• Food Science and Biotechnology
• /
• 제16권5호
• /
• pp.765-770
• /
• 2007

To examine the possibility of using rough rice as a health-functional food, we investigated its changes in biological activity with germination. Antioxidant activities of the 70% ethanolic extracts of 'Goami2', 'Keunnunbeyo', and 'Heugkwangbeyo' were studied in comparison with those of ungerminated rough rice. The phytic acid level in rough rice decreased on germination, while the level of phenolic compounds increased. Reducing power increased in a dose-dependent manner and the germinated rough rice tended to have enhanced reducing power. Among the rough rice cultivars, the germinated 'Heugkwang' rough rice tended to be the most effective, with scavenging activities for the DPPH, superoxide, and hydroxyl radicals that were 1.6-, 1.3-, and 1.6-fold greater than those of the ungerminated 'Heugkwang' rough rice, respectively. We also found that the germination process increased antioxidant activity in all the rough rice cultivars, where activity was greatest for the 'Heugkwang' rough rice cultivar.

• 방사선산업학회지
• /
• 제4권4호
• /
• pp.319-323
• /
• 2010

Recently, Korean traditional raw rice wines (RRW) have received attention because they are a nutritious food with health properties. But the rapid deterioration of fermented RRW is one of the serious problems for brewing and marketing in the world beyond Korea. The goal of this study was to develop a way to enhance the quality and to lengthen the period of circulation of the RRW. A lactic acid bacterium was isolated from RRW. It was identified as Lactobacillus fermentum (98%) based on its biochemical properties, and 16S rRNA sequence. Treatments of RRW with gamma radiation and green tea extracts reduced the bacterial population except for yeasts and Lactobacillus in the RRW. This result suggested that the natural plant extracts and catechin products can be used as an effective natural storage agent.

• Journal of Microbiology and Biotechnology
• /
• 제33권7호
• /
• pp.926-933
• /
• 2023

Aspergillus oryzae KCCM 11372 was used to enhance the production of β-glucan using humidity control strategies. Under conditions of 60% humidity, solid-state fermentation (SSF) increased the yields of enzymes (amylase and protease), fungal biomass (ergosterol), and β-glucan. The maximum concentrations obtained were 14800.58 U/g at 72 h, 1068.14 U/g at 120 h, 1.42 mg/g at 72 h, and 12.0% (w/w) at 72 h, respectively. Moreover, the β-glucan containing fermented brown rice (β-glucan-FBR) extracts at concentrations of 25-300 ㎍/ml was considered noncytotoxic to 3T3-L1 preadipocytes. We then studied the inhibitory effects of the extracts on fat droplet formation in 3T3-L1 cells. As a result, 300 ㎍/ml of β-glucan-FBR extracts showed a high inhibition of 38.88% in lipid accumulation. Further, these extracts inhibited adipogenesis in the 3T3-L1 adipocytes by decreasing the expression of C/EBPα, PPARγ, aP2, and GLUT4 genes.

• 한국식품과학회지
• /
• 제41권5호
• /
• pp.572-577
• /
• 2009

각 체질군(태양인 5명, 태음인 10명, 소양인 10명, 소음인 10명)을 대상으로 혈액을 채취하여 면역세포를 분리한 후 각 곡류(백미, 현미, 보리, 찹쌀) 추출물을 투여하여 체질에 따른 면역 활성 효능(proliferation, NO production, TNF-${\alpha}$ concentration)을 조사한 결과, 백미, 현미, 찹쌀 추출물은 음인 체질군에서 양인 체질군에 비해 높은 면역활성을 보인 반면, 보리 추출물에서는 음인 체질군에 비해 양인 체질군에서 높은 면역활성을 보였다. 이와 같이 곡류 추출물이 각 체질군에서 면역활성 차이를 보이는 것은 곡류 자체에 기인하는 것도 있겠지만, 곡류가 가지고 있는 고유한 특이 성분 차이에 의한 것으로 사료된다. 따라서 본 연구 결과, 체질에 영향을 미치는 곡류의 각 성분을 조사하여 과학적으로 규명한다면 새로운 체질 적합형 식품 개발이 가능하리라 사료된다.

• 한국작물학회지
• /
• 제50권spc1호
• /
• pp.8-11
• /
• 2005

자광찰벼, 화선찰벼, 및 일품벼 에탄올 분획의 H4IIE 세포에 대찬 산화적 스트레스 보호효과를 검정하기 위해서 수행하였다. 과산화수소에 의하여 생성된 자유라디칼은 H4IIE 세포에 산화적 손상을 초래하며 이러한 손상에 기인된 세포사멸에 대하여 화선찰벼와 일품벼 추출물은 방어효과가 없었으나, 적색을 띤 자광찰벼 추출물의 에탄올 분획은 과산화수소에 의하여 유도된 산화적 스트레스에 가장 현저한 효과를 나타내었다. 금후, 보다 광범위하고 집중적인 연구를 수행한다면 쌀 함유 유효성분들의 생리활성에 관한 보다 명확한 효과가 구명될 수 있을 것으로 사료된다.

• 한국식품영양학회지
• /
• 제33권2호
• /
• pp.149-158
• /
• 2020

The purpose of this study was to investigate antioxidant characteristics and anti-adipogenic effects of colored rice and brown rice extracts in 3T3-L1 adipocyte depending on cultivar (Josaengheugchal, Heugjinmi, Hongjinju, Geongganghongmi, Seolgaeng, Milyang 320, Sindongjin, Baegjinju). Colored rice and brown rice was extracted with 100% ethanol, followed by the analysis of polyphenol, flavonoid, anthocyanin, antioxidant, and anti-adipogenic activity. Total polyphenol and flavonoid content ranged from 6.86~314.08 mg GAE/g and 1.47~56.88 mg CE/g the highest total polyphenol and flavonoid content was observed in Heugjinmi cultivar. Anthocyanin composition was analyzed by HPLC, cyanidin-3-gluoside and peonidin-3-glucoside was found in black rice including Josaengheugchal and Heugjinmi. Also, the ABTS and DPPH radical scavenging activity of colored rice cultivars was higher than that of brown rice cultivars, the highest ABTS radical scavenging activity also was observed in Heugjinmi (128.20 mg TE/g). The anti-adipogenic effects of colored rice and brown rice extracts on differentiation of 3T3-L1 preadipocytes evaluated that extracts of Heugjinmi cultivar significantly reduced intracellular lipid accumulation. These results provide valuable information for the use of Korean colored rice cultivar as a functional food materials relative to anti-obesity.

• 한국잡초학회지
• /
• 제17권1호
• /
• pp.52-58
• /
• 1997

본 실험은 allelopathic물질을 함유한 것으로 알려진 국내 재배벼(Nagdong 외 46종)의 왕겨와 잎의 조 추출액을 이용하여 제초활성 벼품종 선발과 천연식물성 제초제를 개발하기 위한 기초 연구로서 피(E. crus-galli)의 발아에 대한 영향을 조사하기 위하였다. 피 종자에 대한 발아율은 왕겨 추출액의 경우 남원벼가 36%, 계화벼가 38%의 발아율을 보였으며, 잎 추출액은 삼백벼 43%과 서안벼 46%로서 가장 큰 억제 작용을 보였다. 왕겨 추출액과 잎 추출액의 피에 대한 발아 억제 정도 비교 실험에서는 왕겨 추출액이 46%로서 잎 추출액 71% 보다 더 효과적으로 작용하였다. 추출액의 농도처리 효과에서는 농도가 증가됨에 따라서 발아율이 억제되었고 왕겨 추출액의 발아억제정도는 연차간의 차이를 보였다.

• 한국작물학회지
• /
• 제45권5호
• /
• pp.277-281
• /
• 2000

Fifty-four Korean native and 28 foreign varieties harvested in 1998 and 1999 were examined for superoxide dismutase (SOD) and peroxidase (POD) activities. The SOD and POD activities of leaves extracts in Korean native and foreign rice varieties showed variation at the heading stage. The activities of SOD and POD changed with growth stage. In comparison of storage duration, the SOD and POD activities of the extract from three months stored seeds in Korean native (CV=53.3%) and foreign rice (CV=57.9%) varieties were higher than that of stored rices for a year in seed extracts although the activities among varieties did not show significant variation. Also, the averaged activity of foreign rice varieties (SOD=12.9%) was relatively higher than that of korean native rice varieties (SOD=10.7%). The test of activity at the enzymatic level related to antioxidative activity suggests that the rice varieties with higher antioxidative potentials can be developed and also may provide information with rice breeder to breed rice variety with a high antioxidative activity.

• 한국식품영양과학회지
• /
• 제39권4호
• /
• pp.624-630
• /
• 2010

본 연구에서는 여러 품종(삼광벼, 설갱벼, 큰눈벼, 화선찰벼, 홍진주벼, 흑광벼, 일품벼, 하이아미 및 녹미벼)의 도정부산물인 미강(쌀겨)과 식미에 나쁜 영향을 주어 이용되지 않는 싸라기에 대한 70% 에탄올 추출물의 항산화 성분(polyphenol, flavonoid, vitamin E, $\gamma$-oryzanol)과 항산화 활성(ABTS 라디컬 소거능, DPPH 라디컬 소거능, 환원력)을 비교 분석하여 기능적 가치를 평가함으로써 이용 가능성을 살펴보고자 하였다. 품종별 미강과 싸라기의 항산화성분을 측정한 결과 유색미인 홍진주벼에서 vitamin E(일품벼)를 제외하고는 항산화 성분이 가장 높게 측정되었으며, 더불어 흑광벼에서도 상당한 항산화 성분이 함유되어 있음을 알 수 있었다. 또한 싸라기 추출물보다는 미강 추출물에서 높은 함량의 항산화 성분이 분포함을 알 수 있었다. 항산화 활성 측정 결과 항산화 성분이 다량 포함되어 있는 미강추출물에서 높았으며, 그중 홍진주벼 추출물에서 가장 높은 활성을 나타내었다. 본 연구결과 유색미인 홍진주를 비롯하여 흑광벼의 미강은 기능성식품의 성분으로 활용 가능할 것이며 이를 통한 품종별 쌀의 기초 자료를 제공할 수 있을 것이라 생각된다.

• 대한영양사협회학술지
• /
• 제3권2호
• /
• pp.105-111
• /
• 1997

The inhibitory effect of rice(Oryza sartiva L., illpumbyeo) against mutagenicity induced by tryptophan pyrolysates were investigated using Salmonella typhimurium reversion assay. Both methanol extracts of obtained from brown and white rice were found to possess strong activites of inhibiting the mutagenicities of 3-amino-1,4-dimethyl-5H-pyriod[4,3-b]indol(Trp-P-1) and 3-amino-1-methyl-5H-pyrido[4,3-b]indol(Trp-P-2) on Salmonella typhimurium reversion assay. As the concentration of methanol extract increased, inhibitory effect on mutagenicity increased but reached at steady state as inhibition rate of 90% when the concentration was above 10mg/plate. There was no significant difference(p>0.05) in inhibitory effect of methanol extracts between brown and white rice against tryptophan pyrolysates.