• Title, Summary, Keyword: teas

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The Properties of Livestock Waste Composts Tea Depending on Manufacturing Method and Their Effect on Chinese Cabbage Cultivation

  • Jang, Jae-Eun;Kang, Chang-Sung;Park, Jung-Soo;Kim, Sun-Jae;Kim, Hee-Dong
    • Korean Journal of Soil Science and Fertilizer
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    • v.48 no.1
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    • pp.8-14
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    • 2015
  • Livestock waste compost tea is a liquid extract of compost obtained by mixing livestock compost. In this study, some chemical and microbiological characteristics of compost tea depending on the kind of raw materials used were examined, and several experiments to investigate the practical effects on Chinese cabbage cultivation were conducted. This experiment showed that livestock composts needed to be added into aerated water at the ratio between 1:100 and 1:10 (1 part compost to 10~100 parts water) to produce the high quality compost tea. Compost teas must be aerated more than 24 to 48 hours to be able to support aerobic organisms. In cultivation test with compost teas, swine manure compost teas were made by the extracting ratio of 50x, in the aerated condition for 24 hours in water and oil cake in the extracting ratio of 100x were added as supplements. Following the input of oil cake, the concentration of nitrogen and aerobic bacteria increased. Another experiment was conducted to determine the effect of different swine manure compost teas on plant growth and yield of Chinese cabbage. The fresh yield of Chinese cabbage was higher in the fertigated plots by compost tea with oil cake compared to those of N, $P_2O_5$, $K_2O$ fertilization plot with chemical fertilizer by soil test recommendation (Fert. NPK). The effect of compost tea on growth of Chinese cabbage was largely attributable to the increased number of microorganisms as well as nutrients.

Physicochemical Properties of Powdered Green Teas in Korea (국내 시판 가루녹차의 이화학적 품질특성)

  • Lee, Lan-Sook;Park, Jong-Dae;Cha, Hwan-Soo;Lee, You-Min;Park, Jae-Woong;Kim, Sang-Hee
    • Korean Journal of Food Science and Technology
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    • v.42 no.1
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    • pp.33-38
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    • 2010
  • This study was conducted to compare the physicochemical properties of powdered green teas produced in Korea and Japan including particle size, color, chlorophyll, caffeine and theanine. The average particle size of Korean powered green tea ($14.63-25.39\;{\mu}m$) was similar to that of Japanese powdered green tea ($15.46-21.02\;{\mu}m$). The surface color of shade-cultivated Haenam Green Tea (HN-1) had the highest negative 'a' value, which represents 'green' color. When the TCD (total color difference value) was measured in the samples, HN-1 was most similar to the premium powdered green tea of Japan (JA-1). Domestic shade-cultivated powdered green teas had 1.5-2 times greater chlorophyll content than powdered green teas produced from plants that were not cultivated in the shade. The presence of chlorophyll a resulted in a higher intensity of green color than the presence of chlorophyll b. A significant negative correlation was also observed between the color and the chlorophyll a, chlorophyll b and total chlorophyll contents. Specifically, chlorophyll a had the greatest impact on the green color of powdered green tea. The content of catechins, caffeine and theanine in Korean powdered green teas ranged from 14.679-20.128, 1.496-3.237 and 0.926-1.977 g/100 g, respectively. The caffeine and theanine contents were high in shade-cultivated powdered green teas. Based on the above results, domestic powdered green teas cultivated under shaded conditions had a quality similar to that of medium-quality green teas produced in Japan, and the overall quality of Korean powdered green tea was poorer than that of Japanese powdered green tea.

Analysis of Catechin Contents in Commerical Green Tea By HPLC (시판 녹차중 카테킨의 함량 분석)

  • 최성희;이병호;최홍대
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.21 no.4
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    • pp.386-389
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    • 1992
  • The four main tea catechin components (-)-epicatechin (EC), (-)-epigallocatechin (EGC) , (-)-epicatechin gallate (ECg), and (-)-epigallocatechin gallate (EGCg) were analyzed quantitatively from commerical green teas by HPLC. CATechin of the most amounts in steamed and parched teas was EGcg (steamed 1st : 7.54% , parched 1st : 7.88%). Amounts of catechins decreased in the following order : EGCg > EGC>ECg>EC. Almost same tendency of catechin components change of 1st tea and 2nd tea differed to harvesting time being observed in steamed and parched teas. In 2nd tea, amounts of EGCg increased more than in 1st tea. It seems that this change effects on the quality of tea taste.

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Effect of Korean Traditional Teas on Plasma and Hepatic Lipid Levels in Lead-Administered Rats (한국전통차가 납투여된 흰쥐의 혈장과 간조직 중 지질농도에 미치는 영향)

  • 김덕진;조수열;김명주
    • 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.

A Survey on Pesticide Residues of Commercial Flowering Teas (국내 유통중인 식용꽃차의 잔류농약 실태조사)

  • Park, Jungwook;Lee, Hyanghee;Oh, Musul;Kim, Jongpil;Jang, Taekwan;You, Youna;Ha, Dongryong;Kim, Eunsun;Seo, Kyewon
    • The Korean Journal of Pesticide Science
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    • v.17 no.1
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    • pp.1-5
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    • 2013
  • This study was conducted to the amount of pesticide residue in 21 different kinds of 100 commercial flowering teas. Multi-residue analyses of 203 pesticides was performed using the GC-ECD, GC-NPD, GC-MSD, and LC-MS/MS. Pesticide residues were detected in 4 samples (4%) of which 4 samples (4%) violated the maximum residue limits. 4 samples violating the limit were all imported teas. Pesticides detected were chlorpyrifos, flufenoxuron, lufenuron, pyrimethanil and methoxyfenozide. These results indicate the need of continuous monitoring of pesticide residue needs for safety of flowering teas.

On the Six Kinds of Teas -Part II Koryo Dynasty- (육대(六大) 차류(茶類)에 대(對)하여 -제 2보 고려시대-)

  • Kim, Myong-Bae
    • Journal of the Korean Society of Food Culture
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    • v.4 no.2
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    • pp.155-159
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    • 1989
  • The introduction of six kinds of teas in Koryo dynasty and tea-making in domestic were investigated. The results were certified as follows. 1. Lump-tea was introduced and then also produced in domestic. 2. It is assumed that scented-tea was made from white-tea. 3. It is assumed that strong-tea and large tea were blue tea. 4. Leap-tea, green-tea were druncken at the end of Koryo dynasty.

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On the Six Kinds of Teas -Part III Chosun Dynasty- (육대(六大) 차류(茶類)에 대(對)하여 -제 3보 조선시대-)

  • Kim, Myong-Bae
    • Journal of the Korean Society of Food Culture
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    • v.4 no.3
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    • pp.221-227
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    • 1989
  • The introduction of six kinds of teas in Chosun dynasty and tea-making in domestic were investigated. The results were certified as follows. 1. Jasmine tea, blue tea, black tea which are scented tea were introduced from China, red tea was introduced from Japan. 2. Among them, scented tea, yellow tea, black tea were also produced in domestic.

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Quality Characteristic of Drink and Tea-Bag Processed with Safflower Seed Powder (홍화씨분말을 이용한 음료 및 티백차의 품질특성)

  • Kim, Jun-Han;Choi, Myung-Sook;Moon, Kwang-Deog
    • Korean Journal of Food Preservation
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    • v.7 no.2
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    • pp.171-176
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    • 2000
  • Drink and tea-bag were processed with safflower seed powder. Drinks were processed with 90$^{\circ}$C hot water extraction. Yield, soluble solid, pH and centrifugation residue of drinks were ranged in 79.2~89.3%, 0.6~0.99%, 5.98~6.40 and 1.00~1.18, respectively. Sensory score of overall acceptance in drinks were highest at that of enzyme treated drink. Tea-bag was processed with roasted safflower seed powder, alone(1.2g) and the mixtured tea-bags were consisted of persimmon leaves, pine needle and angelica gigas powder in same amount, respectively. Teas were prepared with extraction at 80$^{\circ}$C water for 2 min. Soluble solid and sensory evaluation score of teas were the highest when the tea was processed with safflower seed alone.

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The Aroma Components of Green Tea, the Products of Mt. Chiri Garden (지리산 녹차의 향기성분)

  • 최성희;배정은
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.25 no.3
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    • pp.478-483
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    • 1996
  • The aroma components of Korean green tea in the south western part of Mt. Chiri prepared by the traditional method from native variety were analyzed using GC and GC-MS. The patterns on GC chromatograms of the three samples from the flushes plucked in early spring were similar, though they are prepared by different producers in the area of Hadong-kun, Kyung sang nam-do. A total of 51 aroma compounds were identified in all samples. Main component in the aroma compounds of these teas were geraniol, benzyl alcohol, 2-phenylethanol, $\beta$-ionone, benzyl cyanide and linalool oxides. The aroma components of green teas manufactured by the different plucking periods were also compared. The amounts of geraniol, typical rose floral aroma were particularly decreased in the final plucking period. The amounts of pyrazines and furfuryl alcohol, typical roasted aroma and nutty aroma were slightly increased in later plucking period.

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