• Journal of the Korean Society of Food Science and Nutrition
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• v.42 no.9
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• pp.1345-1350
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• 2013

The objective of this study was to evaluate the effect of extraction methods on the antioxidant activity of Citrus unshiu pomace. For this purpose, two kinds of citrus pomace (CP)s, whole fruit CP and pulp CP, were used for preparing the extracts with hot water or 70% ethanol. It is well-known fact that whole fruit CP has more calories and carbohydrates, although moisture content is higher in pulp CP. Further, whole fruit CP extracts have higher levels of total phenolic contents compared to CP extracts. In addition, DPPH and alkyl radical scavenging activities were also higher in whole fruit CP, especially in ethanolic extracts. Our results based on liquid chromatography-mass spectrometer showed that 70% ethanolic extract of whole fruit CP has the maximum levels of nobiletin and tangeretin contents. The levels of naringin, which is known as an antioxidant flavonoid, was determined only in the 70% ethanolic extract of whole fruit CP. This result, however, is consistent with the observed DPPH and alkyl radical scavenging activities. We had also performed a gas chromatography analysis that showed all the four extracts contained the compound hydroxymethyl furfural. Significantly, this compound has been reported to have antioxidant activity. Taken together, findings of this study indicate that ethanolic extraction of whole fruit CP is a good source of antioxidant compounds and hence the same could be utilized as an important method to obtain such beneficial compounds on an industrial scale.

• Applied Chemistry for Engineering
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• v.35 no.1
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• pp.42-47
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• 2024

Limonene was separated from waste citrus peels by a vacuum drying process with a venturi, and bioethanol was produced from dried citrus peels. Vacuum drying using venturi was very effective in removing moisture and limonene compared to hot air drying and natural drying. Citrus peels prepared by venturi vacuum drying were the most suitable for ethanol fermentation. The moisture and limonene content of the citrus peels dried for 15 hours were 17.0% and 3.2%, respectively. By venturi vacuum drying, essential oil containing limonene and floral water were obtained, respectively. The amount of essential oil separated by venturi vacuum drying was 4.21 mL essential oil/kg citrus peel, 79.9% of the separated essential oil was limonene.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.11a
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• pp.521-524
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• 2006

본 연구에서는 농업폐기물인 감귤박의 효율적인 재활용 방안으로 고부가가치 제품인 활성탄을 제조하여 이용하는 가능성에 대하여 조사한 결과, 감귤박 폐액으로부터 건조한 시료의 조성은 대부분이 탄수화물로 구성되어 있으며, 또한 이는 미생물, 농약 및 중금속에 오염되지 않은 순수한 천연 재료로 구성되어 있음을 알 수 있었다. 또한 탄화공정 및 활성화공정을 통해 제조된 활성탄의 요오드 흡착능이 KS 규격 중 1급(활성탄 1,100 mg/g 이상)보다 높은 값으로 나타나 공업용 활성탄으로의 활용이 가능할 것으로 사료된다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.11a
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• pp.525-528
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• 2006

감귤박을 원료로 하여 활성화제인 KOH를 사용한 약품활성화공정을 수행하여 감귤박-활성탄을 제조하고, 흡착능 및 세공분포 등을 분석한 결과 요오드 흡착능이 KS 규격 중 1급(활성탄 1,100 mg/g 이상)보다 높은 값으로 나타나 양질의 활성탄을 제조할 수 있음을 보였다. 또한 약품활성화법을 사용함으로써 탄화공정에서 제조된 탄화시료보다 월등히 높은 비표면적과 미세세공의 발달이 이루어져 KOH를 이용한 약품활성화법이 활성탄의 제조공정으로서 활용할 수 있음을 확인할 수 있었다.

• Journal of Animal Science and Technology
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• v.55 no.3
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• pp.219-227
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• 2013

This study was conducted to elucidate the characteristics of equine meat traits and to evaluate the utilization of dried-citrus pulp abundantly produced in Jeju Island as feed ingredient in the diet of finished meat horses. Treatment groups consisted of wheat bran (A) and the dried-pellet mixture of citrus pulp (20%) and wheat bran (80%) (B). Feeding of agricultural by-products were 2 times in a day at the level of 1.5% of body weights. Water and dried-grass forage was not restricted. The average daily gain was similar in both groups. Feed conversion of treatment B showed lower level than that of A. Carcass rate of B was relatively lower than that of A, but meat yield grade of B was higher than that of A. For meat color traits, $L^*$ of B was lighter than that of A, and $b^*$ of group B was lower than that of group A. From the analysis of physical characteristics of equine meats, shearing force had decreased in the treatment B but the levels of drip loss and water holding cavity had increased in the treatment B compared to A. The level of crude fat is lower in the treatment B than the treatment A. For the mineral contents, the treatment B showed higher levels of Ca, K, Mg, Cu and Mn than that of A. For the fatty acid contents, the treatment B showed increased levels of stearic acid, oleic acid, eicosenoic acid, and arachidonic acid compared to A. Consequently, these results suggested that dried-citrus pulp might be utilized as replacement material for equine forage. Please rewrite the whole abstract and should include all required information. Before resubmission, please check it again from a native colleague in your group.

• Proceedings of the KAIS Fall Conference
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• 2010.11b
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• pp.568-571
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• 2010

본 연구의 목적은 감귤 기능성물질의 산업화 타당성 분석을 하는 것이다. 구체적인 경제성 분석방법은 순현가와 투자수익률(내부수익률)을 이용한 기본적인 경제성분석과 손익분기점분석, 그리고 주요변수들의 변화에 따른 순현가의 변화를 파악하기위한 민감도분석이고, 정책적 분석은 감귤기능성 물질산업화가 감귤산업 전체에 미치는 파급효과를 계량적, 정성적으로 분석하였다. 감귤 기능성물질의 산업화 타당성 분석결과에 따르면, 미숙과 감귤 2만톤과, 감귤박 2만톤을 처리한다고 가정했을 경우 감귤산업에 미치는 경제적 효과는 연간 5백억원으로 나타났다. 이러한 막대한 경제적 효과는 본 사업에 투자되는 전체비용 약 1백억원, 10년 사업기간을 가정하면 연간 10억원의 설비투자비로 그의 50배의 경제적 파급효과를 나타날 수 있기 때문에 감귤기능성물질의 산업화효과는 매우 큰 것으로 나타났다.

• Journal of Life Science
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• v.24 no.8
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• pp.827-836
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• 2014

There is a rising trend in obesity due to various factors, including changes in eating habits, lack of exercise, and genetic and psychological factors. Citrus peel has been reported to prevent obesity via antioxidative, antihypertensive, and LDL cholesterol-lowering effects. This study investigated the effects of citrus peel extract fermented with or without Aspergillus oryzae in a mouse model of diet-induced obesity. The animals were divided into four groups: a high-fat diet group (HFD), a normal fat diet (NFD) group, a citrus peel extract (CP) group, and a citrus peel extract fermented with A. oryzae (CPA) group. The citrus peel extract improved lipid metabolism and weight loss in the high-fat diet-induced obese mouse model. As expected, the body weight was higher in the HFD group compared with the NFD, CP, and CPA groups. However, the concentrations of total cholesterol (TG) and triglyceride (TC) in the serum and liver of the CP and CPA groups were lower than in the HFD group. There were no significant differences in the HDL cholesterol concentration among the groups. Taken together, our results suggest that extract of citrus peel biotransformed with A. oryzae had more antiobesity activity than citrus peel not transformed by A. oryzae through the fermentation of metabolites.

• Proceedings of the Korean Society of Crop Science Conference
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• 2020.06a
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• pp.192-192
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• 2020

• Proceedings of the Korean Society of Crop Science Conference
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• 2020.06a
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• pp.190-190
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• 2020

• Proceedings of the Korean Society of Crop Science Conference
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• 2020.06a
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• pp.191-191
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• 2020