• Korean Journal of Food Science and Technology
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• v.22 no.2
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• pp.140-144
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• 1990

This study was undertaken to examine if sodium acetate and/or calcium chloride would increase the firmness and/or retard rancidity of Kakdugj (Korean seasoned pickles of cubed radish roots) during short $(at\;20^{\circ}C)$ or long $(at\;4^{\circ}C)$ period of fermentation During the fermentation periods, pH and acidity were higher in Kakdugis containing 0.3 or 0.6% Na-acetate than in the other samples at both storage temperatures. Firmness was increased with addition of 0.05% Calcium chloride and synergistic effect on firmness was observed when Calcium chloride and Na-acetate were added together. Sourness did not decreased in samples containing 0.3% Na-acetate at either fermentation periods but decreased in those containing 0.6% Na-acetate and stored for long. Saltiness was increased slightly with the addition of Calcium chloride. Compression test gave closer result to sensory evaluation than puncture test In the measurement of firmness with Instron.

• Korean Journal of Food Science and Technology
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• v.37 no.4
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• pp.642-647
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• 2005

Lonicerae Flos was extracted with methanol and successively fractionated with petroleum ether, chloroform, ethyl acetate, and methanol to investigate their antimicrobial effects against food-borne pathogens and food spoilage bacteria using paper disc method. Ethyl acetate extracts of L. Flos showed highest antimicrobial activity against Shigella dysenteriae. Synergistic effect in inhibition was observed when L. Flos extract was mixed with Artemisa capillaris extract as compared to using each extract alone. Growth inhibition curves were determined using ethyl acetate extracts of L. Flos against Staphylococcus epidermidis and S. dysenteriae. Ethyl acetate extract of L. Flos had antimicrobial activity against S. dysenteriae at 3,000 ppm, retarding growth of S. dysenteriae up to 12 hr.

• The Korean Journal of Ecology
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• v.28 no.3
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• pp.135-139
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• 2005

This study was carried out to find the allelopathic effect of volatile materials released from Eupatorium rugosum. The GC method was employed for analysis of volatile materials from E. rugosum and 49 chemical substances were identified such as $\beta$-caryophyllene, $\alpha$-terpinenol, chamazulene, bornyl acetate, $\alpha$-pinene, etc. including unidentified three chemicals. Germination test in Phaseolus radiatus was done to find the inhibition effect of volatile materials using some chemicals which were proved to be important component or much amounts ones in E. rugosum. It was strongly inhibited by linalool and terpinen-4-ol. Seedling elongation and radicle growth of that were proportionally inhibited by the concentration of the essential oil, especially $\alpha$-pinene and bornyl acetate. Biomass of receptor plant was slightly decreased more than 58 ${\mu}l$ of the extract in case of $\alpha$-pinene, while it was decreased more than 19 ${\mu}l$ of that in bornyl acetate but it was shown non-significant. From the above results, it was found that volatile materials from E. rugosum showed a allelopathic effect and also $\alpha$-pinene, bornyl acetate, linalool and terpinen-4-ol used in bioassay were some of major allelochemicals in germination inhibition and especially linalool and terpinen-4-ol are prominent effect on growth inhibition of other plant.

• Preventive Nutrition and Food Science
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• v.9 no.4
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• pp.306-311
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• 2004

This study was performed to investigate the antimicrobial effects of Portulaca oleracea extracts against food-borne pathogens. First, the Portulaca oleracea was extracted with methanol at room temperature, and then further fractionated by using petroleum ether, chloroform, ethyl acetate and methanol, respectively. The antimicrobial activity of the Portulaca oleracea extracts was determined using a paper disc method against food-borne pathogens and food spoilage bacteria. The ethyl acetate extracts of Portulaca oleracea showed the highest antimicrobial activity against Staphylococcus aureus and Shigella dysenteriae. There was also a synergistic effect of the combined extracts of Portulaca oleracea and Indigofera kirilowii as compared to each extract alone. Finally, the growth inhibition curve of ethyl acetate extracts of Portulaca oleracea against Staph­ylococcus aureus and Shigella dysenteriae was determined The ethyl acetate extract of Portulaca oleracea showed strong antimicrobial activity against Staphylococcus aureus at the concentration of 4,000 ppm. The 4,000 ppm of ethyl acetate extract from Portulaca oleracea, retarded the growth of S. aureus by more than 24 hand Shigella dysenteriae up to 12 h at $37^{\circ}C$.

• Journal of the Korean Society of Food Science and Nutrition
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• v.33 no.10
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• pp.1601-1605
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• 2004

To develop the functional food, methanol extracts of dried plantain (Plantago asiatica L.) was fractionated in hexane, chloroform, ethyl acetate, butanol and aqueous fraction. DPPH radical scavenging effect, reducing power, nitrite scavenging effect and antimicrobial activities of these fractions were investigated. Ethyl acetate fraction among these fractions showed the highest effect of all experiments. Ethyl acetate fraction showed about 60% scavenging effect on the DPPH radicals at 400 $\mu$g/5 mL. Nitrite scavenging effect of ethyl acetate and butanol fraction was more than 70~80% at concentration above of 500 $\mu$g. Among various solvent fractions from methanol extracts of plantain, ethyl acetate fraction showed the highest inhibitory effect on the microorganism such as Staphylococcus aureus, Bacillus cereus and Vibrio parahaemolyticus at 5 mg/disc.

• Journal of the Korean Society of Food Science and Nutrition
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• v.33 no.7
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• pp.1106-1111
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• 2004

This study was performed to investigate the antimicrobial effect of the Indigofera kirilowii extracts against food-borne pathogens. The Indigofera kirilowii was extracted with methanol at room temperature, and fractionation of the methanol extract from Indigofera kirilowii was carried out by using petroleum ether, chloroform, ethyl acetate, and methanol, respectively. The antimicrobial activity of the Indigofera kirilowii extracts was determined using a paper disc method against food-borne pathogens and food spoilage bacteria. The ethyl acetate extract of Indigo/era kirilowii showed the highest antimicrobial activity against Staphylococcus aureus and Shigella dysenteriae. The water extract of Indigofera kirilowii showed relatively low antimicrobial activity against microorganisms used in this experiment. The synergistic effect has been found in combined extracts of Indigofera kirilowii and Pulsatilla koreana as compared to each extract alone. The growth inhibition curve was determined using ethyl acetate extracts of Indigofera kirilowii against S. aureus and S. dysenteriae. The ethyl acetate extract of Indigofera kirilowii showed strong antimicrobial activity against S. aureus at the concentration of 4,000 ppm. The 4,000 ppm of ethyl acetate extract from Indigofera kirilowii retarded the growth of S. aureus more than 24 hours and S. dysenteriae up to 48 hours. This study showed the possibility of using ethyl acetate extract of Indigofera kirilowii as a material of food preservative.

• Korean Journal of Food Science and Technology
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• v.23 no.1
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• pp.1-5
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• 1991

This study was conducted to examine the effect of the addition of calcium acetate and/or potassium sorbate on the characteristics of kakdugi(Korean seasoned pickles of cubed radish roots) fermented at $20^{\circ}C$ for 4 days or more. The sensory characteristics, pH, titratable acidity, non-volatile organic acids and texture by Instron were measured. The results of sensory evaluation on kakdugi stored at $20^{\circ}C$ for 4 days indicated that firmness, toughness, crispness, sour taste and overall desirability were increased by the addition of calcium acetate. Potassium sorbate was evaluated to decrease the sourness. Titratable acidity, pH and the amount of non-volatile organic acids were higher in samples containing calcium acetate than in other ones. Compression test with Instron gave the similiar result to sensory evaluation in the measurement of firmness. Calcium acetate and potassium sorbate showed synergistic effect greatly on the textural characteristics on kakdugis.

• Environmental Analysis Health and Toxicology
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• v.4 no.3_4
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• pp.77-86
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• 1989

Influences of u-tocopherol on the toxicity of vitamin A acetate in male rats were studied. The obtained results are as follows; 1) The administration of vitamin A acetate 500,000 IU/Kg i.p. twice at 3 days interval decreased the liver weight/body weight and increased the spleen weight/body weight, and increased activities of SGOT and alkaline phosphatase, and also increased BUN and creatinine. 2) ${\alpha}$-Tocopherol administered together with vitamin A acetate as given as the above 1) poteniated the increase of SGOT activity caused by vitamin A acetate and reduced the increase of alkaline phosphatase activity and creatinine which were caused by vitamin A acetate. 3) The administration of vitamin A acetate 500,000 IU/Kg i.p. twice a week for 4 weeks showed remarkable decrease of body weight gain and the effect of it was larger in later stage than in early. It increased significantly liver weight/body weight and further increased the activities of SGOT, SGPT and alkaline phosphatase, and showed no influnence on BUN and creatinine. 4) ${\alpha}$-Tocopherol administered together with vitamin A acetate as given as the above 3) reduced the decrease of body weight gain caused by vitamin A acetate, and potentiated remarkably the increased activities of SGOT and alkaline phosphatase which were caused by vitamin A acetate.

• Korean Journal of Plant Resources
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• v.29 no.2
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• pp.163-170
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• 2016

Antioxidant activity and inhibitory effect on oxidative DNA damage of ethyl acetate fractions extracted from Cone of Red Pine (Pinus densiflora) were investigated to find utilization of Cone, by-product of Red Pine, thrown out after berry shatter, as a new natural plant resource. Cone from P. densiflora was extracted with methanol (MeOH) and separated to petroleum ether, ethyl acetate and water fraction. Among them, ethyl acetate fraction was used. The antioxidant activity was conducted by the 1,1-diphenyl-2-picryl hydrazyl (DPPH) radical, 2, 2'-Azino-bis (3-ethylbenzothiazoline-6 sulfonic acid) diammonium salt (ABTS) radical scavenging assay, Fe²⁺ chelating assay and reducing power assay. The inhibitory effect on oxidative DNA damage was determined by DNA cleavage assay using φX-174 RF I plasmid. The results of DPPH and ABTS radical scavenging activity at 200 ㎍/㎖ of extracts were 86.50% and 95.80% respectively, which were similar figures compared with L-ascorbic acid as control. Fe²⁺ chelating activity was 77.96% and reducing power was 0.77 at 200 ㎍/㎖. Total phenolic component was 27.29±0.3 ㎎/g and Vitamin C content was 1.84±0.1 ㎎/g. Also ethyl acetate fraction from Cone has inhibitory effect, using φX-174 RF I plasmid on DNA cleavage assay. In conclusion, Cone, by-product of P. densiflora, showed high antioxidant activity and inhibitory effect on oxidative DNA damage. Therefore this study suggests Cone, useless by-product, can be developed as a new natural plant resource with lots of utilization such as an effective antioxidant, natural medicine, food, cosmetics and so on.

• Journal of the Korean Society of Food Science and Nutrition
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• v.31 no.1
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• pp.81-86
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• 2002

The present study was conducted to investigate the effect of dietary supplementation of vitamin A or $\beta$-carotene on oxidative damage induced by acute ethanol administration. Sprague-Dawley rats were fed on the experimental diets supplemented with retinyl acetate (2.86 mg/kg diet) or $\beta$-carotene (15.2 mg/kg diet) for 5 weeks. After fed the diet, rats were administered 20% ethanol solution (3g/kg B.W.) acutely. Lipid peroxide values in hepatic tissue, hepatic antioxidative enzyme activities and contents of antioxidative nutrient such as vitamins A and E in serum and hepatic tissue were measured. Hepatic level of malondialdehyde decreased in $\beta$-carotene group compared to the control group. However, there was no significant difference between retinal acetate and $\beta$-carotene groups. Superoxide dismutase activity was higher in retinal acetate group than in the control group. Hepatic glutathione-S-transferase activity of retinal acetate and $\beta$-carotene groups significantly decreased as compared with that of control group. The hepatic content of retinol increased in retinal acetate and $\beta$-carotene groups, especially, in retinyl acetate group. But there was no significant difference in serum content of retinol among the groups. Hepatic content of $\alpha$-tocopherol was significantly increased in retinyl acetate and $\beta$-carotene groups. In conclusion, acute ethanol administration might induce lipid peroxidation, and the dietary supplementation of retinyl acetate or $\beta$-carotene improve partly the antioxidative system through activation of superoxide dismutase and retention of hepatic $\alpha$-tocopherol in ethanol-treated rats.