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Food science and biotechnology 25건

  1. [국내논문]   Antioxidant Activities of Colored Sweet Potato Cultivars by Plant Parts   피인용횟수: 8

    Boo, Hee-Ock (Biotechnology Industrialization Center, Dongshin University ) , Chon, Sang-Uk (Biotechnology Industrialization Center, Dongshin University ) , Kim, Sun-Min (Biotechnology Industrialization Center, Dongshin University ) , Pyo, Byung-Sik (Biotechnology Industrialization Center, Dongshin University)
    Food science and biotechnology v.14 no.2 = no.62 ,pp. 177 - 180 , 2005 , 1226-7708 ,

    초록

    Antioxidant activity of crude extracts from colored sweet potato cultivars by plant parts such as root, stem and leaf was evaluated. The highest TBARS values were obtained from root samples of sweet patato, and followed by stems and leaves, indicating that leaf sample showed the strongest antioxidant activity. Sweet potato cultivars with yellow flesh and leaf part exhibited strong antioxidant activities. Antioxidant activities of leaf and stem extracts were maintained for 21 days and were a little lower than that of BHT. The DPPH radical scavenging activity was the highest in "Sinhwangmi" leaf, and followed by "Jami" root. Chlorogenic acid was detected as the most abundant antioxidant substance among all fractions. These results suggest that the antioxidant activity of sweet potato differs depending on plant part and cultivar.

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  2. [국내논문]   Effects of Gamma Irradiation and Methyl Bromide Fumigation on the Qualities of Fresh Chestnuts during Storage   피인용횟수: 4

    Kwon, Joong-Ho (Department of Food Science & Technology, Kyungpook National University)
    Food science and biotechnology v.14 no.2 = no.62 ,pp. 181 - 184 , 2005 , 1226-7708 ,

    초록

    Effects of irradiation and fumigation on disinfestation and quality attributes of chestnuts during storage were studied. Fresh chestnuts were exposed to gamma irradiation (0-10 kGy) and methyl bromide (MeBr) under commercial conditions and stored at different temperatures for 6 months. Pest of quarantine importance for chestnuts, Curculio sikkimensis Heller showed 100% mortality by MeBr on 3rd day after fumigation and by irradiation at 0.5 kGy in about 3 weeks at $23{\pm}0.5^{\circ}C$ . Respiration rates of samples one day after treatments increased in proportion to irradiation dose. Respiration pattern of MeBr group was equal to that of 10 kGy-group. Both MeBr and irradiation at 0.25 kGy or higher showed 100% inhibition of sprouting during storage at $5^{\circ}C$ for 6 months. Flesh firmness was significantly reduced by MeBr or irradiation over 5 kGy (p

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  3. [국내논문]   Extraction of Pectinesterase from Jalapeno Chili Pepper (Capsicum annuum) and Its Thermal Stability  

    Mejia-Cordova, Sonia Marisela (Food Research Department, School of Chemistry, Universidad Autnoma de Coahuila ) , Montanez, Julio Cesar (Research and Development Center, Coyotefoods, Biopolymer and Biotechnology Co. ) , Aguilar, Cristobal Noe (Food Research Department, School of Chemistry, Universidad Autnoma de Coahuila ) , Reyes-Vega, Maria De La Luz (Food Research Department, School of Chemistry, Universidad Autnoma de Coahuila ) , Garza, Heliodoro De La (Food Research Department, School of Chemistry, Universidad Autnoma de Coahuila ) , Hours, Roque Alberto (CINDEFI, School of Science, Universidad Nacional de La Plata ) , Contreras-Esquivel, Juan Carlos (Food Research Department, School of Chemistry, Universidad Autnoma de Coahuila)
    Food science and biotechnology v.14 no.2 = no.62 ,pp. 185 - 189 , 2005 , 1226-7708 ,

    초록

    The effect of NaCl solution concentration (from 0 to 3 M) on the extraction of pectinesterase (PE) from jalapeno chili pepper (Capsicum annuum) was studied by determining its solubilization degree from the chili tissue. All concentrations of the salt favored the solubilization of PE in jalapeno chili pepper, compared to that in water. Maximum enzyme activity was obtained with NaCl 2.0 M. The effect of temperature on the PE activity of jalapeno chili pepper in the extracts was also studied. The PE residual activity of jalapeno pepper was 75% after 60 min of incubation at $55^{\circ}C$ and 10% at $75^{\circ}C$ . At $85-95^{\circ}C$ , PE residual activity was 5% after 5 min of incubation.

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  4. [국내논문]   Optimum Conditions for the Extraction of Effective Substances from the Stem of Opuntia fiscus-indica   피인용횟수: 2

    Lee, Gee-Dong (DG- Traditional Bio-Materials Industry Center ) , Kim, Jung-Ok (DG- Traditional Bio-Materials Industry Center ) , Joo, Gil-Jae (Institute of Agricultural Science and Technology, Kyungpook National University ) , Kwon, Joong-Ho (Department of Food Science and Technology, Kyungpook National University)
    Food science and biotechnology v.14 no.2 = no.62 ,pp. 190 - 195 , 2005 , 1226-7708 ,

    초록

    The conditions for the extraction of effective substances from the stem of Opuntia ficus-indica were optimized by a response surface methodology. The total extract yield was maximized under the temperature of $97.77^{\circ}C$ , at a time duration of 145.82 min and a water to sample ratio 16.59 mL/g. Moreover, the optimum conditions for the extraction of effective substances were as follows: $84.95^{\circ}C$ , 156.50 min and a water/sample ratio of 7.46 mL/g for the phenolics content; and $97.11^{\circ}C$ , 139.03 min and a water/sample ratio of 10.91 mL/g for the pectin content. The range of optimum extraction conditions in consideration of the physicochemical properties of the extracts were shown to be as $95-100^{\circ}C$ as the extraction temperature, 120-180 min as extraction time and a water to sample ratio of 5-18 mL/g.

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  5. [국내논문]   Shelf-Life Extension of Rice Cake by the Addition of Persimmon Leaf Tea Powder   피인용횟수: 2

    Kim, Gwi-Young (Department of Food Science and Nutrition, Sangju National University ) , Kim, Jong-Kuk (Department of Food Science and Nutrition, Sangju National University ) , Kang, Woo-Won (Department of Food Science and Nutrition, Sangju National University ) , Kim, Jong-Goon (Culinary and Foodservice Management, Sejong University ) , Joo, Gil-Jae (Institute of Agricultural Science and Technology, Kyungpook National University)
    Food science and biotechnology v.14 no.2 = no.62 ,pp. 196 - 199 , 2005 , 1226-7708 ,

    초록

    Antimicrobial activity of persimmon leaf tea methanol extracts on Klebsiella pneumoniae and Staphylococcus aureus was examined through paper disk diffusion bioassay. K. pneumoniae and S. aureus showed 87.64 and 99.35% growth inhibitions by addition of steamed tea methanol extracts (10 mg/ml), respectively. The number of microorganisms in rice cakes was significantly reduced when leaf tea powder was added during production of rice cakes. Addition of 1% steamed leaf teas to rice cakes decreased the number of microorganisms by over 50%, and over 70% reduction was observed when final 2% (dried weight w/w) steamed leaf tea was added, whereas no significant effect was observed over 2%. These results indicate that different microorganisms were detected from persimmon leaf and rice cake, and persimmon leaf can inhibit normal microbial growth in rice cake.

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  6. [국내논문]   Quercetin Ameliorates NO Production via Down-regulation of iNOS Expression, $NF{\kappa}B$ Activation and Oxidative Stress in LPS-Stimulated Macrophages   피인용횟수: 3

    Cho, Hye-Yeon (School of Food and Life Science, Biohealth Products Research Center and Food Science Institute, Inje University ) , Park, Ji-Young (School of Food and Life Science, Biohealth Products Research Center and Food Science Institute, Inje University ) , Kim, Jong-Kyung (School of Food and Life Science, Biohealth Products Research Center and Food Science Institute, Inje University ) , Noh, Kyung-Hee (School of Food and Life Science, Biohealth Products Research Center and Food Science Institute, Inje University ) , Moon, Gap-Soon (School of Food and Life Science, Biohealth Products Research Center and Food Science Institute, Inje University ) , Kim, Jung-In (School of Food and Life Science, Biohealth Products Research Center and Food Science Institute, Inje University ) , Song, Young-Sun (School of Food and Life Science, Biohealth Products Research Center and Food Science Institute, Inje University)
    Food science and biotechnology v.14 no.2 = no.62 ,pp. 200 - 206 , 2005 , 1226-7708 ,

    초록

    Effect of quercetin on NO production and regulation mode of quercetin on oxidative stress, $NF{\kappa}B$ activation, and iNOS expression, possible mechanisms of NO suppression in LPS-stimulated macrophages were investigated. Treatment of RAW 264.7 cells with quercetin significantly reduced lipopolysaccharide (LPS)-stimulated nitric oxide (NO) production dose-dependently ( $IC_{50}$ , $9.2\;{\mu}M$ ). Expression of iNOS and specific DNA binding activities of nuclear factor kB ( $NF{\kappa}B$ ) were significantly suppressed by quercetin pretreatment. Quercetin reduced thiobarbituric acid-reactive substances (TBARS) accumulation, enhancing GSH level and antioxidant activities of enzymes, such as superoxide dismutase (SOD) and catalase. These results demonstrate quercetin may ameliorate inflammatory diseases by suppressing NO production through inhibition of iNOS expression, $NF{\kappa}B$ transactivation, and oxidative stress, which may be mediated partially by antioxidative effect of quercetin. Thus, quercetin appears to be used as a potential therapeutic agent for treating LPS-induced inflammatory processes.

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  7. [국내논문]   Changes of Cholesterol and Selenium Levels, and Fatty Acid Composition in Broiler Meat Fed with Garlic Powder   피인용횟수: 9

    Kim, Yun-Ji (Korea Food Research Institute ) , Chang, Yun-Hee (Department of Food and Nutrition, Myongji University ) , Jeong, Jae-Hong (Department of Curinary Arts, Ansan Technical College)
    Food science and biotechnology v.14 no.2 = no.62 ,pp. 207 - 211 , 2005 , 1226-7708 ,

    초록

    Effect of garlic on cholesterol and selenium (Se) levels, and fatty acid composition in the broiler chicks (Indian River) fed diet containing 0, 2, 4, 6, and 10% lyophilized garlic powder (GA) for 6 weeks were determined. Supplementation of garlic powder significantly decreased cholesterol level in broiler compared to the control (p 0.05) among treatment groups. Percentages of $C_{16:0}$ and $C_{18:1}$ were gradually decreased ( $C_{16:0}$ ;20.62% of total fatty acid in the control to 17.71 % in 10% GA; $C_{18:1}$ ;34.08% in the control to 30.71 % in 10% GA), while that of $C_{18:2}$ was increased from 28.69% in the control to 35.89% of 10% GA diet (p

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  8. [국내논문]   Antioxidant Activity and Total Phenolic Content of Callistemon citrinus Extracts   피인용횟수: 13

    Park, Young-Ki (Div. Biotechnology, Korea Forest Research Institute ) , Lee, Wi-Young (Div. Biotechnology, Korea Forest Research Institute ) , Park, So-Young (Div. Biotechnology, Korea Forest Research Institute ) , Ahn, Jin-Kwon (Div. Biotechnology, Korea Forest Research Institute ) , Han, Mu-Seok (Div. Biotechnology, Korea Forest Research Institute)
    Food science and biotechnology v.14 no.2 = no.62 ,pp. 212 - 215 , 2005 , 1226-7708 ,

    초록

    Ethanol crude extracts of wood, bark, leaf, and fruit of Callistenwn citrinus were compared for their antioxidant activities based on DPPH (1, 1-diphenyl-2-picrylhydrazyl) radical-scavenging activity and reducing power. Bark extract showed the most potent radical-scavenging activity and reducing power, showing 94.1 and 0.64% at 25 and $100\;{\mu}g/mL$ , respectively. Total phenolic content of the bark extracts (275.0 mg GAE/g) was higher than those of others. Further fractionation of the bark extract using hexane, $CH_2Cl_2$ , and EtOAc showed EtOAc fraction had the highest antioxidant activity ( $IC_{50}\;6.7\;{\mu}g/mL$ ) and reducing power (0.82 at $100\;{\mu}g/mL$ ), with total phenolic content of 611.1 mg GAE/g. Total phenolic contents correlated with antioxidant activity ( $R^2\;=\;0.7061$ ) and reducing power ( $R^2\;=\;0.7399$ ).

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  9. [국내논문]   Prevalence of Antibiotic Resistant Foodborne Bacteria Isolated in Korea   피인용횟수: 1

    Chung, Yun-Hee (Test and Research Center, Korea Consumer Protection Board ) , Kim, Soo-Young (Department of Biological Sciences, Konkuk University ) , Chang, Yun-Hee (Department of Food and Nutrition, Myongji University)
    Food science and biotechnology v.14 no.2 = no.62 ,pp. 216 - 222 , 2005 , 1226-7708 ,

    초록

    This study was performed to determine the antibiotic susceptibility profiles of Salmonella spp., coliforms, Listeria monocytogenes, Staphylococcus aureus and Vibrio spp. isolated from broiler carcasses, aquacultured flounders, hamburgers, and lettuce, which are foods consumed in large quantities in Korea. Salmonella spp. and L. monocytogenes were isolated only from broiler carcasses and Salmonella spp. had a high multidrug resistance rate of 61.1%. Meanwhile, coliforms and S. aureus were isolated from all four foods tested in this experiment. The multidrug resistance rate of coliforms from broiler carcasses was 50%, and that of Vibrio spp. from flounders was 71.4%. The resistance to tetracycline, streptomycin, ampicillin or carbenicillin was common regardless of the kind of food or isolate.

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  10. [국내논문]   Anti-inflammatory Activities of Cinanamomum burmanni Bl   피인용횟수: 3

    Khatib, Alfi (Department of Food Technology and Human Nutrition, Bogor Agricultural University, Indonesia ) , Kim, Mi-Yeon (Department of Food Science and Technology, Kyungpook National University, Korea ) , Chung, Shin-Kyo (Department of Food Science and Technology, Kyungpook National University, Korea)
    Food science and biotechnology v.14 no.2 = no.62 ,pp. 223 - 227 , 2005 , 1226-7708 ,

    초록

    Anti-inflammatory assay was conducted on 20 kinds of traditional Indonesian medicinal herbs using soybean lipoxygenase (SLO) and hyaluronidase (HAse). Cinnamomun burmanni Bl showed highest anti-inflammatory activity. Ethyl acetate fraction from methanol extract of C. burmanni Bl bark showing high SLO inhibitory activity was isolated using silica gel-60 column chromatography. Two compounds were isolated and purified through preparative HPLC. Through analyses of UV, $^1H-NMR$ , $^{13}C-NMR$ , EI-MS and $FAB^+-MS$ , compounds 1 and 2 were identified as coumarin and 2-hydroxy cinnamaldehyde, respectively, among which 2-hydroxy cinnamaldehyde showed SLO inhibitory activity of $IC_{50}\;=\;60\;{\mu}M$ . Both compounds did not exhibit HAse inhibitory activity.

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