• Korean journal of food and cookery science
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• v.14 no.1
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• pp.16-20
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• 1998

The antioxidant and synergistic effect of methanol extracts of onion skin were investigated by measuring peroxide value. The inhibitory effects of the extracts against metal catalyzed oxidation were also studied. The antioxidant activity of methanol extract (0.02%) of onion skin was stronger than that of mixed tocopherol or ascorbic acid (0.02%), but weaker than that of BHT (0.02%). However, the methanol extract at the concentration of 0.04% exhibited strong antioxidant effect, comparable to that of BHT (0.02%). The methanol extract showed very strong synergistic effect with the mixed tocopherol. The methanol extracts at the concentration of 0.03% and 0.04% acted as metal deactivator in the presence of FeC1$_3$. As a metal deactivator, methanol extract of onion skin appeared to be more effective than citric acid.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.1 no.1
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• pp.20-28
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• 1995

The conditions of Soxhlet extraction and HPLC analysis were examined for the determination of antioxidants used for polyolefins manufacturing. The extraction with methylene chloride in a Soxhlet apparatus for 10 hours and above provides almost complete recovery of the additives from polyolefins. The determination of the antioxidants including BHT, Irganox 1076, Irganox 1010 and Irgafos 168 could be successfully performed by using reversed-phase HPLC under gradient elution where the baseline separation of all four antioxidants in a single run was possible. In addition, the antioxidants inherently contained in commercial LLDPE and OPP films were identified and quantitatively determined.

• Journal of the Korean Wood Science and Technology
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• v.31 no.5
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• pp.43-48
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• 2003

From the leaves of S. japonica, three compounds were isolated and identified as follows : hypogallic acid, kaempferol and quercetin. The free radical scavenging activities of the isolated compounds were 98.2%, 96.2% and 90.2% at 100 ㎍/ml, respectively. Compound 1 (hypogallic acid) and compound 2 (kaempferol) indicated higher antioxidative activity compared with reference compound, BHT.

• Journal of Nutrition and Health
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• v.31 no.8
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• pp.1355-1364
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• 1998

This study was planned to investigate the effect of 40 plant ethanolic extracts on antioxidant activities in vitro. The total phenolics, $\beta$-carotene, $\alpha$-tocopherol and selenium contents were also determined . Antioxidant activities fo the ethanolic extracts(0.02%, w/w) in the soybean oil were measured both by determining the peroxide value (POV) during 35 days of storage at 4$0^{\circ}C$ in a forced draft air-incubator and by determining changes in conductivity at 11$0^{\circ}C$(Rancimat method.). Soybean oil without any additives was used as a control and that treated with 0.02% BHT was used as a positive control. Based on the POV determination, green tea extract was found to be the most effective in stabilizing soybean oil, then followed by long tea, which both of them showed higher antioxidant activities compared to the BHT treatment. The antioxidant activities of them showed higher antioxidant activities compared to the BHT treatment. the antioxidant activities of coffee, cinnamomi cortex, acanthopanacis cortex, black tea, orange peel , instant coffee, peony and crni fructus extracts were stronger compared to the control .By the Rancimat method, green tea leaf and oolong tea leaf, foxglove, acanthopanacis cortex and peony extracts. Compared to other extracts, green tea leaf, black tea leaf, foxglove, acanthopanacis cortex and peony extracts had stronger antioxidative effects in both the POV and Rancimat methods used in this study. ethanolic extracts which showed the stronger antioxidative effect also has the higher contents of total phenolics, $\beta$-carotene, and/or $\alpha$-tocopherol. The antioxidative effect of ethanolic extracts was found to be due to the combined effect of various antioxidants.

• Journal of Microbiology and Biotechnology
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• v.19 no.8
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• pp.810-817
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• 2009

The effect of cryoprotectants (maltodextrin+glycerol) and cryoprotectants+antioxidant [ascorbic acid and/or butylated hydroxytoluene (BHT)] mixtures on the survival, electrolyte leakage, and lipid degradation of freeze-dried Weissella paramesenteroides LC11 during storage was investigated and compared with that of the control (cells without additives) over a 90-day storage period at 4 or $20^{\circ}C$ in glass tubes with water activity ($a_w$) of 0.23. The survival, electrolyte leakage, and lipid degradation were evaluated through colony counts, electrical conductivity, and thiobarbituric acid reactive substances (TBARS) content, respectively. The fatty acids composition was determined by gas chromatography, in both the total lipid extract and the polar lipid fraction, and compared with that of the control after the 90-day storage period. As the storage proceeded, increases in leakage value and TBARS content, as well as a decrease in viability, were observed. After 90 days of storage, the major fatty acids found in both the total lipid extract and the polar lipid fraction were palmitic (16:0), palmitoleic (16:1), stearic (18:0), oleic (18:1), linoleic (18:2), and linolenic (18:3) acids. The survival, leakage value, TBARS content and 18:2/16:0 or 18:3/16:0 ratio were the greatest for the protected strain held at $4^{\circ}C$. Cells with the cryoprotectants+BHT mixture showed the highest percentage of survival and 18:2/16:0 or 18:3/16:0 ratio in both lipid extracts, as well as the lowest leakage value and TBARS content after the 90-day storage period. Drying cells with the cryoprotectants+BHT mixture considerably slowed down polar lipid degradation and loss of membrane integrity, resulting in improved viability during storage.

• Korean Journal of Food Science and Technology
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• v.36 no.1
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• pp.19-24
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• 2004

Effect of polyphenolic compounds from green tea leaves and surfactant micelles on lipid oxidation in corn oil-in-water emulsion (O/W) wag determined. Concentrations of polyphenolic compound and surfactant in continuous phase of O/W were measured. Particle size of O/W with 17 mM Brij 700 and 5% corn oil increased with increasing concentration of polyphenolic compound (100-200 ppm). Concentration of surfactant in the continuous phase was lower than that of control. Lipid oxidation rates, as determined by the formation of lipid hydroperoxides and headspace hexanal, in O/W emulsions containing polyphenolic compounds decreased with increasing concentration of polyphenolic compounds (100-200 ppm). Inhibition of hydroperoxide and headspace hexanal produced via lipid oxidation by polyphenolic compounds in O/W was BHT>procyanidin B3-3-O-gallate>(+)-gallocatechin >(+)-catechin.

• The Journal of Korean Obstetrics and Gynecology
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• v.20 no.2
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• pp.164-175
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• 2007

Purpose: The purpose of this study was to investigate the relationships between the herbal medicines used for women in puerperium on postpartum care, Kami-Saenghwatang(SHT) and Kami-Bohertang(BHT) and postpartum body composition change. We also examined the influence of gestational age, the number of parity and the route of delivery for gestational weight gain and postpartum weight loss. Methods: 239 women followed by postpartum care center. Variety factor s were conformed and then checked body composition analysis. 8 weeks later, we followed up body composition of 36 women among the former checked. and additionally asked the body weight of another 42 former checked women by telephone call. Results: $Mean{\pm}S.D$(standard deviation) of pre-pregnancy weight is $55.22{\pm}8.98kg$, $Mean{\pm}S.D$ of gestational maximun weight is $69.26{\pm}9.77kg$, $Mean{\pm}S.D$ of weight loss in postpartum 8 weeks(means sub-tract postpartum 1 week weight from postpartum 8 week weight) is $57.86{\pm}8.60kg$. The number of parities had corrrelation with gestational weight gain. Age, number of parities and route of delive were not significantly correlated with postpartum weight loss during 8 weeks after delivery, and also it was not correlated with body water mass, body fat mass, body mass index and body weight on postpartum 8 weeks whether they treated with SHT and BHT. conclusion: It was not correlated with body water mass, body fat mass, body mass index and body weight on 8 weeks postpartum whether they treated with SHT and BHT.

• Food Science of Animal Resources
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• v.23 no.1
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• pp.46-49
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• 2003

Classwort (Salicornia herbacea L.), a halophyte, is a potential functional food resource in Korea. This study was conducted to determine the antioxidant activity of glasswort, as a functional food material, on the lipid oxidation of pork. To compare antioxidant effect of different parts of glasswort, samples such as dried ground leaves, stems, and roots of glasswort were prepared. The antioxidant activity was determined by the TBARS(Thiobarbituric Acid Reactive Substances) method. Freeze-dried leaves of glasswort at 0 day of storage had the lowest TBARS values, suggesting the highest antioxidant effect. But the antioxidative effect of freeze-dried leaves of glasswort was less than that of BHT. At 7 days after storage, however, the values were not different from oven-dried leaves. The oven-dried leaves at 14 days after storing should highest antioxidative activity. In conclusion, antioxidative effect of glasswort was apparently exhibited through measurement of TBARS. Antioxidative effect from ground leaf sample of glasswort harvested in coastal region was the highest, followed by root and stem samples. Glasswort had twice as high antioxidative effect as sea salt and bamboo salt.

• Journal of the Korean Society of Food Science and Nutrition
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• v.35 no.2
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• pp.182-186
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• 2006

This study was investigated on the antioxidative activity of $70\%$ ethanol extracts from lotus (Nelumbo nucifera) leaf. The extraction yields of $70\%$ ethanol extract was $8.16\%$. The extract was further fractionated subsequently by hexane, chloroform, ethyl acetate, butanol and water. Antioxidative activity was examined by electron donating ability (EDA) using DPPH, TBA value, acid value (AV), and peroxide value (POV), in comparison with commercial antioxidants. Butanol fraction showed the highest extraction yields but ethyl acetate fraction showed the highest phenol content. The ethyl acetate fraction showed the highest EDA. The antioxidative activity of ethyl acetate fraction determined by AV and POV in accelerated oxidation condition of lard was similar to that of BHA.

• Korean Journal of Food Science and Technology
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• v.36 no.6
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• pp.905-910
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• 2004

Effects of bamboo smoke distillates (BSD) in oxidative stability of oil during storage were investigated. BSD at 0.1, 0.5, and 1.0% was added to palm oil and lard, and peroxide, acid, and TBA values were measured during storage at $60^{\circ}C$ for 25 days. Induction periods and relative antioxidant effectiveness (RAE) for the oils were also investigated. Antioxidative effect increased with increasing concentration of BSD. Oil with 0.1% BSD had higher antioxidative effect than that with 0.02% BHT and much higher than that with 0.02% ${\alpha}-tocopherol$. Induction periods of lipid oxidation were 34.27 and 25.61 days for palm oil and lard, respectively. In oxidation reaction, palm oil was more stable during storage than lard. When 1.0% BSD was added RAEs of palm oil and lard were 233.92 and 2371.62%, respectively. Palm oil with 1.0% BSD showed higher antioxidative effect than that with 0.02% BHT, and lard showed much higher antioxidative effect than palm oil.