• Current Research on Agriculture and Life Sciences
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• 제33권2호
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• pp.49-56
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• 2015

본 연구는 이팝나무 잎과 열매, 꽃 추출물에서 항산화 활성을 통한 기능성 식품에 대해 탐색하고자 하였다. 이팝나무 꽃 추출물에서 phenolics 함량은 물과 90% ethanol 추출물에서 각각 20.8, 32.2 mg/g을 나타내었다. 이팝나무 잎, 열매, 꽃을 $100{\mu}g/mL$로 농도를 조절하여 DPPH free radical 소거 활성을 측정한 결과, 물과 ethanol 추출물 모두 70% 이상의 높은 소거 활성을 나타내었다. ABTS radical decolorization는 $100{\mu}g/mL$ phenolic 농도에서도 모두 약 80% 이상의 항산화 활성을 나타내었다. Antioxidant protection factor는 $50{\mu}g/mL$ phenolic 농도에서 이팝나무 잎의 물과 ethanol 추출물은 각각 2.27, 1.70 PF로 가장 높게 측정되었다. TBARs를 측정한 결과, 이팝나무 잎, 열매, 꽃 추출물의 $200{\mu}g/mL$ phenolic 농도에서 물과 ethanol 추출물 모두 70% 이상의 항산화 활성을 나타내었다. 이팝나무 잎 추출물의 항산화활성은 TBARs를 제외한 모든 실험에서 대조구로 사용한 BHT보다 높은 항산화 활성을 나타내었다. 따라서 이팝나무 잎, 열매, 꽃 추출물은 수용성, 지용성 물질에 대한 높은 항산화능을 나타내었고, 이 결과로 이팝나무 잎과 열매, 꽃 추출물은 항산화 효과와 기능성 식품 소재로서 활용 가능성을 기대할 수 있었다.

• 한국식품조리과학회지
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• 제20권6호
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• pp.589-597
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• 2004

This study was conducted to investigate the effects of various kinds of electrolyzed and chlorinated waters on the sensory and microbiological qualities of fresh-cut lettuce and to determine the most suitable electrolyzed water for the vegetable dishes, without heat treatment, at institutional foodservices. The sensory evaluation resulted in higher scores on the 1st-day of storage for the EW-1 (diaphragm type 1) and EW-3 (non-diaphragm type) compared to that for EW-2 (diaphragm type 2), with regard to their appearance, discoloration, texture, taste and overall acceptability characteristics. However, over time, EW-3 ranked highest, with a score of 8.00 (very like), on the 4th-day of storage, which maintained the highest level up to the 7th-day of storage, at which time the score was 7.00 (fairly like). The CW (chlorinated Water) had a significantly lower score, due to the smell of chlorine, although there was no concern with relation to chlorine residue from the electrolyzed waters. Microbial examinations of the total plate count revealed that immersing lettuce into EW-3 brought about l/3,000 to 1/30,000 reductions in the microbial counts of the TW treatment or untreated samples for up to seven days of storage. The CW treatment gave a 1/10 reduction in the microbial counts compared with the TW (tap water) treatment. The coliform bacterial counts also showed similar trends to those of the total plate count values. With regards to the psychotropic bacterial count, EW-3 was able to result in as much as a 1/30,000 reduction in the initial counts. As vegetable dishes, such as salad, can not be heat-sterilized, the utilization of EW-3 for the preparation of vegetable dishes without heat treatment will be an excellent choice to improve the critical control point in production state as a new effective means for sanitizing management.

• Preventive Nutrition and Food Science
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• 제10권3호
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• pp.251-256
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• 2005

An extract obtained from germinated brown rice was evaluated for protective effects against the adverse effects of a chronic high fat diet. C57BL6/J mice were divided into three groups; normal diet + water group (ND), high fat diet + water group (HD), high fat diet + brown rice water extract group (HD + BE) and fed for 8 weeks (6 day/week). The ND group diet was 11 kcal fat $\%$. The HD group and HD + BE group diet were 42 kcal fat $\%$. Weight gains were not significantly different between groups. However, abdominal fat $\%$ was 1.6-fold higher in the HD group than HD + BE group. Feed consumption was significantly higher in the ND group than HD group. Serum triglyceride, total cholesterol and LDL-cholesterol increased with a high fat diet, but decreased by brown rice water extract administration to the high fat diet group. Serum HDL-cholesterol decreased by the high fat diet, but increased by the brown rice wate extract administration. Also, serum HDL-cholesterol/total cholesterol ratio was 2.3-fold higher in the HD + BE than the HD. Liver triglyceride and total cholesterol were not significantly different among groups. These data suggest that brown rice water extract administration improves the serum lipid profiles of C57BL/6J mice.

• 한국식품위생안전성학회지
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• 제32권1호
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• pp.50-56
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• 2017

본 연구는 약수와 약수터 음용도구의 일반세균수, 대장균군수 및 식중독세균 오염도를 평가하여 약수와 음용도구의 미생물학적 안전성을 평가하고자 하였다. 약수터 10곳의 약수와 약수터에 비치되어 있는 음용도구 34건을 실험대상으로 하였다. 약수의 경우 일반세균수는 평균 1.8 log CFU/mL 검출되었고 음용도구의 경우 평균 $4.7log\;CFU/100cm^2$ 검출되었다. 위생지표미생물인 대장균군의 경우 약수는 평균 1.2 log CFU/mL 검출되었고 음용도구는 평균 $1.7log\;CFU/100cm^2$ 검출되었다. B. cereus, S. aureus, Salmonella spp., E. coli O157:H7, L. monocytogenes, V. parahaemolyticus, Y. enterocolitica를 실험한 결과 약수와 음용도구에서 Y. enterocolitica 등 6종의 식중독 미생물은 검출되지 않았으나, B. cereus는 음용 도구 34건 중 5건 (14.7%) 검출되었다. 약수터 음용도구에서 분리된 B. cereus의 주요 설사독소 유전자는 nheA와 entFM로 나타났다. B. cereus 5균주는 모두 NHE 설사 독소를 생산하였으나 HBL은 2균주에서만 검출되었다. 항생제 감수성 실험결과 oxacillin 등 ${\beta}-lactam$계 항생제에 내성을 나타내었다. 약수터 음용도구의 미생물 오염도와 분리된 B. cereus의 독소 유전자 및 독소 단백질 생산능을 분석한 결과 약수터에 비치된 음용도구에 의한 식중독 위험성이 상존하는 것으로 나타났다. 따라서 다중이 사용하는 약수터 음용도구의 철저한 위생관리가 필요하며 위생관리가 곤란할 경우 개인 컵을 이용하거나 미생물 안전성을 확보할 수 있는 음용도구 개발이 필요한 것으로 판단되었다.

• 상하수도학회지
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• 제22권2호
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• pp.251-257
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• 2008

Food compost, having a higher organic contents than soil, could be an alternative material to prevent the proliferation of heavy metals contamination in soil. In this study we used a convection-dispersion local equilibrium sorption model(CDE) and a two-site non-equilibrium sorption model to find the effects on the adsorption and transportation of Pb by mixing food compost with soil and we also tried to find the effect of velocity and concentration of the injected solution on the characteristics of Pb. We measured Pb concentrations in injection-liquid and in effluent, and then applied them to CXTFIT program. As a result of column experiments, some parameters(D, R, ${\beta}$, ${\omega}$) used in two-site non-equilibrium adsorption model were obtained. Characteristics of Pb adsorption and transport were analyzed using the parameters(D, R, ${\beta}$, ${\omega}$) obtained from the CXTFIT program, We could know that mixed soil with food compost showed a higher adsorption capacity from the retardation factor(R) calculated from the breakthrough curve(BTCs) of Pb. Rs of soil and mixed soil are 20.45, 37.45 respectively, indicating that the adsorption and the transportation characteristics could be accessed quantitatively by using of two-site non-equilibrium adsorption model.

• 한국수산과학회지
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• 제57권2호
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• pp.137-144
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• 2024

In this study, we investigated the antioxidant and physiological activities of the Korean marine algae, Enteromorpha compressa. Solvent extracts of E. compressa were prepared using 70% ethanol, 80% methanol, and water, with extraction yields ranging from 9.55% to 25.67%. The total polyphenol and flavonoid contents ranged from 20.76-28.41 mg/g and 2.56-18.59 mg/g, respectively. Compared with the water extract, the ethanol and methanol extracts were found to have higher antioxidant activities. All three extracts were found to promote alcohol dehydrogenase and aldehyde dehydrogenase activities in a concentration-dependent manner, whereas the methanol and ethanol extracts were established to have the highest angiotensin-converting enzyme (ACE) inhibitory activity (IC₅₀=1.40 ㎍/mL) and β-secretase inhibitory activity (IC₅₀=0.17 ㎍/mL), respectively. These findings thus indicate that E. compressa could have beneficial application as a supplementary antioxidant and functional constituent in food and pharmaceutical materials.

• 한국식품과학회지
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• 제46권4호
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• pp.465-469
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• 2014

버려지는 자몽 껍질에 다량 함유되어있는 플라바논을 추출하여 기능성 성분을 재이용하였다. 친환경용매인 아임계수 추출기술을 이용하여 $170^{\circ}C$, 10 min의 최적 조건에서 추출함으로써 무독성 용매로 빠르고 경제적으로 추출할 수 있었다. 자몽껍질 추출물을 ${\beta}$-cyclodextrin을 이용하여 처리함으로써 플라바논과 같은 비극성 물질을 캡슐화하여 소재의 가용화를 용이하게 하였다. 이것은 항산화 기능이 향상된 대체 소재의 개발 및 건강지향식품에 이용할 수 있으며, 이를 통하여 세계 기능성 식품 시장으로의 진출을 위한 발판으로도 삼을 수 있을 것으로 기대된다.

• 한국식품영양과학회지
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• 제33권8호
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• pp.1268-1272
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• 2004

본 연구에서는 천년초 손바닥 선인장 유기용매 추출물의 항균성을 비교, 검토하고자 하였다. 70% ethanol로 추출하여 hexan, chloroform, ethyl acetate, buthanol, water로 순차 분획하여 ascorbic acid, benzoic acid와 항균효과를 비교하여 보았다. Escherichia coli 등 Gram positive bacteria 2종, Gram negative bacteria 2종, yeast 1종 등 총 6개의 병원성 식중독 미생물에 대해 항균효과를 검토한 결과 ethyl acetate 분획물이 가장 우수한 항균효과를 나타내었고 이는 동량의 benzoic acid보다 월등히 우수하였다. Gram positive bacteria와 Gram negative bacteria에 대해 유의적 차이가 없는 비슷한 항균효과를 보여주었으나 bacteria에 비해 yeast에서 항균효과는 낮게 나타났다.

• 상하수도학회지
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• 제26권4호
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• pp.513-520
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• 2012

The use of food waste disposers (FWDs) can be an emerging option to manage organic food wastes in municipal sewage system. The cost-benefit analysis (CBA) of introducing domestic FDWs is conducted to access the allowable disposer market price and the economic impact on food waste management from conventional solid waste management system. If the convenience value of 10,000 won/month is taken into consideration based on survey results, the introduction of FDWs can lead to net economic benefits, allowing the capital cost of disposer up to 1,000,000 won/unit. Without the consideration of convenience value, the introduction of FWDs becomes profitable if the capital cost of disposer is less than 50,000 won/unit. In case that the value of convenience is more than 7,000 won/month, the reduction of food waste management cost is not valid for the introduction of FWDs to be non-profitable. However, if environmental externalities are considered, the proposed system could become breakeven with the cost of food waste management decreases by 54 % (60,000 won per ton).

• Fisheries and Aquatic Sciences
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• 제17권4호
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• pp.409-419
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• 2014

The proximate composition and various specific components of Antarctic krill Euphausia superba, in the catch season between March and August were investigated. Frozen krill were freeze-dried and milled. The proximate composition comprised water, proteins, fats, ash, fatty acids, and amino acids, while the specific components were vitamins, minerals, nucleotides, betaine, and astaxanthin. The moisture content of the krill ranged from 77 to 80%, with the highest value in June, and the ash content was between 12 and 13%. The protein content was lowest in May, and the fat content was 18-19%, with the highest value in March. The amino acid content varied according to the season: taurine and glycine were highest in August; ${\beta}$-alanine was higher in April and May; and arginine, ornithine, and lysine were highest in March. The unsaturated fat content was ~50% and omega-3 fatty acids were highest in June. Oil-soluble vitamins A and E were highest in March, and the water-soluble vitamin content was less than that of oil-soluble vitamins. The mineral content was highest in June, and the most abundant mineral was sodium at 235.60 mg/100 g krill. The content of other minerals was lowest (2.94 mg/100 g) in April, except for lead. The nucleotide content was highest in July, while the betaine content was highest in April and lowest in June. The astaxanthin content was highest in May and ranged from 6 to 10 ppm in other months.