• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVII)
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• pp.821-826
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• 2005

Postprandial hyperglycemia plays an important role in the development of type 2 diabetes and complications associated with the disease such micro-and macro-vascular disease. The present study investigated the effect and action mechanism of a ethanolic extract from the Schizandra chinensis(SC-E) on hypeglycemia in vivo and in vitro. In vitro, SE-E demonstrated a potent inhibitory effects on ${\alpha}-amylase$ activity ($IC_{50}$ : 4 ${\mu}g/ml$). Its inhibition on ${\alpha}-amylase$ was determined to be competitive type. Oral administration of SE-E markedly lowered plasma glucose levels in non-fasted streptozotocin induced diabetic rats (45 mg/kg BW). In addition when it was orally administrated to rats with starch (2g/kg BW), SC-E (50 and 100 mg/kg BW) significantly suppressed the increase of blood glucose levels after starch loading . These results suggest that some edible plants merit further evaluation for clinical usefulness as anti-diabetic drugs.

• 한국미생물·생명공학회지
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• 제22권1호
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• pp.7-12
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• 1994

One bacterial strain, that had made the largest inhibition zone at the antagonism assay and also that lost the inhibition activity by the protease treatment, was isolated from raw milk. That strain was identified as Streptococcus salivarius subsp. thermophilus. The specific growht rate of this strain was maximum at 45$\circ $C. However, at this temperature the strain produced no bacteriocin. The bacteriocin activity was quite stable even at high temperature. Moreover, the activity of the vacteriocin was sensitive to proteases. but not to $\alpha $-amylase, DNase I, or RNase.

• 한국미생물·생명공학회지
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• 제25권2호
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• pp.109-114
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• 1997

The Oomycete Saprolegnia ferax produces an extracellular $\beta$-amylase, Maximum enzyme yield was attained after 7 days of growth in YNB starch medium (pH 6.5) at 25$\circ$C. The amylase was pu- rified 24-fold by ultrafitration, HPLC DEAE column and HPLC gel filtration. The purfied enzyme was a monomeric glycoprotein with a molecular weight of about 44,000 dalton. The pH and temperature optima were 6.5 and 50$\circ$C, respectively. The enzyme was fairly stable up to 50$\circ$C and at acidic pH region (pH 4.0-7.0). The apparent Km and Vmax values of the enzyme against soluble starch were 0.77 mg/ml and 2,174 $\mu$moles/mg protein, respectively. Amino acid analysis indicated that the enzyme was enriched in alanine, glycine, leucine and acidic amino acid. Starch hydrolysis with the enzyme released maltose but not glucose, whereas maltotriose, Schardinger dextrin ($\alpha$-cyclodextrin) and pullulan were not hydrolysed by the enzyme. The enzyme was inhibited by Schardinger dextrin, p-chloromercuribenzoate(PCMB), CU$^{2+}$' and Hg$^{2+}$. Inhibition of the enzyme by PCMB could be reversed by the addition of cysteine and mercaptoethanol.

• Advances in Traditional Medicine
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• 제9권3호
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• pp.217-224
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• 2009

In this study, four plants grown naturally in Egypt that are usually consumed by pastoral nomads were screened for their total phenolic contents, antioxidative, and anti-$\alpha$-amylase activities. Dried powder of plant's part was extracted in absolute or 70% ethanol. A polar extract of Panicum turgidum (PTPE) had the highest total polyphenol content {92.5 mg gallic acid equivalents (GAE)/g}, followed by an alkaloid extract of Withania somnifera (WSAlk; 77.5 mg GAE/g), and an ethanol extract of Leptadenia pyrotechnica (LPEE; 59.1 mg GAE/g). By employing different assays such as DPPH radical scavenging, reducing power, $Fe^+$ chelating, $H_2O_2$ scavenging and total antioxidant capacity, it was shown that PTPE, WSEE (ethanol extract of W. somnifera), WSAlk and LPEE had promising antioxidant activity, though, their potency varied according to the different tests. WSAlk had the highest level of $\alpha$-amylase inhibition (40.2%) in vitro, followed by WSEE (30.5%). Therefore, it can be concluded that these plants, especially extracts of PTPE, and WSAlk are beneficial to physiological health, and could be used in food and pharmaceutical industries to prepare dietary supplements, functional foods or food preservatives.

• Preventive Nutrition and Food Science
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• 제21권3호
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• pp.181-186
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• 2016

This study was designed to investigate the inhibitory effect of Gynura procumbens extract against carbohydrate digesting enzymes and its ability to ameliorate postprandial hyperglycemia in streptozotocin (STZ)-induced diabetic mice. G. procumbens extract showed prominent ${\alpha}$-glucosidase and ${\alpha}$-amylase inhibitory effects. The half-maximal inhibitory concentration ($IC_{50}$) of G. procumbens extract against ${\alpha}$-glucosidase and ${\alpha}$-amylase was $0.092{\pm}0.018$ and $0.084{\pm}0.027mg/mL$, respectively, suggesting that the ${\alpha}$-amylase inhibition activity of the G. procumbens extract was more effective than that of the positive control, acarbose ($IC_{50}=0.164mg/mL$). The increase in postprandial blood glucose levels was more significantly alleviated in the G. procumbens extract group than in the control group of STZ-induced diabetic mice. Moreover, the area under the curve significantly decreased with G. procumbens extract administration in STZ-induced diabetic mice. These results suggest that G. procumbens extract may help alleviate postprandial hyperglycemia by inhibiting carbohydrate digesting enzymes.

• Preventive Nutrition and Food Science
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• 제7권1호
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• pp.62-66
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• 2002

As inhibitors of carbohydrate-digesting enzymes can prevent hyperglycemia that is known to cause many macrovascular complications, they may prove a useful adjunct to hypocaloric diets in patients with type 2 diabetes and obesity. Inhibitory activities of two hundred and fifteen kinds of medicinal herb extracts against $\alpha$-glucosidase (EC 3.2.1.20) and $\alpha$-amylase (EC 3.2.1.1) have been investigated in vitro. Adenophora triphylla, Aneilema keisak, and Morus bombysis significantly suppressed rat intestinal $\alpha$-glucosidase activity iu vitro. Porcine pancreatic amylase was efficiently inhibited by methanol extracts of Epimedium koreanum, Campsis grandiflora and Salvia plebeia. Methanol extract of Epimedium koreanum among the medicinal herbs tested showed the strongest inhibitory activity against porcine pancreatic $\alpha$-amylase with 0.1 mg/ML of $IC_{50}$/. The herb extract also improved glucose tolerance in ICR mice when loaded with 0.9 g soluble starch per kg body weight. Taken together, Epimedium koreanum merits further evaluation as a therapeutic measure.

• 한국식품영양과학회지
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• 제44권5호
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• pp.681-686
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• 2015

약용식물 23종 메탄올 추출물의 폴리페놀 함량을 측정한 후 항산화 활성을 측정하고, 항당뇨 활성으로는 ${\alpha}$-amylase 저해 활성, ${\alpha}$-glucosidase 저해 활성을 검정하여 혈당강하 활성을 나타낼 수 있는 약용식물을 선발하고자 한다. 약용식물의 폴리페놀 함량을 분석한 결과 1.50~15.25 mg GAE/g의 다양한 함량 범위로 나타났으며 가장 높은 함량은 주목열매(15.25 mg GAE/g), 화살나무줄기(15.12 mg GAE/g), 두충잎(14.24 mg GAE/g)으로 3종이 나타났다. 60% 이상 DPPH 라디칼 소거능을 본 약용식물로는 두충 줄기수피(80.10%), 구기자나무 뿌리(64.25%), 화살나무 줄기(73.59%), 비수리(78.20%), 주목열매(70.52%), 뽕잎나무 잎줄기(67.81%) 부위 추출물로 6종이 선발되었다. ${\alpha}$-Glucosidase를 80% 이상 저해한 약용소재로는 두충 줄기심재, 두충 줄기수피, 화살나무 줄기, 마, 율무, 녹두 6종이 선발되었다. ${\alpha}$-Amylase를 80% 이상 저해한 약용식물로는 칡뿌리, 두충 줄기수피, 두충잎, 구기자 열매, 화살나무 잎줄기, 화살나무 줄기, 조릿대 지상부, 마, 뽕잎나무 잎줄기 추출물 등 9종이 선발되었다. 항산화 및 항당뇨 활성이 우수했던 약용식물들은 향후 새로운 의약품 개발 및 성인병 예방의 건강기능식품으로 개발하는 데 있어 좋은 기초자료로 활용될 것으로 기대된다.

• 한국식품영양과학회지
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• 제37권4호
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• pp.405-409
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• 2008

민간요법에서 화농성 피부질환이나 염증성 질환에 대해 효과가 있다고 알려진 제비꽃(Viola mandshurica)의 항산화 활성과 항당뇨 활성을 조사하였다. 제비꽃 10 g에 200 mL의 네 가지 용매(메탄올, 에탄올, 아세톤, 물)를 각각 가하여 추출한 다음, 농축하여 각각의 용매별 추출물을 얻었다. 이용매별 추출물의 총 페놀 함량은 메탄올 추출물이 34.49 mg/g 갈산 당량으로 가장 높았고, DPPH 라디칼과 ABTS 라디칼 소거능은 아세톤 추출물이 $1,000{\mu}g/mL$ 농도에서 각각 21.13%와 43.53%로 가장 높은 값을 보였다. 환원력의 경우에는 물 추출물이 $1,000{\mu}g/mL$ 농도에서 0.454의 값으로 가장 높은 활성을 보였다. 항당뇨 활성은 ${\alpha}$-amylase와 ${\alpha}$-glucosidase에 대한 저해 활성으로 측정하였는데 아세톤 추출물이 가장 활성이 높았으며 $1,000{\mu}g$/mL 농도에서 모든 효소 활성들을 저해하였다. 이상의 결과로부터 제비꽃 추출물은 항산화능과, 당뇨 관련 효소에 대한 저해능이 있음을 확인할 수 있었다.

• Journal of Microbiology and Biotechnology
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• 제25권3호
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• pp.328-333
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• 2015

A Myagropsis myagroides (Mm) methanol extract showed α-amylase inhibitory activity of 13% at a concentration of 5 mg/ml. Results showed that the hexane fraction from the Mm methanol extract exhibited α-amylase inhibitory activity with an IC₅₀ value of 4.24 mg/ml. The hexane fraction was separated using silica-gel column chromatography, and six subfractions were obtained. The fraction eluted with CHCl₃:MeOH = 50:1 showed the highest α-amylase inhibitory activity with an IC₅₀ value of 0.72 mg/ml. This fraction was purified using Sephadex LH-20 column chromatography and an octadecyl silica (ODS) Sepak cartridge, obtaining seven subfractions. Fraction (Fr.) 4 also showed a strong α-amylase inhibitory activity with an IC₅₀ value of 0.75 mg/ml. Fr. 4 was purified by Sephadex LH-20 column chromatography and ODS Sepak cartridge, obtaining six subfractions. Fr. 4-2 was identified as sargachromanol I with an IC₅₀ value of 0.40 mg/ml, and the inhibition pattern analyzed from Lineweaver-Burk plots revealed it to be an uncompetitive inhibitor. These results suggest that Mm has potential as a natural antidiabetes agent.

• 한국식품영양과학회지
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• 제39권12호
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• pp.1761-1768
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• 2010

오갈피나무 속의 가시오갈피(Eleutherococcus senticosu), 섬오갈피나무(Eleutherococcus gracilistylus), 오가나무(Eleutherococcus sieboldianus), 오갈피나무(Eleutherococcus sessiliflorus)의 잎 부위를 이용하여 $\alpha$-glucosidase와 $\alpha$-amylase 활성 저해 효과를 통한 혈당강하 효과를 평가 하였다. $\alpha$-Glucosidase 활성 저해 효과를 비교한 결과 섬오갈피 잎 추출물이 acarbose 대비 약 43.38%의 활성 저해 효과를 나타내었고, 가시오갈피 잎 추출물이 41.24%의 저해 효과를 보였다. $\alpha$-Amylase 활성 저해 효과를 측정한 결과 acarbose가 10 mg/mL의 농도에서 73.25%의 활성 저해 효과를 보였으며, 가시오갈피 잎 추출물이 acarbose 대비 91.90%의 높은 활성 저해 효과를 나타내었다. 또한 streptozotocin (STZ)으로 당뇨를 유도한 모델에 2주간 오갈피나무 속 식물 추출물을 섭취시킨 후 혈당과 지질 개선 효과를 탐색한 결과 STZ 투여로 인하여 모든 당뇨 유발군은 정상군에 비하여 혈당 수준이 유의적으로 증가하였다. 당뇨 유발 대조군(C)과 대비하여 시료 투여군인 가시오갈피(T1), 섬오갈피나무(T2), 오가나무(T3), 오갈피나무(T4)군 모두 혈당이 크게 감소하였다. 혈중 지질 농도 변화 실험 중 총 콜레스테롤의 함량은 정상군에 비하여 당뇨 유발 대조군은 증가하는 경향을 나타내는 반면 약물 투여군인 가시오갈피(T1), 오가나무 (T3), 오갈피나무(T4)군에서는 대조군에 비하여 유의적으로 감소하였다. HDL-cholesterol은 오가나무군에서 대조군에 비하여 55.61% 가장 크게 유의적으로 증가하였다. LDLcholesterol의 경우 정상군과 대조군과의 큰 차이가 관찰되지 않았으나 섬오갈피나무, 오가나무에서는 유의적으로 증가하였고, 가시오갈피와 오갈피나무 투여군에서는 대조군에 비하여 유의적으로 감소하였다. 혈중 중성지방의 경우 또한 총 콜레스테롤과 유사하게 대조군의 경우 혈중 농도가 증가하였다. 약물 투여군인 오가나무군은 60.16%, 오갈피군은 60.80%, 가시오갈피군은 50.16% 대조군 대비 유의적으로 감소하였다. 적출한 간 내의 중성지방의 농도를 측정한 결과 대조군의 경우 정상군에 비교하여 유의적인 증가를 보였으며, 가시오갈피군, 섬오갈피나무군은 각각 대조군 대비 유의적으로 감소하였다. 이상의 결과들에서 오갈피나무 속 추출물들은 혈당강하 및 당뇨대사 이상으로 인한 지질대사의 개선에 효과적인 것으로 나타났다.