• 한국식품조리과학회지
• /
• 제9권4호
• /
• pp.298-302
• /
• 1993

항산화제가 첨가되지 않은 유지의 $85^{\circ}C$저장중에 과산화물가 측정에 의한 유도기간은 어유, 대두유, 돈지 및 팜유에 대하여 5.0, 17.0, 38.4 및 57.6시간으로 어유의 산화가 가장 먼저 일어났다. Gingerol이 첨가된 각 유지의 상대적항산화 효과는 돈지,대두유, 어유 및 팜유에 대하여 219, 176, 160 및 146%로 나타나 gingerol은 돈지의 산화를 가장 안정시켰으며, 대두유 및 어유에 대하여 BHT보다 산화를 안정시켰다.

• 한국식품영양학회지
• /
• 제14권6호
• /
• pp.527-531
• /
• 2001

옻나무는 독성이 있는 금기물질임에도 불구하고 한국에서는 민간요법으로 옻닭 등의 가공식품 형태로 사용하여 왔다. 항산화 물질은 옻나무 껍질에 물을 가하여 추출하여 분리하였다. 물 추출물은 DEAE, CN, ODS 컬럼을 사용하여 HPLC로 정제하였다. 정제된 순수물질 안정성은 pH 3.0~6.0의 산성영역에서는 안정하였으나, pH 6.5 이상에서는 불안정하였으며, 10$0^{\circ}C$에서 5시간 열처리하여도 80%의 활성을 보였다. 항균력 실험에서는 그람양성, 음성 균주에 대하여 항균 활성이 없었다. 항산화력은 DPPH 방법으로 조사한 결과 동일한 농도에서 (20$\mu\textrm{g}$/m1) BHT, BHC 보다 좋았으나, ascorbic acid 보다 낮았다.

• 한국응용과학기술학회지
• /
• 제4권2호
• /
• pp.25-30
• /
• 1987

In order to investigate the effect to antioxygenic substances in Pine Needles on the photooxidation of linoleic acid (linoleic acid 100mg/10ml ethanol) added antioxidants and antioxygenic substances in Pine Needles was irradiated by the tungsten lamp attached with red fitter. The Photo oxidation of linoleic acid (LA) was conformed with Lea method and rhodan method. The following results were obtained: 1. Photooxidation of LA was greatly increased the presence of photosensitizer. However the Photo oxidation of LA without photosensitizer was smoothly increased by the irradiation. 2. The Photo oxidation of LA without irradiation occured quite lately whether photosensitizer was present or absent. 3. Photooxidation of LA under the presence of photosensitizer was inhibited by the addition of $dl-{\alpha}-tocopherol$ and the acetone fraction of methanol extract of Pine Needles but inhibited by BHT. Photooxidation of LA increased gradually as the addition of BHT increased but decreased gradually as that of acetone fraction increased.

• Journal of Applied Biological Chemistry
• /
• 제42권1호
• /
• pp.40-44
• /
• 1999

The in vitro antioxidative activities of the 33 plant-derived essential oils and 37 phytochemicals including 3 Mentha arvensis leaf-, 2 Thymus vulgaris leaf- and 2 Syzygium aromaticum flower-derived isolates were determined by the inhibition of linoleic acid autoxidation, the generation of superoxide anion and scavenging of DPPH radical. They were then compared to those of the widely used plant-derived antioxidants (pyrogallol and quercetin) and synthetic antioxidant BHT. At a concentration of 0.01%, potent antioxidative effect was observed in the essential oils from Cinnamomum cassia roots, Mentha arvensis leaves, Ginkgo biloba fruits, and Syzygium aromaticum flowers. Of the phytochemicals used, eugenol and isoeugenol at 0.01% showed potent antioxidative activity, and their activities were comparable to those of pyrogallol, quercetin, and BHT. The Cinnamomum root-, the Mentha leaf-, the Ginkgo fruit-, and the Syzygium flower-derived materials may be a good source for an alternative to the currently used antioxidants.

• 한국응용과학기술학회지
• /
• 제10권1호
• /
• pp.103-109
• /
• 1993

Acornic powder was extracted with methanol and ethylacetate to obtain a crude acornic compounds. And they were examined concerning their antioxidant activities for linoleic acid. The results were as follows: 1. Hydrogen donating activity for DPPH was higher in 100ppm acornic compound than 100ppm BHT and 100ppm ${\alpha}$-tocopherol. 2. When the 100ppm acornic compound was added to linoleic acid, which was heated at $50^{\circ}C$ for 48 hours, antioxidant activities by POV and TBA was higher than that of 100ppm ${\alpha}$-tocopherol, but the effect was almost the same as the 100ppm BHT. 3. Antioxiodant activity of acornic compound showed synergistic effect along with malic acid, citric acid, tartaric acid, alanine, arginine, histidine, lysine-HCl, galactose, maltose, glucose and sucrose. 4. Acornic compound inhibited peroxidation of linoleic acid induced by heavy metals.

• Elastomers and Composites
• /
• 제18권4호
• /
• pp.140-147
• /
• 1983

The purpose of this dissertation is to increase oxidation resistance for Polybutadiene & Polyisoprene, and to investigate the energetics of inhibited oxidation of Polybutadiene & Polyisoprene stabilized with various types of antioxidants using DSC. The results of the study are as fellows: 1. In the DSC SCREEN for the onset temperature of oxidation, Polybutadiene was faster than Polyisoprene for the samples containing no antioxidant in air. 2. In the DSC evaluation for Polybutadiene, Recipe BG-4 with 2.0phr compounds of antioxidant was the best effective, and Recipe BS-4 with 2.0phr compounds of antioxidant was the worst effective, and the degrees of effect of antioxidant were exhibited in the ranking of G-1, D, BHT, and SP, roughly. 3. In the DSC evaluation for the Polyisoprene, Recipe IG-4 with 2.0phr compounds of antioxidant was the best effective, and Recipe ID-4 with 2.0phr compounds of antioxidant was the worst effective, and the degrees of effect of antioxidant were exhibited in the ranking of G-1, SP, BHT, and D roughly. 4. In the study on enthalpy which depends on exothermal reaction, the enthalpy of Polyisoprene was gloater than that of Polybutadiene. However, the problem was not solved completely, and it needs further studies.

• 동아시아식생활학회지
• /
• 제4권3호
• /
• pp.97-102
• /
• 1994

The oxidative stability of perilla oil were examined by measuring peroxide value. The induction period of perilla oil for each storage temperature was measured by POV and indicated that it was 80 days for 45$^{\circ}C$, 22.5 days for 65$^{\circ}C$, 9.5 days for 85$^{\circ}C$ and 5 days for 105$^{\circ}C$ respectively. Also, the induction period of the perilla oil with different concentration of ginger powder at 85$^{\circ}C$was studied and has been found that 9.4 days for 6% ginger powder, 11.9 days for 4% and 11days for 2% ginger power. The relative antioxidant effectiveness of ginger power was 99% for 6% ginger power, 125% for 4% ginger power, 122% for 2% ginger power. The induction period of perilla oil with gingerol at 85$^{\circ}C$ was 13.5days for 2% crude gingerol, 11.7days for 0.2% crude gingerol and 12.0 days for 0.02% BHT. The elativi antroxidant effectiveness of perilla oil gingerol at 85$^{\circ}C$was 142% for 2% crude gingerol, 123% for 0.2% crude gingerol, 126% for 0.02% BHT.

• 동아시아식생활학회지
• /
• 제22권3호
• /
• pp.392-400
• /
• 2012

The purpose of this study was to analyze the physiological activity and antibiosis of mulberry powder by extract method. The total phenol content of mulberry powder extracted with methanol was 82.9 mg/g, while that of powder extracted with water was 46.9 mg/g. Extractions with methanol were therefore more effective than with water. The total flavonoid contents of mulberry powder extracted with methanol was 13.0 mg/g, while that of powder extracted with water was 9.4 mg/g. Also, the nitrite-scavenging ability of mulberry powder was lower than ascorbic acid and BHT. The SOD-like activity of mulberry powder extracts, natural antioxidant, and artificial antioxidant at 5 mg/mL arranged in order of decreasing concentration were ascorbic acid (98.3%) > BHT (88.1%) > water extract (9.8%) > methanol extract (3.0%). And, the OH radical scavenging activities of mulberry powder extracts and natural antioxidant at 5 mg/mL in order of decreasing concentration was ascorbic acid (97.0%) > methanol extract (46.2%) > water extract (35.8%). The antimicrobial effects of mulberry powder extracted with methanol could be detected on Bacillus cereus ($10,000{\mu}g/disc$) and Staphylococcus aureus ($10,000{\mu}g/disc$).

• Preventive Nutrition and Food Science
• /
• 제11권1호
• /
• pp.6-9
• /
• 2006

This study was conducted to evaluate the antioxidant activity of each fraction from Sedum sarmentosum. Antioxidant activity of each fraction was measured using the DPPH radical assay, the ferric thiocyanate (FTC) method, and thiobarbituric acid (TBA) method. The antioxidant activities were then compared with that of BHT(synthetic antioxidant). The ethyl acetate and butanol fractions were found to have significant DPPH radical scavenging activity, with scavenging potencies showing 90.61 % and 87.02%, respectively. Total phenolic compound contents, determined according to the Folin-Denis method, were found to be in the order of ethyl acetate>butanol>ethanol>chloroform>aqueous fraction. From the results, we have been able to establish a positive correlation between the antioxidant activity and the total phenolic compound content of the sample. The antioxidant activity in a linoleic acid system was measured using the ferric thiocyanate (FTC) method and thiobarbituric acid (TBA) method. The ethyl acetate fraction had the highest antioxidant activity among the tested fractions. On the basis of these results, the ethyl acetate fraction provided equivalent or higher antioxidant activity as compared to BHT. These results suggest that Sedum sarmentosum is a potentially useful antioxidant for foods, cosmetics, and medicine.

• 임산에너지
• /
• 24권2호
• /
• pp.24-30
• /
• 2005

향나무 잎을 채취하여 분쇄한 후 MeOH로 추출하고 분획한 다음 EtOAc 및 수용성 화합물을 칼럼크로마토그래피법을 사용하여 4개의 화합물 (+)-catechin (1), (-)-epicatechin (2), myricitrin (3) 및 hinokiflavone (4)을 단리하였다. 단리 화합물은 NMR 및 질량분석기를 사용하여 그 구조를 구명하였으며 DPPH radical 소거법을 이용하여 항산화 활성 검정을 시행하였다. 4가지 화합물 모두 우수한 활성을 보였으며 화합물 1, 2 및 3은 대조구로 사용한 ${\alpha}-tocopherol$, BHT 및 curcumin 보다 우수하였으나 화합물 4는 대조구보다 약간 낮은 활성을 나타내었다.