• The Korean Journal of Community Living Science
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• v.15 no.2
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• pp.101-107
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• 2004

Many studies have presented results about the antioxidative and antimicrobial activities of Dandelions(Taraxacum officinale). There has yet to be a study which makes comparisons based on the variety or parts of the Dandelion. To compare the physiological activity, antioxidative and antimicrobial activities were measured by using methanol extracts of Korean and Western Dandelions. The Dandelions were taken from Uiryeong in Kyungnam province, and antioxidative and antimicrobial activities of the flower, leaf and root were measured. Antioxidative activities of the methanol extracts were examined with a DPPH test. Antimicrobial activities were examined against 5 microorganisms. Bacillus subtilis and Bacillus cereus served as G(+) microorganisms, while Salmonella typhimurium, Staphylococcus aureus, and Eschrichia coli served as G(-) microorganisms. There was no significant difference in the antioxidative activity of the methanol extracts from leaves and roots between varieties. The antioxidative activity of the flower extracts was higher in the Korean than in the Western samples but the highest level of antioxidant was lower than 70%. No significant difference in antimicrobial activities between the varieties was observed. More research using physiological factors other than antioxidative and antimicrobial activities is needed to identify physiological functions and enhance the utilization of Dandelions.

• The Korean Journal of Community Living Science
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• v.15 no.1
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• pp.85-90
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• 2004

To classify the physiological activity by habitat and part of Dandelion (Taraxacum officinale), antioxidative and antimicrobial activities were investigated from methanol extracts of Dandelion. Dandelion was taken from Uiryeong (in Kyungnam province) and from Seoul, and antioxidative and antimicrobial activities were measured for three different parts of the dandelion: the flower, leaf and root. Antioxidative activities of methanol extracts from Dandelion were examined by a DPPH test, and antimicrobial activities were examined against 5 microorganisms: Bacillus subtilis and Bacillus cereus as G(+) microorganisms, and Salmonella typhimurium, Staphylococcus aureus and Eschrichia coli as G(-) microorganisms. No significant differences were found in terms of antioxidative and antimicrobial activities between the dandelions in Uiryeong and the dandelions in Seoul. Antioxidative activity, however, was higher in the flower of the dandelion, irrespective of habitat. Further research with other physiological factors (besides antioxidative and antimicrobial activities) is necessary to shed light on dandelion physiological function and to enhance the utilization of dandelion.

• Korean Journal of Food Preservation
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• v.8 no.2
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• pp.231-238
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• 2001

The concentrations of total polyohenolic compound from extract of Paulownia tomentosa Stued. were water-soluble extract 7.98%, methanol extract 12.30% and ethanol extract 11.63%. The free radical scavenger activities of three extracts at the levels of 0.5% were higher than that of BHT(butylated hydroxytoluene). In antioxidative activities measured the concentrations of TBARS(thiobabituric acid reactive substances) in tissues microsome induced with Fe$\^$++/ascorbate, the water-soluble extract was errdctively suppressed in liver and spleen. In antioxidative activities determined by thiocyanate method against lipid peroxidation using linoleic acid, the methanol extract showed the higher compared with other extracts, but BHT showed the highest antioxidative activity. These results suggest that fruit extracts of Paulownia tomentosa Stued. showed to have relatively high concentrations of polyphenolic compounds and antioxidative activities.

• Korean Journal of Pharmacognosy
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• v.29 no.1
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• pp.28-34
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• 1998

It has been known that diseases related with aging or cancer result, at least in part, from free radicals, and antioxidants may reduce or prevent the abnormalities associated with free radical formation via its scavenging action. Thus, this study was carried out to investigate the antioxidative and antimicrobial activities of nut species for the purpose of developing antioxidant from natural products. Antioxidant activities of four kinds of nuts such as chestnut, groundnut, walnut and acorn were examined by measuring the radical scavenging effect on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical. The extracts from chestnut hull and acorn barnyard millet showed strong antioxidative activities among 10 samples tested. Because of their highest antioxidative activity among 10 samples, radical scavenging effects of 4 different extract compartments (Hexane, EtOAc, BuOH and $H_2O$ extracts) from chestnut hull and acorn barnyard millet, were further examined by DPPH method. EtOAc and BuOH extracts exhibited antioxidative activities similar to those of natural, tocopherol or synthetic antioxidants, BHA. These findings demonstrates that major fraction of the antioxidative activity of chestnut hull or acorn barnyard millet was the EtOAc and BuOH extract compartments. However, antimicrobial activities against food-related bacteria and yeasts was relatively weak.

• Biomedical Science Letters
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• v.12 no.4
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• pp.393-398
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• 2006

These studies were carried out to characterize the physiological functionalities of Codonopsis lanceolata, Cornus officinalis, and their mixtures. We investigated the antioxidative, fibrinolytic, and ${\alpha}$-glucosidase inhibitory activities of them. The antioxidative activities of Codonopsis lanceoiata and Cornus officinalis were 87% and 90%, respectively. Addition of salt to Codonopsis lanceolata and Cornus officinalis did not affect its antioxidative activities. In spite of fourfold addition of Codonopsis lanceolata to Cornus officinalis, the antioxidative activity was conserved at 90%. The fibrinolytic activities of Codonopsis lanceolata and Cornus officinalis were 0.78 plasmin unit/ml and 1.74 plasmin unit/ml, respectively. Addition of salt decreased the fibrinolytic activities of both Codonopsis lanceolata and Cornus officinalis. A mixture (3:1) of Codonopsis lanceolata and Cornus officinalis exhibited a 21% increase in activity. The ${\alpha}$-glucosidase inhibitory activities of Codonopsis ianceoiata and 100-fold diluted Cornus officinalis were 25% and 73%, respectively. The addition of salt to Codonopsis lanceolata and Cornus officinalis slightly decreased their ${\alpha}$-glucosidase inhibitory activities. According to the addition of Cornus officinalis to Codonopsis lanceoiata, the ${\alpha}$-glucosidase inhibitory activities of the resulting mixture were highly increased. We anticipate that these results will be used as basic data for the development of new bifunctional foods.

• Journal of Dairy Science and Biotechnology
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• v.28 no.2
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• pp.31-39
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• 2010

Lactic acid bacteria (LAB) are typical probiotic microbes which are used in various industries including fermented foods, feed additives, and pharmaceuticals. The purpose of this study was to compare the ability of antioxidative activities of 23 strains of LAB isolated from cheese, kimchi, yogurt, and etc. LAB were tested for antioxidative activities such as 2,2'- azino-bis(3-ethyl-benzothiazoline-6-sulphonic acid) (ABTS) radical scavenging abilities and superoxide dismutase (SOD)-like ability. Antioxidative activities were examined different media such as MRS, M17, and 10% skim milk. Culture supernatant in M17 medium showed a higher antioxidative activity than these in MRS and 10% skim milk. Comparison of ABTS radical scavenging ability by the LAB showed a wide variation with a range from 9~93% and SOD-like ability of LAB ranged from 70~78%, respectively. Therfore, some of LAB can play important roles in the protection for oxidative stress and CPP-producing activity of LAB may be a promising material for application in the dairy industry.

• Journal of the Korean Society of Food Science and Nutrition
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• v.22 no.2
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• pp.246-252
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• 1993

Melanoidins, as brown colored polymers, are formed through the diversified reaction systems of Maillard type and other reactions. Melanoidins are important components in relation to food quality and also are known to have antioxidative, mutagenic and antimutagenic activities. Since these aspects have been extensively reviwed elsewhere, only the recent studies regarding to their antioxidative and antimutagenic activities are discussed in this review. Even though their mechanisms are not clearly identified, melanoidins or specific fractions isolated from their mixtures have shown varied antioxidative activities depending on the reaction systems and reaction conditions. Those activities presumely are derived from the complex functional properties of hydrogen / electron donors and metal chelating power, which are originated from their reductone structure and others. It is considered that pyrolysate and other mutagens are formed by the given conditions in some cases during browning reaction, whereas melanoidins and their fractions have antimutagenic effects on chemical and other mutagens. There are positive correlationship among the color intensity, antioxidative activity and antimutagenicity of melanoidins or their fractions. These suggest that the antimutagenicity of melanoidins could be attributed to their antioxidative properties, however, it might also be due to other factors, because the relevant responses for antimutagenicity are very complicate and not clear. Accordingly, further studies are required to determine the actual acitivities and mechanisms involved in antioxidation and (anti)mutagenicity of melanoidins by reaction systems / conditions and by the isolated fractions. And also, additional studies are needed to evaluate the applications of melanoidins and their relevant effects to food and human health.

• Korean Journal of Community Nutrition
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• v.9 no.4
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• pp.536-544
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• 2004

To evaluate the antioxidative effect of maengjong-juk (Phyllostachys pubescens) extract coated rice in vivo system, maengjong-juk extract coated rice diets were fed to C57BL/6 mice for 16 weeks. Plasma total antioxidative capacity, hepatic lipid peroxidation, protein oxidation, activities of antioxidative enzymes and total glutathione content were measured. Plasma total antioxidative capacity was elevated significantly in maengjong-juk extract diets supplemented group in a dose dependant manner. Hepatic TBARS contents were significantly decreased in maengjong-juk extract diets supplemented group compared to high cholesterol group. Maengjong-juk extract coated rice diets suppressed the protein oxidation significantly in liver. Activities of hepatic antioxidative enzymes such as total SOD, CuㆍZn-SOD, Mn-SOD, GSH-Px and catalase activities of maengjong-juk extract coated rice diets were significantly higher than those of high cholesterol diet. Total hepatic glutathione content was significantly increased by maengjong-juk extract coated rice diets administration. According to this study, numerous antioxidative materials and phytochemicals containing in maengjong-juk extracts appear to protect antioxidative systems in C57BL/6 mice fed bamboo extract coated rice diet. (Korean J Community Nutrition 9(4): 536∼544, 2004)

• Preventive Nutrition and Food Science
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• v.14 no.4
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• pp.323-328
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• 2009

Cryotin F could be used for hydrolyzing shrimp byproducts into bioactive ingredients, which could be used as value-added products. The objective of this study was to investigate the optimum condition for antioxidative activities of the enzymatic hydrolysate produced with Cryotin F using response surface methodology with central composite rotatable design. Shrimp byproducts (shells and heads) were hydrolyzed with Cryotin F. The experimental ranges of the independent variables for 20 experimental runs were 28.2-61.8${^{\circ}C}$ reaction temperature, pH 6-10 and 0.5-5.5% enzyme concentration. The degree of hydrolysis for the reaction products was measured. Their antioxidative activities were measured using 1,1-diphenyl-2-picryl-hydrazyl (DPPH) scavenging activity and Fe-chelating activity. The experimental method with central composite rotatable design was well designed to investigate the optimum condition for biofunctional ingredients with antioxidative activities using Cryotin F because of their high R2 values of 0.97 and 0.95 for DPPH-scavenging activity and Fe-chelating activity, respectively. Change in enzyme concentration did not significantly affect their antioxidative activities (p<0.05). Both DPPH scavenging activity and chelating activity against Fe for the enzyme hydrolysates were more affected by the pH of enzyme hydrolysis than by their action temperature. DPPH-scavenging activity was higher at acidic pH than alkali pH, while chelating activity against Few was inversely affected. Hydrolysate of shrimp byproducts showed high antioxidative activities depending on the treatment condition, so the optimum treatment of enzymatic hydrolysate with Cryotin F and other proteases can be applied to shrimp byproducts (shells) and other protein sources for biofunctional ingredients.

• The Korean Journal of Food And Nutrition
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• v.28 no.1
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• pp.9-15
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• 2015

This study was conducted to improve the quality of Wanja-jeon, a Korean traditional food utilizing beef. Antioxidative evaluation of the ingredients in Wanja-jeon showed that soybean powder was highest in DPPH, ABTS radical scavenging activities and in reducing power among the food ingredients tested. Since soybean powder demonstrated high antioxidative activity, beef was replaced with soybean powder in Wanja-jeon to increase the antioxidative activity. All antioxidative activities such as DPPH and ABTS radical scavenging activities as well as reducing power increased with increases in the amount of soybean powder replacing beef. In texture analysis, the hardness, chewiness and brittleness of Wanja-jeon were highest when beef was replaced with 20% soybean powder, whereas the springiness and cohesiveness of the Wanja-jeon were highest with 50% of the beef replaced with soybean powder. The Hunter's color L and b values were highest in Wanja-jeon with 50% soybean powder replacing beef, while the a value of the color was highest in Wanja-jeon with 30% soybean replacing beef.