• 한국식품영양과학회지
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• 제34권6호
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• pp.869-874
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• 2005

녹차 및 발효정도에 따른 약발효차, 중발효차, 홍차 가루를 첨가하여 제조한 식빵의 일반성분, 수분결합력, 무게, 부피, 색도, texture 및 관능검사 측정한 결과는 다음과 같다. 차가루 첨가식빵의 수분함량은 $36.02\~36.44\%$로 대조구 $36.98\%$와 거의 차이가 없었다. 조단백질과 회분 함량은 대조구보다 차첨가구가 높게 나타났다 수분결합력은 녹차 첨가구가 가장 높았고, 발효차 첨가구, 대조구 순으로 높게 나타났다 식빵의 부피와 비용적은 대조구가 가장 높게 나타났고, 발효 차 첨가구, 녹차첨가구 순으로 높게 나타났다. 색도는 대조구에 비하여 발효가 많이 진행된 차가루를 첨가한 식빵일수록 L값은 낮고, a값과 b값은 높게 나타났다. 식빵의 견고성은 발효가 많이 진행된 차가루 첨가구일수록 높게 나타난 반면, 응집성은 발효가 많이 진행된 차가루를 첨가할수록 낮게 나타났다 접착성과 씹힘성은 홍차가루 첨가식빵이 가장 높았다. 관능검사 결과, 색깔, 외관, 질감은 대조구가 가장 높은 기호도를 보였고, 향미와 맛은 녹차 및 약발효차 가루 첨가구의 기호도가 높았으며, 전체적인 기호도는 약발효차 가루 첨가구의 선호도가 가장 높게 나타났다.

• Journal of Nutrition and Health
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• 제34권5호
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• pp.525-531
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• 2001

The present study investigated the protective effects of green tea against acute ethanol-induced lipid peroxidation and the change of antioxidative enzyme activities in various regions of rat brain : cortex, cerebellum, striatum and hippocampus. The following parameters were examined : malondialdehyde(MDA) levels and activities of superoxide dismutase(SOD), catalase and glutathione peroxidase(GSH-Px). Male Sprague-Dawley rats were given the experimental containing 1% green tea powder or control diet for 4 weeks, and at the end of feeding diet group received acute ethanol(5g/kg body weight) or equicaloric sucrose solution intragastrically. Green tea powder significantly decreased MDA levels in the striatum compared to control-non alcohol treated group to 1% green tea-non alcohol treated group without altering the antioxidative enzyme activities. Green tea resulted in a significant increase in GSH-Px activities in the hippocampus compared to either control-non alcohol treated group(0.043units/mg protein) or 1% green tea-non alcohol treated group(0.071units/mg protein). In conclusion, these results suggest that moderate consumption of green tea leaves can exert protective effects against ethanol-induced oxidative stress in brain regions, by reducing MDA concentrations in the striatum and enhancing GSH-Px activities in the hippocampus. (Korean J Nutrition 34(5) : 525∼531, 2001)

• 동아시아식생활학회지
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• 제11권4호
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• pp.305-314
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• 2001

The study was conducted to investigate the effect of added green tea and black tea powder on the quality of bread during storage. Tea bread was prepared with 0.1% and 2% concentration of green tea (GT) and black tea(BT) powder. The crude fat contents of GT 2% group and BT 2% group were significantly higher than those of control group. GT l% group and BT l% group. The loaf weight of the control group was the lowest and its loaf volume was the highest. Especially, GT 2% group had the lowest loaf volume. The internal lightness value of control group was the highest. the redness value of BT 2% group and the yellowness value of GT 2% group were the highest. GT 2% group was significantly higher in hardness and gumminess and BT l% group was higher in cohesiveness and springiness. After 5 day storage, the retrogradation of GT 2% group was the highest and that of BT 2% group was the lowest among groups. After 5 day storage. pH. titratable acidity and total colony count of GT 2% group was the lowest and those of control group was the highest. The sensory score of control, GT l% and GT 2% group were evaluated higher than others. The shelf-life of tea breads were prolonged to 1~3 days by adding green tea powder and black tea powder as compared with the control group. but It must be considered the way to increase the quality of bread in loaf volume and retrogradation.

• 동아시아식생활학회지
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• 제23권5호
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• pp.533-545
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• 2013

A type of Korean traditional cookies, yackwa is composed of ingredients which serve as good medicine to people. Further, it has a priceless value and possibility to be a healthy functional dessert. For this study, we developed variable yackwa, containing red-ginseng powder and green tea powder, in order to target the foreign market as well as to investigate the perception and preference of yackwa. The test sample for the control group, yackwa is made of flour, sugar, baking powder, sesame oil and alcohol. For the experimental group, yackwa contains red-ginseng and green tea powder (3, 6, 9, 12%). The investigation period was May 14th, 2013 and the total number of participants was 100. The investigation applied a consumer survey method by filling out a questionnaire while tasting 9 kinds of yackwa samples. They were used for frequency, one-way ANOVA and Pearson's correlation analysis with SPSS 19.0. In the yackwa perception survey, the result indicated that 52.0% of the customers replied 'Do not know well' and 'Do not know at all' which conveys that the perception of yackwa is very low. In contrast, the perception of the red-ginseng and green tea which are functional ingredients is high and the customers tend to prefer the taste and flavor of green tea than red-ginseng. And they prefer the yackwa containing 3% of red-ginseng and green tea powder compared to other ratio contents in the overall preference, color, taste, flavor, odor, degree of greasiness and texture. When people who have a higher perception of yackwa, they tended to prefer the color of red-ginseng yackwa and dislike the color of green tea yackwa. And the more people prefer the taste of green tea, the higher in overall preference, color, taste, flavor, and odor preference.

• 동아시아식생활학회지
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• 제23권6호
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• pp.713-722
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• 2013

The purpose of this study was to examine the effects of dietary green tea powder supplementation on bone metabolism in streptozotocin-induced diabetic rats. Thirty-two male Sprague-Dawley rats (body weight $210{\pm}3g$) were divided into two groups, diabetic and non-diabetic groups. Each group was randomly divided into two subgroups which were fed with the control and 1% green tea powder diets. The serum and urine concentrations of calcium and phosphorus were determined. Serum osteocalcin and ALP and urinary DPD crosslinks value were measured in order to monitor bone formation and resorption. Bone mineral density (BMD) and bone mineral content (BMC) were estimated using PIXImus in the spine and femur. Body weight gain and FER were lower in the diabetic group than in the non-diabetic group regardless of diets. The serum concentration of calcium and phosphorus were not changed among all groups. Urinary calcium and phosphorus excretion were higher in the diabetic group than in the non-diabetic group regardless of diets; however, they were not significantly different by green tea powder intake. Serum alkaline phosphatase (ALP) was increased in the diabetic group than in thenon-diabetic group. Further, there were no significant differences in serum osteocalcin and urinary deoxypyridinoline crosslinks value among all groups. The levels of spine and femur bone mineral density of the diabetic group were significantly lower than that of the non-diabetic group. Within the diabetic group, spine BMD was significantly higher in rats fed with the green tea powder diet than in rats fed the control diet. Therefore, this study suggests that green tea powder has a beneficial effect on bone health, although it is not directly applicable to humans.

• 한국축산식품학회지
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• 제23권4호
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• pp.299-308
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• 2003

돈육소시지에 녹차의 다양한 생리 기능성을 부여하고 소시지의 저장성과 품질을 유지하면서 아질산염의 사용을 감소시킬 수 있는지 알아보기 위하여 녹차 분말을 첨가하여 돈육 소시지를 제조하여 저장 중 품질 특성을 살펴보았다. 아질산염(50, 100, 150 ppm)과 녹차(0, 0.5, 1.0%)를 첨가한 총 9개 시험군의 소시지를 제조하여 1$0^{\circ}C$와 2$0^{\circ}C$에 나누어 저장하면서 아질산염, TBARS와 VBN 등 저장성을 검사하였다. 수분, 조단백, 조지방, 조회분 등 일반성분은 녹차와 아질산염 첨가에 의해 영향을 받지 않았다. 색깔은 녹차 첨가량이 많을수록 밝기와 적색도가 감소한 반면 황색도가 증가하였다. 소시지의 아질산 잔류량을 분석한 결과 아질산염 첨가량이 동일한 경우 녹차 첨가량이 많을수록 아질산 잔류량이 적어 녹차 첨가가 아질산 잔유량 감소에 도움이 되는 것으로 나타났다. 녹차의 첨가는 소시지 제조 초기 및 저장 중 TBARS 값을 유의적으로 감소시켰으며, 이러한 녹차의 TBARS 감소 효과는 낮은 농도의 아질산염을 사용한 경우에 더욱 감소효과가 컸다. 저장 중 휘발성 염기태질소(VBN) 함량도 녹차와 아질산염을 첨가한 군에서 낮은 값을 보였다. 이상의 결과로 보아 돈육소시지에 녹차를 첨가함으로써 아질산 잔류량을 감소시킬 수 있을 뿐 아니라 저장성을 크게 훼손하지 않고 아질산염의 사용을 줄일 수 있다고 사료된다.

• 한국가구학회지
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• 제21권4호
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• pp.284-292
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• 2010

This research was carried out to examine the properties of fancy cherry veneer overlaid on the PF resin bonded Meranti plywood floor, which 2.5% green tea leaf powder was applied in the UV varnishes and the adhesives for scavenging the volatile organic compounds. The results were as follows: 1. The various properties of the treated samples, such as density, moisture content, thickness swelling, bending strength(MOR), adhesion shear strength, surface abrasion, curling, cyclic delamination test with boiling water, boiling property, cold-resistance and heat resistance, acid resistance and alkali resistance, and anti-contamination property showed no significant difference between the properties of the control samples. 2.5% green tea leaf powder treated floor gave a little better results than the control for surface scratch test. 2. In case of QUV and weathering test, no difference between the treated sample and control was found. 3. The floor was discolored by adding 10% green tea leaf powder to UV coating, and the floor was also discolored to light green during by the soaking test. The color of floor was not changed up to 5% addition level.

• 한국식품조리과학회지
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• 제25권2호
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• pp.150-159
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• 2009

The purpose of this research was to improve the quality of Sulgidduk by additions of green tea or rosemary powder to enhance its functional properties and antimicrobial effects. The green tea or rosemary powders were added to the Sulgidduk at different levels (1 or 3%), and color values, textural characteristics, sensory qualities, pH values, and acetic acid values were evaluated. With higher amounts of green tea or rosemary powder, the L-values of samples decreased and a-and b-values increased. Texture profile analyses indicated that hardness was significantly different among all the samples. The sensory evaluation results showed that the 1% addition of green tea or rosemary powder did not cause significant differences in overall acceptability, flavor, or taste. During storage, pH values decreased in all groups and the control group showed the lowest value. Acetic acid values increased during storage and the control group showed the highest value in the last stage of storage. Finally, the L- and a-values of samples did not change significantly during storage.

• Asian-Australasian Journal of Animal Sciences
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• 제20권6호
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• pp.920-924
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• 2007

Two experiments were carried out on a laboratory scale. The first involved a study of the effect of green tea on characteristics of fermented juice of epiphytic lactic acid bacteria (FJLB). FJLB was treated with 50 g/L of green tea products as follows: new shoot powder (FJLB+N), leaf powder (FJLB+L), commercial powder (FJLB+P), sterilized new shoot powder (FJLB+SN), sterilized leaf powder (FJLB+SL) or sterilized commercial powder (FJLB+SP). FJLB without any additive was also prepared (Untreated FJLB). After incubation, the number of microorganisms in FJLB were studied. Subsequently, these FJLB were applied at 10 ml/kg to chopped rhodesgrass to study their effects on fermentation. Compared with untreated FJLB, the addition of green tea increased (p<0.05) lactic acid bacteria (LAB) and also aerobic bacteria counts in FJLB. At 60 d of ensiling, all the FJLB treated silages were well preserved, pH and butyric acid content were lower (p<0.001) and lactic acid was higher (p<0.001) than that of the control. Lactic acid content was significantly higher (p<0.001) with treated FJLB than with untreated FJLB. FJLB treated with sterilized green tea decreased (p<0.001) the pH and the lactic acid content was higher (p<0.001) than that in the unsterilized green tea silages.

• 한국축산식품학회지
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• 제25권4호
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• pp.500-506
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• 2005

가루녹차 첨가 드링크 요구르트에 오염된 충치 원인균인 Streptococcus mutans의 생육에 미치는 영향을 연구하였다. 가루녹차가 식중독 유발균과 충치 원인균에 대한 생육 저해 도를 검토한 결과 Staphylococcus aureus와 Salmonella entetitidis의 경우 가루녹차 첨가에 의해 생육에 큰 영향을 미치지 않은 것으로 나타났다. 한편 Escherichia coli O157:H7는 가루녹차 첨가 농도가 증가할수록 생육 억제 현상도 약간 높아지며 증식이 약간 억제되어 가루녹차 무첨가구에 비해 가루녹차 $0.5\%,\;1.0\%,\;1.5\%,\;2.0\%$와 $2.5\%$ 첨가구에서 24시간 배양 후 각각 0.40, 0.43, 0.46, 0.52와 0.54의 log cycle로 감소되었고, Streptococcus mutans의 경우에는 각각 0.56, 0.65, 0.70, 0.81과 0.99의 log cycle로 감소 폭이 커지면서 뚜렷한 성장 억제 효과를 보였다. 가루녹차를 $0.5\%,\;1.0\%,\;1.5\%,\;2.0\%$와 $2.5\%$ 첨가한 드링크 요구르트내에서 $3.4\times10^7CFU/mL$ 수준으로 접종된 Streptococcus mutans는 24시간 배양시 $9.8\times10^5\~2.0\times10^6 CFU/mL$로 감소되었으며, 48시간 배양 후에는 $1.4\times10^4\~7.2\times10^4 CFU/mL$로 $2.66\~3.36$의 log cycle이 감소되면서 Streptococcus mutans의 증식이 크게 억제되었다. 이와 같이 가루녹차 첨가에 의한 드링크 요구르트 내에서 Streptococcus mutans에 대한 생육 억제 효과를 확인할 수 있었다.