• Korean Journal of Medicinal Crop Science
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• v.13 no.1
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• pp.11-16
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• 2005

Soybean sprouts presoaked to leaf extracts were on sale as taking a growing concern about wellbeing foods. The study was carried out to compare the effects of culture period after presoaking tea (Thea sinensis L.) and hard rubber tree (Eucommia ulmoides Oliver) leaf extracts on lateral root formation, growth and morphological characters of the sprouts. Seeds of three cultivars, Pungsannamulkong, Sowonkong and Junjery, were imbibed for 5 hours into 10% solutions immediately before 5, 6 and 7 day cultures. The cultured sprouts were classified into 4 categories to calculate their composition rates on the base of hypocotyllengths; >7 cm (A),4 to 7 cm (B),< 4 cm (C) and not germinated (D), and their morphological characters, fresh and dry weights were measured. Rate of A was the lowest in Junjery of the three cultivars, while that of C showed reverse result compared to A. Similar results to that of A were observed between the three cultivars in sprout length including hypocotyl and root, diameters in middle and hook parts of hypocotyl, total fresh and dry weights. Regardless of tea and hard rubber tree leaf extract treatments, longer culture periods increased rate of A due to decrements of B, C and D, and also did the growth and the morphological characters mentioned above. Although longer culture periods reduced the increment of lateral roots, the latter treatment was more delayed in their formation and less in the roots per sprout than the former one. The growth and the morphological characters above were less in the latter treatment than in the former one in general, meaning that hard rubber tree leaf extract could more repress growth of soybean sprouts than tea leaf extract.

• Journal of the Korean Society of Food Science and Nutrition
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• v.32 no.2
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• pp.263-268
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• 2003

This study was designed to test the effect of Korean traditional teas on lipid levels in lead (Pb)-administered rats. Male rats were divided into normal, Pb-control (rb-Con) and Pb-water extract of traditional teas (green tea: GWE, persimmon leaf: PWE, safflower seed: SWE, Solomon's seal: SSWE) groups. Pb intoxication was induced by administration lead acetate (25 mg/kg. BW, oral) weekly. The extract was administered based on 1.26 g of raw traditional tea/g BWday for 4 weeks. Net weight gain and feed intake were significantly lower in the Pb-Con group than in the normal group, whereas they were tended to increase by traditional teas supplements. Both Plasma and hepatic total cholesterol and triglyceride concentration were lower in the traditional teas supplemented groups compared to the Pb-Con group. Plasma VLDL-cholesterol and LDL-cholesterol levels were significantly increased by Pb ad-ministration, whereas HDL-cholesterol concentration was significantly lower in the Pb-Con group than in the normal group. However, water extracts of green tea, persimmon leaf, safflower seed and solomon's seal supplementation improved changes of the plasma lipoprotein-cholesterol levels in Pb administered rats.

• Journal of the Korean Society of Food Science and Nutrition
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• v.32 no.2
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• pp.191-196
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• 2003

This study was performed to investigate the effect of water extract of green tea (GT), persimmon leaf (PL) and safflower seed (SS) on heme synthesis and erythrocyte antioxidant enzyme activities in lead (Pb)-administered rats. Male rats were divided into five groups. a normal, Pb-control (Pb-Con), Pb-GT, Pb-PL and Pb-55 groups with ten rats per group. Pb (25 mg/kg. BW) was orally administerd once a day for 4 weeks. The extract of GT, PL and 55 were administered based on 1.26 g of raw traditional tea/kg BW/day. Blood hematocrit, homoglobin level and red blood cell counts were significantly lower in rb-Con group than in normal group. However, the supplementation of GT, PL and 55 were effective to improve the hematological parameters. Plasma AST and ALT activities were significantly lower in Pb-GT, Pb-PL, Pb-SS groups than in Pb-Con group. The $\delta$ -amino-levulinic acid dehydratase (ALAD) activity of blood and liver were significantly lowered in Pb-Con group com-pared to those of the normal group. The ALAD activity in Pb administered rats was recovered to tile normal level by the water extract of GT, PL and 55 supplementation. Erythrocyte superoxide dismutase and catalse activities were significantly higher in Pb-Con group than in normal group, whereas glutathione peroxidase activity was lowered in Pb administered rats. The extract of GT, PL and SS supplement attenuated changes of these erythrocyte antioxidant enzyme activities by Pb intoxication.

• Food Science and Preservation
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• v.30 no.6
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• pp.1043-1055
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• 2023

This study was conducted to suggest an extraction method for preparing the extract from green tea leaves that possess enhanced antioxidant and antibacterial activities. Different ethanol concentrations were tested to recover phenolics and flavonoids, and 50% ethanol was the best under heat treatment (121℃, 15 min). The ethanol extract exhibited excellent DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging activity and growth inhibition against B. cereus, B. licheniformis, S. aureus subsp. aureus, and A. hydrophila subsp. hydrophila. To enhance the antioxidant and antibacterial activities, cell-wall degrading enzymes (2.5% cellulose+2.5% pectinase, v/w dry sample) treatment and Saccharomyces cerevisiae fermentation were applied singly or in combination. The enzymatic treatment of green tea leaves notably increased extraction yield. However, the antioxidant and antibacterial activities of the extract were lower than those of the control (heat-treated 50% ethanol extract). In contrast, the yeast fermentation alone did not affect the yield, but enhanced antioxidant and antibacterial activities, contributing to the increase in the extract's total phenolic and flavonoid contents.

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2003.10a
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• pp.50-52
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• 2003

Mulberry containing many bioactive components is very useful as functional food resource. Mulberry leaf ice cream, mulberry leaf tea, mulberry noodle, mulberry fruit jam, mulberry wine etc. have been developed in Korea. Because mulberry fruit has abundant natural pigments belonging to anthocyanins, we can expect their therapeutic and physiological effects. However, there are few reports about mulberry seed. So we studied on fatty acids of mulberry seed for the purpose of increasing the functional utilization of mulberry fruit. (omitted)

• Proceedings of the Korean Society of Plant Biotechnology Conference
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• 2005.04a
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• pp.176-176
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• 2005

• Proceedings of the Korean Society of Life Science Conference
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• 2005.04a
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• pp.85-85
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• 2005

• Proceedings of the Plant Resources Society of Korea Conference
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• 2005.11a
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• pp.60-60
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• 2005

• Korean Journal Plant Pathology
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• v.13 no.1
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• pp.22-29
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• 1997

Etiological and ecopathological studi88888es on the leaf blight of kiwifruit (Chinese gooseberry), a disease newly found in 1993 in Korea, were carried out in this experiment. The leaf blight symptom was prevalent in the southern area of Chonnam Province where kiwifruits were widely cultivated. The disease occurred from July to fall, causing early defoliation of kiwifruit vines. Small brownish circular or irregular lesions appeared initially on the leaves, starting from the marginal leaf areas, and enlarged. Afterwards small grayish black granules (acervuli) were formed on the lesions. The color of old lesions changed to grayish brown or grayish white. The causal fungus was identified as Pestalotiopsis menezesiana (Bress. & Torr.) Bissett according to its morphological characters and pathogenicity (pathogenic to Chinese gooseberry and grapevine, but not to other hosts of Pestalotiopsis spp.such as tea, apple, persimmon, and chestnut). As P. longiseta and P. neglecta were reported recently in Japan as pathogens causing similar blight symptoms in kiwifruit, P. menezesiana is a new leaf blight pathogen in kiwifruit. Development of the disease was stimulated by wounding, prevailing wind, and drought. The causal fungus was proven to be overwintered in the diseased leaves on the ground surface.

• Food Science and Biotechnology
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• v.15 no.6
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• pp.914-919
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• 2006

We investigated the catechin content in green tea leaf (GTL) and green tea seed (GTS), the antiproliferative and detoxifying phase II enzyme-inducing activities of the methanolic (80%, v/v) extracts from GTL and GTS. GTL and GTS contained $8,685{\pm}1,061$ and $108{\pm}32\;{\mu}g/g$ epigallocatechin gallate (EGCG), $11,486{\pm}506$ and $116{\pm}72\;{\mu}g/g$ epigallocatechin (EGC), $3,535{\pm}308$ and $821{\pm}95\;{\mu}g/g$ epicatechin gallate (ECG), and $1,429{\pm}177$ and $37{\pm}44\;{\mu}g/g$ epicatechin (EC), respectively. The methanolic extract of GTS showed a greater increase in quinone reductase activity and antiproliferation potential against mouse hepatoma cells than GTL extract did. GTS treatment resulted in the accumulation at sub-G1 phase of mouse hepatoma hepa1c1c7 cells as assessed by flow cytometry. Enhancement of phase II enzyme activity by GTS extract was shown to be mediated, directly or indirectly, via interaction with the antioxidant response element (ARE) sequence in the genes encoding the phase enzymes. As the catechin content in GTS was significantly lower than that in GTL, components other than catechins appear to be responsible for the anticarcinogenic activity of the seed. In summary, these results suggest that the 80% methanolic extract of GTS deserves further study to evaluate its potential as an anticarcinogenic agent and to investigate its mechanism of action.