The antioxidant activity of hot water extracts made from Yuza (Citrus junos SIEB ex TANAKA) cultivated in Namhae Changseon, Seolcheon and Idong-myeon was analyzed. The total phenolic compound content was significantly higher in the Seolcheon sample (116.06 mg/100 g) than in Idong or Changseon. Flavonoids and hesperidin contents were not significantly different among samples. The electron-donating ability of the Yuza peel hot water extracts was activated to over 55% in all samples with $5,000\;{\mu}g/mL$ added to the reaction system, with especially high in the Seolcheon sample (85.70%). Also, the reducing powder in $10,000\;{\mu}g/mL$ added to the reaction system was showed significantly higher in the Seolcheon (0.82) than in the other samples. The ABT cation decolorization capacity of Yuza peel extracts was activated to over 50% in all samples when $5,000\;{\mu}g/mL$ of water extracts were added to the reaction mixture, and the activity was the highest (67.59%) in the Idong samples. The nitric oxide scavenging activity was lower than 45% in all samples, with the activity of Changseon significantely lower than the other samples. The antioxidant activity of the $\beta$-carotene linoleic acid system was 33.30~42.22% when $1,000\;{\mu}g/mL$ water extracts was added to the reaction mixtures, of which the activity in the Yuza cultivated in Seolcheon showed the highest.
Journal of the Korean Society of Food Science and Nutrition
/
v.38
no.2
/
pp.201-210
/
2009
This study was undertaken to investigate the quality properties of yakchobugak as affected by lactic acid bacteria and waxy rice paste for improving palatability of yakchobugak of Agastache rugosa. Total sugar contents of lactic acid bacteria-fermenting waxy rice paste gelatinized at $90^{\circ}C$ were higher than that of $70^{\circ}C$. Reducing sugar contents were $2{\sim}5$ times higher in $70^{\circ}C$ waxy rice paste than in $90^{\circ}C$ waxy rice paste and increased as the fermentation progressed. Total acidity of waxy rice pastes gelatinized at $70^{\circ}C$ and fermented for 15 hours were $2.7{\sim}1.3$ times higher than at $90^{\circ}C$, and then Lactococcus lactis had the lowest total acidity during fermentation. Viscosity of fermented paste (VFP) were lower than those of raw paste. VFPs gelatinized at $90^{\circ}C$ were markedly higher than those at $70^{\circ}C$ over 28% concentration. In L. lactis and Lactobacillus plantarum, VFPs fermented for 15 hours were over $2{\sim}3$ times lower than those fermented for 40 hours. Hunter's color lightness (L) and yellowness (b) were decreased according to the elevation of gelatinization temperature and fermentation time. L. lactis and L. plantarum-producing waxy rice pastes were the uniform micell type with a large air-pore size and amorphous micell type with a small air-pore size, respectively. Based on these results, L. lactis was a lower lactic acid-producing bacteria as well as uniform air-pore distribution on waxy rice paste. It was found to be a good sourpaste-fermenting strain for enhancement of quality properties of yakchobugak, as revealed through viscosity, total acidity, Hunter's color b value and scanning electron micrographs.
Cho, Kye Man;Hwang, Chung Eun;Ahn, Min Ju;Lee, Hee Yul;Joo, Ok Soo
Food Science and Preservation
/
v.23
no.2
/
pp.259-266
/
2016
Bitter melon powder (BMP) was used in the preparation of rice nuruk (RN) and makgeolli as one of raw materials. RN containing BMP (BMP-RN) was prepared by adding 0~2.0% (w/w) BMP into rice. Fermentative microbial, and antioxidant characteristics of makgeolli were determined during the fermentation process. pH during fermentation decreased from 4.52 (0% BMP-RN), 4.93 (0.5%), 4.80 (1.0%), and 4.88 (2.0%) on the initial fermentation day (day 0) to 4.15, 4.30, 4.57, and 4.59, respectively, corresponding to increases in acidity from 0.64~0.70% to 1.17~1.28%, respectively. Soluble solid contents increased from an initial 2.2~4.4 g/L (day 0) to 9.0~9.3 g/L, and alcohol level increased up to 13.0% by the end of fermentation (day 7). Soluble phenolic contents increased from 0.92, 1.01, 1.32, and 1.41 mg/mL on day 0, to 1.85, 2.03, 2.24, and 2.48 mg/mL on day 7, respectively, while the levels of 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) diammonium salt (ABTS) radical scavenging activities and ferric reducing/antioxidant power (FRAP) assay increased from 46.95~70.04%, 55.33~74.13%, and 0.629~1.243 on day 0, respectively, to 54.98~83.4%, 70.34~92.39%, and 0.964~1.455 on day 7, respectively. Makgeolli made with BMP-RN had higher soluble phenolic contents and antioxidant activity than those of makgeolli made without BMP-RN. These results suggested that BNP-RN made a functional makgeolli.
Journal of the Korean Society of Food Science and Nutrition
/
v.43
no.3
/
pp.389-396
/
2014
The physiological properties of 70% ethanol extracts from Portulaca oleracea with different extraction methods (reflux extraction, RE; autoclave extraction, AE; low temperature high pressure extraction, LTPE) were investigated. The freeze-dried powder yields of RE, AE, and LTPE were 33.78%, 30.80%, and 11.05%, respectively. The color values of L and b were higher in LTPE, and the chroma values were higher in AE and LTPE compared to RE. The total polyphenolics and proanthocyanidin contents in LTPE were significantly higher than in other extracts. The amount of substances related to flavonoids contents was highest in RE (4.30 mg/g), followed by AE (4.06 mg/g), and LTPE (4.00 mg/g). DPPH radical scavenging ability with a concentration of 500 mg% (w/v) were in the following order; LTPE (88.87%)> RE (83.84%)> AE (80.67%). Further, the reducing power, ABTS radical scavenging ability, and nitrite scavenging activity was observed in the same tendency as seen with the DPPH radical scavenging ability. However, the ferrous ion chelating activity of RE (85.45%) and AE (83.88%) was significantly higher than that of LTPE (75.60%). ${\alpha}$-Glucosidase inhibitory activities of RE and LTPE with a concentration of 100 mg% were significantly higher than AE. Xanthine oxidase, and acetylcholinesterase inhibitory activities of LTPE were higher than the other extracts. These results suggest that the extracts from Portulaca oleracea have the potential to act as functional materials, and components of Portulaca oleracea could be effective in the prevention of Alzheimer's disease, and may be used to develop various functional food products.
Journal of the Korean Society of Food Science and Nutrition
/
v.46
no.9
/
pp.1061-1070
/
2017
This study examined the physicochemical properties and protective effects of Corni fructus treated with pressurized-steam (through $121^{\circ}C$, $1.2kgf/cm^2$, 0.5 h, 1 h, 2 h, and 3 h) against $H_2O_2$-induced cytotoxicity on L132 cells. The color values of the untreated Corni fructus powder were higher than those of Corni fructus after the pressurized-steam treatment (PSC), and those of PSC improved with a decrease in treatment time. At the observation by pressurized-steam treatment for more than 2 h, the color was changed to black, and its gloss was lost. The major constituents in PSC (2 hours) were the total sugar (468.53 mg/g), reducing sugar (385.55 mg/g), and total phenol (37.32 mg/g), respectively. The main components in the free sugars of PSC (2 h) were fructose, glucose, and sucrose, at 207.72 mg/g, 219.40 mg/g, and 4.31 mg/g, respectively. The gallic acid in the phenol compounds and 5-(hydroxymethyl) furfural in the furan compounds of PSC (2 h) improved with increasing treatment time. The main components in iridoid glycoside of PSC (2 h) were morroniside, loganin, and lognic acid, which improved with decreasing treatment time. The L132 cell growth inhibition activities of all the extracts were significantly higher than that of the control. The protective effects against the $H_2O_2$-induced cytotoxicity on L132 cells of PSC (2 h) was 102.82% (at $1,000{\mu}g/mL$) higher than those of the other extracts. This suggests that Corni fructus by PSC is useful for functional food materials in the food industry.
Journal of the Korean Society of Food Science and Nutrition
/
v.36
no.6
/
pp.759-765
/
2007
This study was conducted to analyze the chemical properties of single.harvested pepper (YW211, YW213), and to investigate the change of kochujang quality by the addition of single-harvested peppers. Capsaicinoids content of YW211 was $271.65{\pm}25.10mg/100g$ and ASTA color value of YW213 was $212.71{\pm}2.38$, which were comparatively higher values than commercial red peppers. Mixed red pepper powder used for kochujang production were prepared with various mixing ratios of commercial red peppers (YY & GR) and single-harvested pepper (YW211 & YW213). Capsaicinoids content of YY, $3.98{\pm}0.24mg/100g$, was increased to $52.61{\pm}8.62mg/100g$ by mixing 30% YW211. ASTA color value of GR was $110.63{\pm}1.89$ and was increased to $130.01{\pm}1.31$ by mixing 30% YW213. The pH values of kochujang added YW211 or YW213 were slowly reduced and acidities were increased during fermentation; however, both values weren't statistically different. The contents of amino nitrogen increased until 60 days, and then decreased thereafter. Reducing sugars were increased considerably until 30 days, and reduced slowly after fermentation for 90 days.
Kim, Yang-Hyeon;Hong, Su-Myeong;Son, Kyung-Ae;Lee, Ju-Young;Min, Zaw Win;Kwon, Hye-Young;Kim, Taek-Kyum;Kyung, Kee-Sung
The Korean Journal of Pesticide Science
/
v.16
no.2
/
pp.121-130
/
2012
In analyzing pesticide residue, LLE (liquid liquid extraction) is generally applied as one of the existing methods, but needed quite a lot of organic solvents and analytical apparatuses for the sample pre-treatment. In addition to its long analysis time and complex analytical processes, it is required to develop a more rapid and efficient method at present. In order to establish an economic and simple pesticide residue analytical method, this study carried out a comparative experiment on the existing analytical method with a new sample pre-treatment method named QuEChERS (quick, easy, cheap, effective, rugged and safe), which extracts and refines pesticide components by directly adding solid powder into the sample. Both the two analytical methods showed favorable values of correlation coefficient ($R^2$ > 0.99) of calibration curves. In terms of the detection limit (identification limit), imidacloprid showed 0.02 mg/kg, while the rest of pesticides showed a level around 0.05 mg/kg. The results of this experiment revealed that the recovery of LLE was 92.8-100.9% and the RSD was below 2.5%. On the other hand, the recovery of QuEChERS was 92.2-101.6% and RSD was below 1.9%. As a result of comparing the amount of pesticide residue by the time between the two analytical methods by using Paired t-Test, there was no significant difference between the two analytical methods as the p-value ranged from 0.3148-0.9890. Considering the results of the two methods, the QuEChERS method had similar recovery, compared to the analytical method using the existing LLE, and the analytical time was shortened by about one fourth of that of the existing method. Moreover, since it excludes the use of harmful organic solvents like dichloromethane during the process of extraction, thus leading to protecting experimenters health and remarkably reducing the amount of disused solvents, it is judged as an echo-friendly and economic analytical method.
Journal of the Korean Society of Food Science and Nutrition
/
v.16
no.3
/
pp.35-39
/
1987
The present study was attempted to obtain the basic data concerning a reasonable preparing method and the optimum fermentation conditions of Kochujang (Red pepper paste). To establish the standard qualify of Kochujang, changes of the chemical composition and the numbers of bacteria and feasts in Kochujang during fermentation were observed. Moisture, salts and crude ash contents of Kochujang were not changed significantly during fermentation. Titrable acidity and amino nitrogen gradually increased with the time-passed, whereas crude fat gradually decreased with the time-elapsed. And reducing sugar and total nitrogen increased until 40 days, but slightly decreased after this period. The numbers of bacteria and yeasts in the ingrients for the preparation of Kochujang were $3.9{\times}10^7/g$, $1.5{\times}10^3/g$ in red pepper powder, $7.6{\times}10^4/g$, $2.8{\times}10^2/g$ in salts. respectively, but those of sugar and malt were not more than 100/g. Microbial counts in Kochujang during fermentation increased until 40 days, but those are gradually decreased after that.
Journal of the Society of Cosmetic Scientists of Korea
/
v.43
no.3
/
pp.211-221
/
2017
This study was performed to investigate the functional properties and characteristics of Dolnamul (Sedum sarmentosum) as a cosmetic ingredient. Lyophilized sedum powder was extracted with ethanol and stored at $-20^{\circ}C$ for the following experiments. Total polyphenol compounds of the ethanol extract of sedum (SE) was $27.98{\pm}0.34g/kg$(dry weight): epicatechin ($162.14{\pm}5.07mg/kg$), epigallocatechin ($55.99{\pm}2.49mg/kg$), and kaempferol ($47.96{\pm}3.02mg/kg$) were contained in the SE. The SE had organic radical scavenging capacity ($78.43{\pm}1.08%$) and metal reducing power (FRAP value $2.54{\pm}0.12$). FTC and TBARS assays confirmed that the SE inhibited the early stage of lipid peroxidation ($62.03{\pm}0.38%$) as well as the final stage of lipid peroxidation ($55.36{\pm}2.05%$), respectively. The SE (5 mg/mL, dry weight) was proved to have antibacterial effect on the growth of Propionibacterium acnes. The inhibitory percentages of the SE on elastase and collagenase activities were $38.94{\pm}7.09%$ and $78.94{\pm}2.49%$, respectively. Compare to the control group, the SE treated group induced an increase of Col3A1 expression and collagen production ($58.11{\pm}1.07%$). The oil in water emulsion (0.5% SE adding group) showed pH 6.88 and 1.47 g/mL of density. The hardness changes of the SE adding emulsions were not detected during the stored periods at various temperatures ($-20-45^{\circ}C$) for four weeks. It is considered that the SE has antibacterial, antioxidant, and antiaging activities.
Kim, Dong-Myong;Kang, Ho-Chang;Cha, Hyung-Joon;Bae, Jung Eun;Kim, In Seop
Korean Journal of Microbiology
/
v.52
no.2
/
pp.140-147
/
2016
A process for manufacturing virally-safe porcine bone hydroxyapatite (HA) has been developed to serve as advanced xenograft material for dental applications. Porcine bone pieces were defatted with successive treatments of 30% hydrogen peroxide and 80% ethyl alcohol. The defatted porcine bone pieces were heat-treated in an oxygen atmosphere box furnace at $1,300^{\circ}C$ to remove collagen and organic compounds. The bone pieces were ground with a grinder and then the bone powder was sterilized by gamma irradiation. Morphological characteristics such as SEM (Scanning Electron Microscopy) and TEM (Transmission Electron Microscopy) images of the resulting porcine bone HA (THE Graft$^{(R)}$) were similar to those of a commercial bovine bone HA (Bio-Oss$^{(R)}$). In order to evaluate the efficacy of $1,300^{\circ}C$ heat treatment and gamma irradiation at a dose of 25 kGy for the inactivation of porcine viruses during the manufacture of porcine bone HA, a variety of experimental porcine viruses including transmissible gastroenteritis virus (TGEV), pseudorabies virus (PRV), porcine rotavirus (PRoV), and porcine parvovirus (PPV) were chosen. TGEV, PRV, PRoV, and PPV were completely inactivated to undetectable levels during the $1,300^{\circ}C$ heat treatment. The mean log reduction factors achieved were $${\geq_-}4.65$$ for TGEV, $${\geq_-}5.81$$ for PRV, $${\geq_-}6.28$$ for PRoV, and $${\geq_-}5.21$$ for PPV. Gamma irradiation was also very effective at inactivating the viruses. TGEV, PRV, PRoV, and PPV were completely inactivated to undetectable levels during the gamma irradiation. The mean log reduction factors achieved were $${\geq_-}4.65$$ for TGEV, $${\geq_-}5.87$$ for PRV, $${\geq_-}6.05$$ for PRoV, and $${\geq_-}4.89$$ for PPV. The cumulative log reduction factors achieved using the two different virus inactivation processes were $${\geq_-}9.30$$ for TGEV, $${\geq_-}11.68$$ for PRV, $${\geq_-}12.33$$ for PRoV, and $${\geq_-}10.10$$ for PPV. These results indicate that the manufacturing process for porcine bone HA from porcine-bone material has sufficient virus-reducing capacity to achieve a high margin of virus safety.
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