• Preventive Nutrition and Food Science
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• 제12권3호
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• pp.177-180
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• 2007

Tocotrienols (T3) are minor plant constituents found abundantly in rice bran, which provide a significant source of vitamin E in animal feeds. T3 was reported to have an intrinsic hypocholesterolemic effect by inhibiting HMG-Co A reductase. It has similar antioxidative properties as tocopherols in food and biological system due to their similar chemical structures. However, the antioxidant activity and mechanism of T3 to scavenge free radicals and to inhibit the peroxidation of linoleic acid are less understood. The purpose of this study was to investigate the scavenging effect of T3 on free radicals and its inhibition of peroxide formation. Free radical scavenging activity was monitored by the DPPH (1,1-diphenyl-2-picrylhydrazyl) method whereas inhibition of linoleic acid peroxidation was evaluated using the thiocyanate method. Thiobarbituric acid (TBA) test was used to determine malonaldehyde formation from linoleic acid peroxidation. Free radical scavenging activity increased with increasing concentration levels of T3. T3 exhibited 38.2, 78.6, 92.7 and 96.2% radical scavenging activity at concentrations of 2, 8, 32 and 128 ppm, respectively. At 128 ppm, it was highly effective in inhibiting linoleic acid peroxidation. The activity of T3 evaluated by the thiocyanate method showed low absorbance values indicating a high level of antioxidant activity. All treatments showed similar trends in antioxidant activity when evaluated by both the thiocyanate method and TBA test.

• 한국수산과학회지
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• 제20권5호
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• pp.419-430
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• 1987

지질산화생성물에 의한 DNA손상작용 및 그 억제 기구를 밟히기 위하여 linoleic acid와 plasmid DNA와의 모델계를 통하여 검토하였는데, 그 결과를 요약하면 다음과 같다. 1. Linoleic acid의 산화에 의하여 DNA가 손상되었으며, 그 정도는 linoleic acid의 양이 많을 수록 크게 나타났다. 2. Linoleic acid의 산화에 의한 DNA손상작용은 POV 100 mea/kg이하인 산화초기에서도 빠르게 진행되었다. 산화초기의 DNA손상작용에는 활성산소 종의 관여가 크게 나타났는데, 그 중에서도 일중항 산소와 superoxide anion의 영향이 큰 것으로 나타났다. 3. 지질 2차반응생성물인 malonaldehyde와 hexanal의 DNA손상작용은 linoleic acid경우와는 달리 활성산소종과는 무관하였으며 DNA와 와의 복합체형성에 의하였다. 4. Linoleic acid hydroperoxide의 DNA 손상작용은 linoleic acid의 초기신화에 의한 DNA손상작용 보다 크게 나타났고, 활성산소종의 영향은 없었다. 5. 지진산화생성물에 의한 DNA손상 작용은 천연 항산화성분(마늘 및 생강추출물) 및 활성산소소거제($\alpha-tocopherol 및 superoxide dismutase$의 첨가에 의하여 크게 억제되었다. 특히 . 마늘 및 생강추출물은 활성산소종의 생성을 비롯하여 공액 diene 및 POV의 증가 또한 크게 억제하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제17권11호
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• pp.1582-1585
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• 2004

The antioxidative ability on the basis of reduced glutathione sulphydryl level, the inhibition activities of linoleic acid peroxidation of cell free extract of Lactobacillus spp. and the effects of types of media and growth phase of the cells on the cellular GSH level have been determined. Correlation between reduced glutathione sulphydryl level and antioxidative ability of Lactobacillus spp. was analyzed: Lactobacillus casei HY 2782 contained 25.15 $\mu$mole/g of GSH, the cellular GSH level of L. casei HY 2782 reached maximum after 24 h of cultivation and tended to decrease on further cultivation up to 72 h. There was a significantly higher level of cellular GSH when grown in de Man Rogosa and Sharpe (MRS) broth than in tryptone phytone yeast extract (TPY) broth or bromcresol pruple dextrose (BCP) broth (p<0.05). The antioxidant activity of cell free extract of Lactobacillus spp. have been shown to be significantly different among strains in the inhibition of linoleic acid peroxidation by thiobarbituric acid (TBA) test (p<0.01). L. casei HY 2782 and L. acidophilus ATCC 4356 revealed a high degree of antioxidative effect in linoleic acid oxidation system. Spearmans' rank correlation coefficient between inhibitory activity on linoleic acid peroxidation and cellular GSH levels of Lactobacillus spp. was 0.65, which means a significant positive correlation.

• Journal of Dairy Science and Biotechnology
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• 제22권2호
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• pp.91-97
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• 2004

활성산소의 세포막 파괴 효과로부터 보호작용과 항산화 활성이 강한 균주를 선별하기 위하여 33균주에 대한 세포네 glutathione 함유율과 linoleic acid 산화억제활성을 측정하였다. Lactobacillus casei CU4114 25.15 umol/g으로 가장 높은 함유율을 보이고 있으며Lactobacillus rhamnosus CU4201, Lactobacillus plantarum CU4203이 14.0umol/g으로 통계적인 유의성을 나타내는 수준으로 높은 함유율을 나타내었다. 포자형 성균주중의 glutathione 함유율 측정 결과 Lactobacillus sporogenes CU4109, Sporolactobacillus inulinus CU4110 은 Bacillus coagulans 균주의 GSH 함유율보다 유의성이 인정되는 높은 함유율을 나타내었다. L. acidophilus CU4111, L. casei CU4114, L. brevis CU4206, L. helveticus Cu4231은 Lactobacillus spp. 중 높은 항산화 활성을 나타내었고 Bacillus coagulans의 항산화 활성범위는 6.02${\sim}$51.72%로 나타났으며 Bacillus coagulans 균주의 항산화 활성이 Lactobacillus spp.의 산화억제활성보다 높은 성향을 나타내었다.

• 한국식품영양과학회지
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• 제30권3호
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• pp.547-551
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• 2001

The comparative activities of acetone, ethanol, and aqueous fractions extracted from fruit powder of Cudrania tricuspidata by different temperature were tested by in vitro experimental models; peroxidation of linoleic acid and autooxidation of rat hepatic and renal microsomes by using thiobarbituric acid (TBA) for assay of free malondialdehyde production, and scavenging activities of free radicals by DPPH (α, α'-diphenyl-β-picrylhydrazyl). In DPPH method, acetone fraction extracted at 30℃ showed the highest free radical scavenging activities and acetone fractions extracted at 30℃ and 60℃ and ethanol fraction extracted at 30℃ showed stronger than BHT (butylated hydroxitoluene) although used ten-fold lower concentrations. In thiocyanate method used linoleic acid an inhibitory effects of all fractions showed higher than control treatment. TBA method used linoleic acid showed the highest antioxidative activity in acetone fraction extracted at 30℃ and 60℃. an inhibition activity against lipid peroxidation in hepatic microsomes of rats showed the highest at acetone faction extracted at acetone fraction among extracted fractions was shown to be the most potent antioxidative properties and this action was more potent in fractions extracted at 30℃ than those extracted at 60℃.

• 한국미생물·생명공학회지
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• 제24권5호
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• pp.591-596
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• 1996

In the course of screening lipid peroxidation inhibitor from basidiomycetes, a mushroom, which was collected at O-Dae mountain in Kangweon- Do, was found to have active compound. The mushroom was identified as Polyzellus multiplex, which belongs to Aphylloporalles Thelephoraceae, on the basis of macroscopic and microscopic characteristics of the fruiting body. The methanol extract of fruiting body was extracted with benzene and ethylacetate, sequentially. By using various kinds of chromatographies, PM1, and PM2 and PM3, were purified from the ethylacetate extract and the benzene extract, respectively. Color reaction and analyses of IR, UV, and NMR spectra indicated that PM1 was a derivative of thelephoric acid, and PM2 and PM3 were linoleic acid and oleic acid, respectively. IC$_{50}$ of PM1 for inhibition of lipid peroxidation was 1.96 ppm and LD$_{50}$ was 500 mg/kg.

• 한국응용과학기술학회지
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• 제33권2호
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• pp.342-351
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• 2016

The bioactive compound and antioxidant property of Korean yam (Dioscorea batatas DECNE.) were studied using in vitro methods. Yam available in Korea was analyzed for lycopene, chlorophyll a, b, tannin, phytic acid and total saponin contents. 70% Methanol, 70% ethanol and chloroform-methanol mixture (CM, 2:1, v/v) were used to extract yam. Then the antioxidant activity evaluated through ferrous ion chelating activity, ${\beta}$-carotene bleaching method, lipid peroxidation inhibition and nitric oxide (NO) radical scavenging activity. 70% Methanol extract showed the highest ferrous ion chelating activity and NO radical scavenging activity. And CM extract was the most effective in inhibition of linoleic acid peroxidation evaluated by ${\beta}$-carotene bleaching assay and lipid peroxidation inhibition assay. Based on the results obtained, yam is a potential active ingredient that could be applied in antioxidation as well as bio-health functional food to take a good part in prevention of human diseases and aging.

• 한국약용작물학회지
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• 제13권5호
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• pp.227-232
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• 2005

The antioxidant effect of methanol extract (ME) and water extract (WE) from Clematis trichotoma was evaluated as primary study to scavenge stable 1,1-diphenyl-2-picrylhydrazyl radicals (DPPH), inhibited iron-induce lipid peroxidation in linoleic acid emulsion, peroxidation of liposome induced by $Fe^{3+}/H_2O_2/ascorbie$ acid, and on $Fe^{2+}/H_2O_2$ induced the mitochondrial lipid peroxidation. In secondary study, five flavonoids as luteolin (1), quercetin (2), apigenin (3), hirsutrin (4), kaempferol-3-O-glucoside were isolated (5). Among them, compounds 1 and 2 showed good activities in all the model systems. Compound 3 exhibited moderate antioxidant activities in both radical scavenging and these lipid peroxidation systems tested. Compound 4 showed significant inhibitions in liposome peroxidation and compound 5 displayed weak inhibition in all four tested systems. All the results presented herein indicate that products of C. trichotoma maybe useful in inhibiting membrane lipid peroxidation and preventing free radical-linked diseases.

• Journal of Dairy Science and Biotechnology
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• 제22권2호
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• pp.99-106
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• 2004

포자형성 유산균주에 대하여 종양세포에 대한 증식 억제 활성과 항산화 활성 및 세포내 glutathione 함유율을 측정하였다. 종양세포에 대한 억제활성은 균주에 따라 큰 차이를 나타내었고 Bacillus coagulans KTCC 3675는 높은 수준의 특이한 수준의 억제 활성을 나타내었고 human lymphoma cell NCLH-1299에 대한 억제 활성은 미약한 수준인 것으로 확인되었다. TBA 방법에 의한 linoleic acid에 대한 항산화 활성은 5~25% 정도의 항산화 활성을 보였고 특별히 높은 수준의 항산화 활성을 보인균주는 Bacillus coagulans KTCC 625, Bacillus coagulans KTCC 1015 및 Lactobacillus sporogens CU 815인 것으로 확인되었다. 포자형성 유산균체 추출액의 linoleic acid과산화 억제 활성과 세포내 glutathione함유율과의 상관계수는 0.78로서 고도의 유의성이 인정되는 상관계수를 나타내었다.

• 한국식품영양과학회지
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• 제39권4호
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• pp.631-636
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• 2010

천연 항산화제를 개발하기 위하여 80% 에탄올을 용매로 환류냉각 추출한 마가렛, 국화 및 낙동구절초의 꽃과 잎줄기(shoot)의 페놀성 물질 함량, DPPH radical과 ABTS radical 소거능, ferrous ion chelating 효과 및 linoleic acid에 대한 지질과산화 억제활성을 측정하였다. 총 폴리페놀 함량, 총플라보노이드 함량, DPPH radical 소거능, ABTS radical 소거능은 국화 잎줄기 추출물에서 가장 높았으며, 특히 국화 잎줄기 추출물의 ABTS radical 소거능은 천연 항산화제인 ascorbic acid와 합성 항산화제인 BHT와 유사하였다. 그러나 $Fe^{2+}$ chelating 효과는 국화 잎줄기 추출물에서 가장 낮았으며, 국화 꽃 추출물에서 가장 우수하였다. Linoleic acid에 대한 지질과산화 억제활성은 마가렛과 국화 잎줄기 추출물에서 가장 우수하였으나, BHT보다 억제활성이 낮았다. 연구의 결과, 국화 잎줄기 추출물은 페놀성 물질 함량 및 radical 소거활성이 우수하여 천연 항산화제로 개발 가치가 매우 높은 것으로 생각되었다. 그러나 금속이온 chelating 및 지질 과산화 억제활성은 다소 낮으므로, 다발적으로 발생하는 산화스트레스를 방지하기 위한 항산화제를 개발하고자 할 때는 국화 잎줄기 추출물과 다른 항산화제를 같이 사용하는 것이 좋을 것으로 생각된다.