에서 복강(復腔)(i. p.) 및 경구(經口)(p.o.) 투여(投與)에 의한 생체내(生體內) 과산화지질생성(過酸化脂質生成) 억제효과(抑制效果)는 대조군(對照群)에 비(比)해 훨씬 효과적(效果的)이었으며, 홍삼(紅蔘)사포닌과 비교(比較)했을 때 간장(肝臟)과 신장(腎臟)에는 거의 비슷한 효과(效果)를 나타냈지만 혈액(血液)에서는 이들 가수분해물(加水分解物)이 홍삼(紅蔘)사포닌보다 훨씬 효과적(效果的)이었다. 효소활성(酵素活性)으로서 superoxide dismutase 활성(活性)을 in vitro에서 비교해 보면 이들 가수분해물(加水分解物)이 $24.2{\sim}36.4%$의 과산화지질생성(過酸化脂質生成) 억제효과(抑制效果)를 나타내고 있어, 홍삼(紅蔘)사포닌의 12.1%보다 $2{\sim}3$ 배(倍)의 효과(效果)를 나타내고 있었고, in vivo에서는 복강(復腔)(i. p.) 투여(投與)에서는 $12.9{\sim}22.2%$. 경구(經口)(p.o.) 투여(投與)에서는 $11.2{\sim}21.6%$의 높은 활성(活性)을 나타내고 있었다. 단 peroxidase 활성(活性)은 복강(復腔)(i. p.) 투여(投與)에서는 $129.0{\sim}188.6%$, 경구(經口)(p. o.) 투여(投與)에서는 $111.4{\sim}139.6%$의 활성(活性)을 나타내고 있었다.

• ALGAE
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• 제18권4호
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• pp.341-347
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• 2003

The potential antioxidative activity of water-soluble enzymatic hydrolyzates from a kelp, Ecklonia cava was evaluated by free radical scavenging and lipid peroxidation assays. To prepare water-soluble hydrolyzates from E. cava the seaweed was enzymatically hydrolyzed by five carbohydrases (Viscozyme, Celluclast, AMG, Termamyl and Ultraflo) and five proteases (Protamex, Kojizyme, Neutrase, Flavourzyme and Alcalase). Among all the hydrolyzates, Celluclast hydrolyzate effectively scavenged free radicals released from DPPH (1,1-diphenyl-2- pricrylhydrazyl) and recorded around 73% scavenging activity at the concentration of 4 mg ${\cdot}ml^{-1}$. This hydrolyzate was thermally stable and DPPH radical scavenging activity remained 80% or higher at heating temperatures of 40 and 60$^{\circ}C$ up to 12 h and around 80% at 100$^{\circ}C$ up to 8 h. AMG and Ultraflo hydrolyzate inhibited the lipid peroxidation of fish oil as that of $\alpha$-tocopherol. These results suggested that an enzymatic extraction will be an effective way for the production of a potential antioxidant from seaweeds.

• 한국수산과학회지
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• 제23권2호
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• pp.77-86
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• 1990

5N HCl과 5N NaOH로 부산물의 일종인 꽃게의 열수수출 잔사를 12시간 가수분해하여 각각 산 가수분해물과 알칼리 가수분해물을 제조한 후 산가 수분해물의 경우 $Na_2CO_3$, NaOH 및 5N NaOH로 분해한 알칼리가수분해물등의 3가지 중화처리구, 알칼리가수분해물인 경우 HCl과 5N NCl로 분해한산가수분해물의 2가지 중화처리구 총 5가지 중화 처리구로 중화하여 시험하였다. 산 가수분해물은 알칼리 가수분해물에 의한 중화처리가, 알칼리 가수분해물은 산 가수분해물에 의한 중화처리가 total nitrogen과 formol nitrogen함량을 서로 높일 수 있을 뿐만 아니라 염 함량을 줄일 수 있었으며, 가수분해물의 맛을 상승시킬 수 있었다. 5N HCl로 가수분해하여 $Na_2CO_3$, NaOH 및 5N NaOH로 분해한 가수분해물로 중화한 가수분해물의 구성 아미노산의 함량은 각각 $2,274mg\%,\;2,105.0mg\%$와 $2,683.5mg\%$였으며, 5N NaOH로 가수분해하여 5N HCl과 5N HCl로 분해한 가수분해물로 중화한 가수분해물의 구성아미노산의 함량은 각각 $1,352.5mg\%$와 $2,498.8mg\%$였다. 가수분해물의 탈색 및 탈취시험은 분말활성탄외 4종의 탈색제로 탈색시험을 한 결과, 분말활성탄의 탈색율이 우수하였으며, 활성탄의 농도가 높을수록 total nitrogen과 formol nitrogen 함량이 감소하였다. 탈색과 탈취의 목적으로 활성탄 사용시 적정농도는 $1\~2\%$였다. 탈염시험은 중화처리한 가수분해물을 고농도로 농축시켜 석출하는 염을 제거하는 방법으로 $39^{\circ}$ Brix이상으로 농축하면 염농도를 감소시킬 수 있었다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVII)
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• pp.358-362
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• 2005

High molecular weight dextran (39% alcohol, v/v), less soluble dextran, eluted from this column between T 500 and T 2000, a commercial linear dextran, Soluble dextran (45% alcohol, v/v) eluted at between T 70 and T 150 dextran. The molecular weight average of total dextran (50% alcohol, v/v) was between 150,000 to 500,000. A few oligosaccharides were detected from hydrolyzates of less soluble dextran. The hydrolyzates of soluble dextran were a family of DP 1 to 6 isomaltooligosaccharides. Compounds greater than DP 4 were branched isomaltooligosaacharides.