• Food Science and Preservation
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• v.9 no.1
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• pp.92-96
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• 2002

The nitrite-scavenging and antimutagenic effects of various solvent extracts from different parts of the loquat. were investigated to develope as source of functional food. The nitrite-scavenging and antimutagenic effects of fractions obtained from methanol extract were most highest in ethyl acetate fraction. Ethyl acetate fraction showed better results in the nitrite scavenging activity of 80% in leaf, 81% in seedless fruit, 73% in peel and 63% in seed. The antimutagenic effect showed strong ethyl acetate fraction of 53.1%, 48.3% in leaf and seedless fruit. The antimutagenic effect increased with increasing concentration of ethyl acetate fraction against mutagenicity induced by direct mutagen of IQ in Salmonella typhimurium TA 100. Addition of 2.5 mg and 5 mg of ethyl acetate fraction showed inhibitory effect of 65.5%, 71.2% in leaf and 63.4%, 69.2% in seedless fruit, respectively.

• The Korean Journal of Community Living Science
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• v.28 no.4
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• pp.537-546
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• 2017

This study was performed to determine the hepatoprotective effects of ethanol extract of loquat leaf (LL) on alcohol-induced liver damage in rats. Sprague-Dawley rats (n=32) were divided into the following four groups: normal group (NOR), ethanol administrated group (ET), ethanol plus LL 200 mg/kg BW/day administrated group (ET-LLL), and ethanol plus LL 400 mg/kg Bw/day administrated group (ET-LLH). Body weight gain and food intake of the ET group were significantly reduced compared to those of the ET-LLL and ET-LLH groups. Serum aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), and lactate dehydrogenase (LDH) activities elevated by ethanol administration were significantly reduced by LL administration. Serum triglyceride (TG) and total cholesterol (TC) contents and hepatic TG and TC contents of the ET group were significantly elevated compared to those of the NOR group. However, TG and TC contents in the serum and liver were significantly reduced in the ET-LLH group. Hepatic glutathione (GSH) contents of the ET-LLL and ET-LLH groups were significantly elevated, and hepatic thiobarbituric acid reactive substances (TBARS) contents were reduced compared to that of the ET group. Taken together, these results suggest that LL may have a possible protective effect on the improvement of hepatic injury by ethanol administration.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.10a
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• pp.61-61
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• 2019

본 연구에서는 실내 광조건에서 자생 장미과 상록 활엽 목본 2종의 생육반응을 조사하였다. 식물재료는 다정큼나무[Rhaphiolepis indica var. umbellata (Thunb.) Ohashi]와 비파나무[Eriobotrya japonica (Thunb.) Lindl.]의 3년생 실생묘를 사용하였다. 실내 광량은 10, 50, 100 및 200 PPFD (${\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$)로 설정되었으며, 광주기(12/12 h), 온도($25{\pm}1^{\circ}C$), 습도($55{\pm}3%$) 및 관수(1회/3일) 주기는 일정하게 유지하였다. 실내에서 8주간 재배한 다음 유리온실에서 동일 기간동안 재배된 대조구와 생육 및 광합성 능력 등을 비교하였다. 연구 결과, 다정큼나무의 생육은 200 PPFD에서 대조구와 유사한 수준이었으며, 줄기직경은 광량과 정비례하는 경향이었다. 엽수는 대조구에 비해 고 광량(100, 200 PPFD) 조건에서 유의적으로 높은 결과를 보였다. 처리 별 최대 양자수율(Fv/Fm) 및 광계II 성능지수(Pi_Abs)는 대조구와 유사한 수준이었으며, 광량에 따른 유의적인 차이가 없었다. 비파나무는 재배기간 동안 광량에 관계없이 생육변화가 크지 않았으나, 엽록소함량은 200 PPFD에서 가장 많았다. 한편 10 PPFD에서는 모든 개체의 잎 고사에 따른 관상가치가 하락하였다. Fv/Fm은 200 PPFD에서 대조구와 유사한 수준이었으며, Pi_Abs는 저광량(10, 50 PPFD) 조건에서 유의적으로 높은 수치였다.

• Food Science of Animal Resources
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• v.42 no.4
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• pp.566-579
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• 2022

Deterioration of jerky during storage is a major concern; this is usually combated with natural or synthetic antioxidants. This study aimed to evaluate the quality characteristics of semi-dried restructured jerky with and without loquat leaf extract (LE) powder and ascorbic acid (AA) during storage for 180 days. The jerkies were formulated with 0%, 0.15%, and 0.3% LE and/or 0.05% AA (Control, no antioxidant; AA, 0.05% AA; LE 0.15, 0.15% loquat LE; LE 0.15-AA, 0.15% loquat LE+0.05% AA; LE 0.3, 0.3% loquat LE; LE0.3-AA, 0.3% loquat LE+0.05% AA). LE is a phenolic compound, whose 1,1-diphenyl-2-picrylhydarzyl radical scavenging activity and metal chelating activity were found to be higher than AA. All antioxidant combinations having higher LE concentration and containing AA were effective in delaying protein and lipid oxidation compared to the control or AA. At the end of storage period, LE 0.15-AA and AA had higher CIE a^* and lower shear force than the control. Therefore, the combination of 0.15% LE and 0.05% AA can result in reduced protein and lipid oxidation without any negative effect on the quality characteristics of semi-dried restructured jerky.

• Food Science and Preservation
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• v.5 no.3
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• pp.270-274
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• 1998

In order to enhance the availability of Korean loquat fruit, loquat juice was manufactured and its physicochemical characteristics are measured. The juice of raw fruit and pressed juice after blanching with steam that the pH, sugars, total acids and yields were 3.4, 3.6, and 8.5, 8.0 $^{\circ}$ Brix, and 0.36, 0.34%, and 53.2, 57.4% respectively. Four groups of juices were processed as followed. A ; juice of clarified after filteration, B ; pressed and filtered juice of raw fruit in refrigerated for 50 days, C ; clarified juice of heated at 90$^{\circ}C$ for 2 min., D ; clarified juice of blanched and pressed with raw fruit. Total acids, pH and sugars of A, B, C and D juices were 0.27, 0.35, 0.29 and 0.28%, and 3.80, 3.10, 3.68 and 3.71, and 7.5, 8.5, 8.0 and 8.2 $^{\circ}$Brix, respectively. Juice of B was higher total free sugar and organic acid than others. The chromaticity of D juice was stable than others. In the sensory test of loquat juice, that the product showed excellent result at 11 $^{\circ}$Brix and pH 3.78 when 4% of fructose and 0.05% of citric acid added.

• Korean Journal of Medicinal Crop Science
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• v.4 no.4
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• pp.314-320
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• 1996

Antitumouric effect of loquat was investigated treating the extract from leaves, stems, fruits or seeds to normal and cancer cell lines to check by MTT method wheather the cancer cells are spec­ifially attacked. The results are summarized as follows. Water of MeOH extract from each organ were applied to human normal and cancer cell lines, SNU-1 and SNU-C4. The water extract from fruit flesh gave no dffect to normal cell lines by killed all the cancer cell lines. The water extract from fruit flesh was purified by Sephadex LH-20 and separated into 9 fractions which were than applied to 8 cancer cell lines. The eighth fraction out of the 9 fractions gave no effect to normal cells but exerted specific cytotoxicity to breast cancer, stomach and liver cancer cells. The eighth fraction was orally administed and injected to 10 mice each suffering from the abdominal cancer induced by myeloma cells, SP2/0-Ag14. In the groups received the treatment, only one mouse each died in 2 months but the rest survived until the end of the experimental period, which those in the control plot died in 10 to 13 days. The present results confirmed that loquat contained some substance that had specific cytotoxicity to human cancer cells.