• KOREAN JOURNAL OF CROP SCIENCE
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• v.45 no.4
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• pp.261-266
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• 2000

This study was to investigate antioxidative activity of rice grain using 1, 1-Diphenyl-2-picrylhydrazyl(DPPH) and thiobarbituric acid (TBA) method and germination ability for screening rice varieties with high antioxidative activities on korean native and foreign rice varieties harvested in 1998 and 1999. The average antioxidative activity of foreign rice varieties (DPPH 63.5% and TBA 55.2%) was significantly higher than that of native rice varieties (DPPH 47.2% and TBA 45.6%) on varieties harvested in 1999. The promptness index (PI) of native rice varieties was higher in stored rices for three months (mean PI=160.7) than that of stored rices for a year (mean PI=141.6). On the other hand, the PI of foreign rice varieties was higher in stored rices stored for a year (mean PI=176.7) than that of stored rices for three months (mean PI=157.5). Varieties with high redness of hulled rice (a-value) showed significant lipid peroxidation inhibitory activity to DPPH in a stored rices for a year (r=${0.5744}^**$) and stored rices for three months (r=${0.5630}^**$) . These results indicate that the pigments of hulled rice varieties may play important antioxidative roles and colored rice varieties with higher antioxidative potentials can be developed and also may provide information with rice breeder to breed rice variety with a high antioxidative activity for a rapid screening of a small amounts of a large number of samples using color value.

• Journal of the Korean Applied Science and Technology
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• v.3 no.2
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• pp.35-40
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• 1986

In order to investigate the effect of autoxidized methyl linoleate (AOML) on the lipid metabolism in the mouse, we administered the fixed dosage of AOML to mice onece per day for 20 days by using stomach tube. And the following results were obstained. The amounts of triglycerides, phospholipids, total cholesterol and TBA values in the blood serum of test group were increased more than these of normal group. And according to the electrophoresis, the amount of albumin in test group was increased about 22% in comparision with normal group but the amount of VLDL and LDL was decreased about 70% and 30% respectively. The POV, COV and TBA values in the liver of test group were significantly increased more than these in normal group. And also the amounts of triglycerides, phospholipids and total cholesterol in test group were slightly increased. And the damage of hepatic cells and the accumulation of fats were observed as the morphorogical changes in the liver of test group. Form these results obtained, we conclude that the autoxidized methyl linoleate fed in mice influences at lipid metabolism on the blood and the liver.

• Current Research on Agriculture and Life Sciences
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• v.10
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• pp.11-17
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• 1992

In this study, antioxidative effectiveness of BHA, BHT at 0.02%(w/w) was compared with those of separated free phenolic acid, ester form and insoluble bound phenolic acid which were extracted from 50 g of Terminalia chebula Retz by MeOH/aceton solvents. Antioxidative effectiveness was measured by peroxide values and TBA values for 7 days, storaging respective substrates and contrast tube at $45{\pm}1^{\circ}C$ for 35days. Laboratory tubes was added by BHA, BHT, separated free, soluble and insoluble phenolic acid extracts and peroxide value of contrast tube after 21 day storage were 60, 30, 14, 11, 100. On the other hand, at the same conditions, TBA values of each antioxidants were 0.150, 0.108, 0.105, 0.073, 0.078, 0.185. This results remarkably appeared antioxidative effectiveness in meal soybean oil substrates. Phenolic acid separated and identificated were p-coumaric acid, Ferulic acid, Phloroglucinol, Pyrogallol, Vanillic acid and Caffeic acid.

• Applied Biological Chemistry
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• v.30 no.4
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• pp.328-334
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• 1987

The stability of lipids(Soybean oil & Ramyon lipid) by adding soybean products' extracts and Soybean, Soybean products was investigated, respectively. 1. Ethanolic extracts of defatted Soybean was very antioxidative in soybean oil. Soybean hot water extracts, defatted soybean water extracts and Soyprotein isolate water extracts possess antioxidative activities. But, Fresh Soybean cold extracts don't possess antioxidative activity. 2. The Oxidation of Ramyon Lipids (beef tallow) during storage at $45^{\circ}C$ incubator was effectively surpressed by addition of defatted Soybean hydrolyzate, tempeh (Defatted), Soy protein isolate hydrolyzate. The power of antioxidative activity is this order: Soy protein isolate hydrolyfate> Defatted Soybean hydrolyzate> BHA (200ppm)> Tempeh> Tempeh extracts> Defatted soybean.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.25 no.5
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• pp.406-412
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• 1992

Changes in proximate composition and protein quality were determined to find out appropriate processing conditions of the seasoned and smoked squid(Neon flying squid, Ommastrephes bartrannii). Moisture and crude protein contents were severely reduced (p<0.05), while increasing of fat and ash contents were not apparent. Seasoning and smoking contributed iii enhancing TBA value. Trypsin inhibitor(Tl) content was not increased severely after those processing steps. TI content checked in the all steps of squid processing was not correlated with the TBA value of squid in the same processing step. An improved digestibility and protein efficiency ratio(PER) were observed in the all products except with steak(mechanically soften product) in vitro enzymatic digestibilities of both raw Neon flying squid meats(mantle and arm) were significantly inferior(p<0.05) to other squid species.

• Journal of the East Asian Society of Dietary Life
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• v.6 no.2
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• pp.187-194
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• 1996

Changes of the growth of microorganisms, pH, and TBA values were examined for chickens treated with 5% potassium sorbate, 5% sodium acid pyrophosphate, and mixture of 2.5% potassium sorbate and 2.5% sodium acid pyrophosphate solution during 15 days at 4$^{\circ}C$. Treatment of the mixture solution inhibited synergistically the growth of mesophilic and psychrotrophic bacteria and suppressed effectively enteric bacilli. Potassium sorbate treatment was the most effective on inhibition of the growth of yeast and mold. The extension of lag phase for psychrotrophic bacteria and enteric bacilli was observed by the treatment of the mixture solution of potassium sorbate plus sodium acid pyrophosphate and the potassium sorbate solution. PHs of chickens were increased during the storage, which might induce the decline of antimicrobial effect. Sodium acid pyrophosphate was expected to give antioxidant effect as well as antimicrobial effect for high fat foods because the lowest increase of TBA value for chickens treated nth sodium acid pyrophosphate was measured.

• Korean Journal of Poultry Science
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• v.14 no.2
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• pp.145-151
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• 1987

In order to select the optimum freezing condition for the minimization of physico -chemical changes such as protein denaturation, lipid oxidation and pH change, the effect of freezing rates on the poultry meat quality changes was studied during frozen storage at -20$^{\circ}C$. Results obtained from the experiments are as fellows. When chicken breast and leg meat were frozen at above -3cm/hr or the freezing rate, pH change during frozen storage was minimal Although TBA value and free ratty acids were increased during frozen storage, the effect of freezing rates was different depending on muscle types. In terms of protein extractability, the extractability of salt soluble protein and water soluble protein were the highest at above -3cm/hr of the freezing rate during frozen storage. This trend was more obvious with breast meat than leg meat. Considering the above - described results, above -3cm/hr of the freezing rate seemed to be the optimum freezing condition for chicken meat because or the least pH change, low TBA value and high protein extractability.

• Korean journal of food and cookery science
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• v.13 no.5
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• pp.609-616
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• 1997

The contents of crude lipids of Yackwa was especially high of 24.4%. After 30 days of storage, the acid value, TAB and the carbonyl value were 2.0, 1.3, and 1.4 times higher than the initial storage, respectively. Soaking in syrup prevented moisture loss and the progression from lipid oxidation to quality deterioration, and addition of ginger juice showed the slightly lower in lipid rancidity. When compared with the unsoaked group, the L value of the soaked group were lower during the 30-day storage. As for the textural changes during storage, elasticity and chewiness decreased slightly. It was hypothesized that the textural changes were affected not by the ginger juice or the storage period, but by soaking in syrup.

• Korean Journal of Human Ecology
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• v.13 no.1
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• pp.91-96
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• 2004

Effects of irradiation on physical and chemical properties of chicken were investigated. Chicken was irradiated at dose levels of 0, 0.5, 1, 3 and 5 kGy using Co60 source. Irradiation increased drip loss and TBA value. Irradiation decreased L value, and increased a value and b value, indicating that irradiation made chicken darker, more reddish and more yellowish. Irradiation induced the degradation in salt-soluble protein, not water-soluble protein. Any differences in color, odor and tenderness between irradiated and non-irradiated chicken were not perceived by sensory panels.

• Preventive Nutrition and Food Science
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• v.9 no.2
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• pp.167-173
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• 2004

The aim of this study was to investigate the antioxidant effect of medicinal plants used by diabetic patients. Fourteen medicinal plants were selected and antioxidant activity such as 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity, inhibition effect of linoleic acid autoxidation and low density lipoprotein (LDL) oxidation, thiobarbituric acid (TBA) value were measured. The Cornus officinalis had DPPH radical scavenging activity of 84.79%, which was higher than the 78.79% for $\alpha$-tocopherol. Rosa rugosa Thunberg, Pueraria thundergiana Bentham, Artemisia princeps var. orientalis and Sasamorpha purpurascens Nakai also had high values. Extracts with higher DPPH radical scavenging activities had higher total phenol concentrations, and positive correlations between these parameters were found. Inhibitory activities of linoleic acid autoxidation, LDL oxidation and TBA value, used as indices of oxidative stress, were observed in most of the selected medicinal plants. The highest inhibitory activity for TBA value was observed in the extract of Pueraria thundergiana Bentham. Rosa rugosa Thunberg (75.50 %), Sasamorpha purpurascens Nakai (74.00 %), and Cornus officinalis (73.00 %) all had high antioxidant activity against linoleic acid autoxidation, similar to that of $\alpha$-tocopherol. The same 3 plants also had high in inhibitory activity against LDL oxidation. Therefore, we demonstrated that medicinal plants used as folk remedy by diabetic patients had antioxidant activity. Especially, Rosa rugosa Thunberg, Cornus officinalis, Pueraria thundergiana Bentham, Arlemisia princeps var. orientalis, and Sasamorpha purpurascens Nakai had high phenol concentrations which resulted in high values for DPPH radical scavenging. These same plants exhibited high values for inhibitory activities for TBA value, linoleic acid autoxidation and LDL oxidation, indices associated with lipid peroxidation.