• 에너지공학
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• 제23권3호
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• pp.241-246
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• 2014

본 연구는 바이오에탄올을 생산하고자 대표적인 임업부산물인 낙엽을 바이오매스로 하여 전처리 과정을 거친 후 효소가수분해 공정을 적용하여 당화반응 특성을 비교 하였다. 전처리 방법은 화학적으로 산(HCl), 알칼리(NaOH, $NH_3$)처리하였고 각각 침지법, 교반법, 고압멸균법을 적용하여 실험하였다. 처리 효율은 효소가수분해 진행 후 포도당 생산량으로 확인하였다. 실험결과, 알칼리 전처리에서는 산 전처리 대비 18% 높은 글루코즈 생산량을 보여 바이오에탄올 생산을 위한 임업폐기물 화학적 전처리 방법으로는 알칼리처리가 효율이 더 높은 것으로 확인되었다. 또한 화학적 처리방법 중 각 방법을 적용하여 비교한 결과, 모든 방법이 알칼리-수산화나트륨 처리하였을 때 가장 높게 나왔다. 본 연구의 결과를 바탕으로 목질계 바이오매스 중 하나인 낙엽을 기질로 전처리 및 효소가수분해 공정의 가능성을 확인하였고 차후 바이오에탄올 생산에도 영향을 미칠 것으로 예상된다.

• 원예과학기술지
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• 제33권6호
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• pp.812-819
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• 2015

Gladiolus is one of the most popular cut flowers in the world floral market and is highly attractive to consumers. The production of poor-quality gladiolus spikes is one of the most important hurdles to obtaining high prices for this crop. The main objectives of this study were to improve the quantitative characteristics of gladiolus spikes, to increase propagule production and to enhance chemical constituent levels in leaves to help improve plant growth. We performed foliar application of bioregulators, including polyamines (putrescine and spermine) and vitamins (ascorbic acid and thiamine), at different concentrations (0, 0.1, 0.4, 0.7 and 1 mM) to gladiolus plants at the three leaf, five leaf and slipping stages. Application of 1 mM putrescine was the most effective treatment, with prominent effects on economically important spike traits including spike length (55.53 cm), spike diameter (7.53 mm), florets per spike (13.99), first floret diameter (9.66 cm) and first floret weight (4.90 g), followed by spermine treatment. The 1 mM putrescine treatment also had positive effects on corm-associated traits including corm diameter and corm weight, with values of 4.57 cm and 26.16 g compared to 3.47 cm and 17.16 g in control plants, respectively. The contents of chemical constituents in leaves, including total chlorophylls ($8.06mg{\cdot}g^{-1}$), total carotenoids ($1.66mg{\cdot}g^{-1}$), total soluble sugars ($4.75 mg{\cdot}g^{-1}$) and phenolics ($0.89mg{\cdot}g^{-1}$) increased in response to foliar application of 1 mM putrescine compared to the control. Ascorbic acid and thiamine also had positive effects on various plant morphological traits and chemical constituents in leaves compared to control plants, but the growth-promoting effects of polyamines were more pronounced. Hence, applying polyamines to gladiolus leaves will help improve spike production and increasing propagule (cormel) yields.

• 한국작물학회지
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• 제34권1호
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• pp.40-47
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• 1989

오리엔트종 연초에서 생육 후기 조도와, 인공기상실에서의 생육 온도를 달리하여 각각 잎담배의 화학성분과 품질과의 관계를 분석한 결과, 1. 조도가 낮을수록 잎담배의 품질이 낮고, 수확엽의 엽록소함량이 높으나 단위엽면적량이 낮았으며, 2. 당, 석유에텔 추출물 및 휘발성 유기산함량이 낮고, 전질소, 니코틴, 회분, pH는 높았으며 ester 화함물은 조도가 높은 구에서 neophytadiened은 조도가 낮을수록 함량이 높았다. 3. 생육 온도가 2$0^{\circ}C$, $25^{\circ}C$, 3$0^{\circ}C$로 높을수록 개화일수가 짧고 생육이 저하되었으며, 품질은 큰 차이를 보이지 않았다. 4. 생육 온도가 높을수록 질소화합물, 회분함량, pH가 높은 당합량이 낮았으나, 석유에텔 추출물, 휘발성 유기산 및 적유성분 중성부 함량은 큰 차이가 없었다. 5. 생육중 일조와 온도가 다른 환경의 잎담배 품질평가에 공통적으로 적용이 가능한 지수로는 I-IV, IX 및 X이 추천된다.

• 한국식생활문화학회지
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• 제5권2호
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• pp.229-233
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• 1990

Changes in chemical components of green tea leaves at different cooking conditions-blanching and frying-were surveyed as a method of utilizing low graded green tea leaves which missed appropriate plucking times. There was no significant difference in protein content during cooking. But contents of chlorophyll, tannin, vitamin C and caffeine were decreased during cooking, contents of chlorophyll and caffeine showed a greater decrease in frying than blanching. Content of total amino acid of green tea leaf was 15.8% and blanching showed bigger diminution of its content in comparision with frying during cooking.

• 한국연초학회지
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• 제4권2호
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• pp.75-80
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• 1982

During the process of curing of the tobacco (Nicotiana tabacum L. ) leaves the concentration change of Nonvolatile organic acids and Higher fatty acids of the flue-cured tobacco leaves was observed. The contents of Nonvolatile organic acids in flue-cured tobacco leaves were as follows, malic> oxalic>malonic>citric>succinic acid. Higher fatty acids was linolenic>Palmitic>oleic >stearic$\geqq$linoleic acid, Citric acid content of last curing time was increased about 4~5 times in compare to before curing tobacco. It was concluded that significant changes of three variety flue-cured tobacco but a significant difference was observed in the composition of Daegu gold variety.

• 한국연초학회지
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• 제8권2호
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• pp.3-8
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• 1986

This study was carried out to investigate the effect of different soil moisture contents on the growth and chemical constituents of burley tobacco and on the protein pattern in tobacco leaf. Height, stem diameter, and largest leaf length of tobacco droughted from 45 to 60 days after transplanting was not recovered by rewatered amount of water supply from 60 to 75 days after transplanting, but leaf width enlarged. Dry weight per unit leaf area and total nitrogen content showed high values in low soil moisture, but total alkaloid contents were not different according to soil moisture contents. Soil moisture content didn't effect on the protein pattern of middle and upper leaves, but lower leaves showed the mild color and fewer numbers of the protein bands than those of midd1e and upper leaves.

• 대한화학회지
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• 제67권2호
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• pp.150-155
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• 2023

Eurya emarginata is an evergreen tree growing in the southern regions of Korea including Jeju Island. In this study, antioxidant and anti-photoaging effects were investigated with the extracts of E. emarginata leaves. As comparative studies with the extract and five solvent fractions, the EtOAc fraction showed the most effective DPPH and ABTS⁺ radical scavenging activities. The EtOAc fraction also inhibited matrix metalloproteinase-1 (MMP-1) production most effectively. Phytochemical study on the EtOAC fraction resulted in the isolation of three compounds; eutigoside C (1), eutigoside B (2) and quercitrin (3). Among the isolates (1-3), quercitrin (3) showed excellent antioxidant activities and inhibitory properties on MMP-1 production. Based on these results, it was suggested that extracts of E. emarginata leaves could be developed as natural anti-photoaging agents in cosmetic formulations.

• Natural Product Sciences
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• 제1권1호
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• pp.1-4
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• 1995

MeOH extract of the leaves of Xanthium strumarium L. were found to have cytotoxic activities against five human tumor cell lines. Cytotoxicity-guided chromatographic fractionation led to the isolation of the ${\alpha}-methylene$ containing sesquiterpenes, xanthatin, 8-epi-xanthatin and 8-epi-tomentosin. 8-epi-Xanthatin was found to be far more cytotoxic than 8-epi-tomentosin, which lacks the conjugated enone moiety present in 8-epi-xanthatin.

• 생약학회지
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• 제25권2호
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• pp.105-112
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• 1994

A chemical examination of the aqueous acetone extract of the leaves of Securinega suffruticosa has led to the isolation of nine phenolic compounds. On the basis of chemical and spectroscopic evidences, the structures of these compounds were established to be gallic acid(1), corilagin(2), helioscopinin B(3), geraniin(4), bergenin (5), norbergenin(6), 11-O-galloyl norbergenin(7), gallocatechin(8) and rutin(9).

• 약학회지
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• 제37권3호
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• pp.306-310
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• 1993

The leaves of Cedrela sinensis have been used for food at south area in Korea and oriental medicine for treating enteritis, dysentery and itch. Kaempferol, methyl gailate, quercetin, afzelin, quercitrin, isoquercitrin and rutin were isolated from the leaves of this plant and characterized by spectral data. These compounds are reported for the first time from this plant.