• 대한의생명과학회지
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• 제28권1호
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• pp.50-57
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• 2022

In this study, we tried to examine the possibility of developing a dental product such as tooth decay prevention and oral hygiene by manufacturing a natural polymer film for oral use. Natural polymer films were prepared from shark byproduct extract (SBE) and gellan gum (GG). As an antibacterial substance, the antibacterial activity of green tea extract against tooth decay-causing bacteria was measured. An film was prepared by adding green tea extract to the composition of SBE and GG. The mechanical, solubility, moisture content and antibacterial function of the prepared film were investigated in detail. Also, the incorporation of GTE into the SBE/GG film improved the physical performance of the film. Increasing the content of GTE improved the antioxidant and antibacterial properties of the film. Formulation of antimicrobial SBE/GG film containing green tea extract was established and these results evidently showed potential for cavity prevention products application.

• 한국식품영양과학회지
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• 제44권10호
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• pp.1470-1475
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• 2015

본 연구는 산업 부산물의 이용성 향상을 위하여 폐자원인 녹차씨 껍질 추출물의 미백 활성을 평가하기 위하여 수행되었다. 녹차씨 껍질로부터 유용성 성분을 얻기 위하여 에탄올 추출을 한 결과 건조중량 대비 1.24%의 추출물의 수율을 얻을 수 있었고, DPPH 라디칼 소거능 및 tyrosinase 억제능을 관찰한 결과 녹차씨 껍질 추출물의 농도가 증가할수록 활성이 유의적으로 증가하는 것으로 나타났다. 또한 이러한 미백 효과가 세포 내에서도 일어나는지에 관하여 알아보기 위하여 melanoma 세포인 B16BL6에 ${\alpha}$-MSH를 처리하여 melanin의 형성을 촉진시키는 melanogenesis 과정을 유도한 후 녹차씨 껍질 추출물을 처리한 결과 농도 의존적으로 melanin의 형성이 감소되는 것을 알 수 있었다. 이상의 결과로 녹차씨 껍질 추출물의 미백 활성을 확인할 수 있었으며, 이를 활용하여 식품 및 화장품의 기능성 소재로 이용한다면 산업 부산물인 녹차씨 껍질을 활용하는 차원에서 그 경제적 가치가 매우 클 것으로 사료된다.

• Animal Bioscience
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• 제34권3_spc호
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• pp.393-404
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• 2021

Objective: This study compared the catechin composition of different tea byproducts and investigated the effects of dietary supplementation with green tea byproducts on the accumulation of abdominal fat, the modulation of lipid metabolism, and the inflammatory response in red feather native chickens. Methods: Bioactive compounds were detected, and in vitro anti-obesity capacity analyzed via 3T3-L1 preadipocytes. In animal experiments, 320 one-day-old red feather native chickens were divided into 4 treatment groups: control, basal diet supplemented with 0.5% Jinxuan byproduct (JBP), basal diet supplemented with 1% JBP, or basal diet supplemented with 5×106 colony-forming unit (CFU)/kg Bacillus amyloliquefaciens+5×106 CFU/kg Saccharomyces cerevisiae (BA+SC). Growth performance, serum characteristics, carcass characteristics, and the mRNA expression of selected genes were measured. Results: This study compared several cultivars of tea, but Jinxuan showed the highest levels of the anti-obesity compound epigallocatechin gallate. 3T3-L1 preadipocytes treated with Jinxuan extract significantly reduced lipid accumulation. There were no significant differences in growth performance, serum characteristics, or carcass characteristics among the groups. However, in the 0.5% JBP group, mRNA expression of fatty acid synthase (FAS) and acetyl-CoA carboxylase (ACC) were significantly decreased. In the 1% JBP group, FAS, ACC and peroxisome proliferator-activated receptor γ levels were significantly decreased. Moreover, inflammation-related mRNA expression levels were decreased by the addition of JBP. Conclusion: JBP contained abundant catechins and related bioactive compounds, which reduced lipid accumulation in 3T3-L1 preadipocytes, however there was no significant reduction in abdominal fat. This may be due to a lack of active anti-obesity compounds or because the major changes in fat metabolism were not in the abdomen. Nonetheless, lipogenesis-related and inflammation-related mRNA expression were reduced in the 1% JBP group. In addition, dietary supplementation with tea byproducts could reduce the massive amount of byproducts created during tea production and modulate lipid metabolism and the inflammatory response in chickens.

• Asian-Australasian Journal of Animal Sciences
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• 제20권6호
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• pp.880-886
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• 2007

Ensiled or oven-dried green tea by-products (GTB) were evaluated in goats for their nutritive potential as protein feedstuffs based on in vitro and in vivo digestibility. To elucidate the effects of tea tannin on in vitro digestibility, polyethylene glycol (PEG) was used as a tannin binding agent. Both ensiled and dried GTB contained 31.9 to 32.6% of crude protein (CP) on a dry matter (DM) basis. Phenolics and tannins in soybean meal and alfalfa hay were low or not detected, but they were high in both ensiled and dried GTB (7.3-10.1% DM as total extractable tannins). In vitro protein digestibility in the rumen ranked: soybean meal>alfalfa hay cube>ensiled GTB = dried GTB. The protein digestibility post-ruminally of these feedstuffs showed a similar trend to that in the rumen, but the digestibility of ensiled GTB was significantly higher than that of dried GTB. Addition of PEG improved the in vitro protein digestibility of both kinds of GTB in the rumen and post-ruminally, indicating that tannins suppressed the potential protein digestibility of GTB. The increased protein digestibility by PEG addition was not significantly different between ensiled and dried GTB in the rumen, but the percentage increment of ensiled GTB was higher than dried GTB post-ruminally. In the in vivo digestibility trial, ensiled and dried GTB were offered to goats as partial substitutes for soybean meal and alfalfa hay cubes. Offering both GTB to goats as 5-10% on a DM basis did not affect nutrient digestibility, ruminal pH, volatile fatty acids, and ammonia concentration. However, the eating time of the GTB-incorporated diet was longer than that of the basal diet. It took 1.4 and 1.6 times longer than the control diet, to eat the diet completely when GTB silage was offered at 5 and 10% levels, respectively, of the total diet. These results show that ensiled and dried GTB are useful as partial substitutes for soybean meal and alfalfa hay cubes for goats with respect to nutritive value. Because of lessened palatability, it is recommended that GTB be incorporated into the diet at 5% on a DM basis.

• 한국식품영양과학회지
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• 제45권7호
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• pp.958-965
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• 2016

본 연구는 산업 부산물의 이용성 증진을 위하여 폐자원인 녹차씨껍질 추출물의 항산화 활성 및 신경세포 보호 효과에 관하여 평가하였다. 녹차씨껍질로부터 유용성 성분을 얻기 위하여 에탄올 추출을 한 결과 약 1.44%의 추출물의 수율을 얻을 수 있었고, 항산화 활성에 관하여 평가하기 위하여 라디칼 소거능 및 xanthine oxidase 저해능, 환원력을 평가한 결과, 녹차씨껍질 추출물의 농도가 증가할수록 항산화 활성이 유의적으로 증가하는 것으로 나타났다. 또한, 이러한 녹차씨껍질 추출물의 뇌신경세포 보호 효과에 관하여 알아보기 위하여 생쥐의 해마 유래 뇌신경세포에 녹차씨껍질 추출물을 처리한 후 $H_2O_2$로 산화적인 스트레스를 유도하여 세포독성에 관하여 알아본 결과, 녹차씨껍질 추출물의 처리는 농도 의존적으로 뇌신경 세포의 생존율을 증가시켰으며, 이에 따라 항산화 효소인 SOD 활성이 증가하고 지질과산화 생성물인 MDA level이 감소한 것을 알 수 있었다. 이상의 결과들로 녹차씨껍질 추출물의 항산화 활성 및 뇌신경세포 보호 효과에 관하여 확인할 수 있었으며, 추후 어떤 메커니즘으로 신경세포를 보호하는지 추가적인 연구가 필요할 것으로 생각한다. 또한, 이러한 결과를 활용하여 녹차씨껍질을 기능성 소재로 활용한다면 폐자원인 녹차씨껍질을 재활용하는 차원에서 그 경제적 가치가 매우 클 것으로 생각한다.