• 한국연초학회지
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• 제22권2호
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• pp.114-122
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• 2000

This study was carried out to investigate the changes in the composition of essential oils for the improvement of air-curing process of burley tobacco leaves. From the essential oils isolated from the cured tobacco leaves by steam distillation method, 90 compounds including 15 acids and esters, 19 alcohols, 23 aldehydes and ketones, 19 hydrocarbons, and 14 miscellaneous compounds, could be identified by gas chromatography and gas chromatography-mass spectrometry. Among them, acids and esters were gradually decreased during the progress of curing after harvesting. A rapid increase in alcohol content was observed in the earlier stage of curing, but thereafter, decrease followed until the end of curing However, aldehyde and ketone groups were continuously increased during curing and were 3 times higher in quantity after curing than at the harvesting time. The concentration of hydrocarbons was increased in the earlier stage of curing, but gradually decreased from the middle stage. The miscellaneous compounds were continuously increased in content until the end stage of curing, with rapid increased in the earlier stage of curing.

• 통합자연과학논문집
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• 제1권3호
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• pp.192-194
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• 2008

A series of non-free hydride reducing systems containing boron or aluminum atom, which possess no metal-hydride bond but an available hydrogen at a branched ${\beta}$-position, has been applied to the selective reduction (chemo--, regio-, and stereoselective reduction) of organic compounds. The systems, comprised of diisopinocampheylborane and diisobutylalane derivatives, exhibited almost perfect selectivities in the reduction of aldehydes and ketones. The characteristics features of this systems leading to a perfect transformation have been depicted in this report, especially in the 1) Reduction of ${\alpha}$,${\beta}$-Unsaturated Carbonyl Compounds to Allylic Alcohols via 1,2-Reduction, 2) Chemoselective Reduction between Structurally Different Carbonyl Compounds, and 3) Stereoselective Reduction of Cyclic Ketones.

• Natural Product Sciences
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• 제26권2호
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• pp.132-135
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• 2020

Volatile constituents obtained by water distillation from the aerial parts and root of Onosma dichroanthum Boiss (Boraginaceae) native to the north of Iran were investigated by GC and GC/MS for the first time. Palmitic acid (39.61%) and decane (31.39%) were the major components in the root while decane (26.26%) and phytol (25.52%) were the predominant constituents in the aerial parts. Ketones, aldehydes, alkanes, fatty acids, oxygenated diterpenes and sesquiterpenes were characterized as the most phytochemicals in the aerial parts. Alkanes and fatty acids were identified as the main groups in the root volatile substances. There were two ketone derivatives, belong to apocarotenoids, in the aerial parts; β-ionone and hexahydrofarnesyl acetone.

• Preventive Nutrition and Food Science
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• 제15권2호
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• pp.147-151
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• 2010

The volatile aroma constituents of Atractylodes japonica rhizome were separated by steam distillation extraction method using a Clevenger-type apparatus, and analyzed by gas chromatography-mass spectrometry (GC/MS). The yield of the essential oil from Atractylodes japonica was 1.0% (v/w), and its color was pale yellow. Forty-five volatile flavor compounds, which make up 93.86% of the total peak area, were tentatively identified in the rhizome oil. The oil contained 32 hydrocarbons (79.19%) with sesquiterpene hydrocarbon predominating, 3 esters (12.46%), 4 alcohols (0.11%), 1 ketone (0.01%), 2 aldehydes (0.02%), and 3 miscellaneous compounds (2.07%).

• Applied Biological Chemistry
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• 제34권4호
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• pp.344-352
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• 1991

진달래꽃으로부터 얻어진 전취발성 농축물은 column chromatography 수법으로 탄화수소 및 함산소 구분으로 분획되었으며, 함산소 구분은 column chromatography에 의해서 9개의 sub-fraction으로 다시 분획되었다. 전휘발성 농축물, 탄화수소 구분, 함산소 구분 및 9개의 sub-fraction은 모두 GC 및 GC-MS에 의해서 분석되었다. 분석결과, 총 162 성분이 분리 동정되었으며 이들은 61개의 탄화수소, 18개의 aldehyde, 18개의 ester, 41개의 alcohol, 3개의 ketone, 4개의 oxide, 8개의 산, 6개의 phenol 및 기타 3 성분으로 구성되었다.

• Bulletin of the Korean Chemical Society
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• 제30권10호
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• pp.2419-2421
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• 2009

A simple and efficient method has been developed for Knoevenagel condensation between aldehydes or ketones and active methylene group by stirring in methylene chloride at 60 ${^{\circ}C}$ under heterogeneous conditions using silica supported ammonium acetate. The products are obtained in excellent yields and are in a state of high purity. The structures of the products were confirmed by IR, $^1H$ NMR and mass spectral data and comparison with authentic samples available commercially.

• Bulletin of the Korean Chemical Society
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• 제32권10호
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• pp.3738-3742
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• 2011

Bismuth tribromide ($BiBr_3$) catalyzed Mannich-type reactions of N-acyliminium ions which generated in situ from N-benzyloxycarbonylamino p-tolylsulfones have been developed. In the presence of catalytic amount of $BiBr_3$, N-benzyloxycarbonylamino p-tolylsulfones prepared from aromatic and aliphatic aldehydes reacted with silyl enol ether and silyl enol ester under mild reaction conditions to afford N-Cbz-protected ${\beta}$-amino ketones and N-Cbz-protected ${\beta}$-amino esters in moderate to good yield, respectively.

• 생약학회지
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• 제24권3호
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• pp.192-196
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• 1993

Essential oil of the root of Angelica decursiva(Miq.) Fr. et Sav. (Umbelliferae) was investigated. Essential oil was obtained from the dried roots by steam distillation and fractionated by column chromatography. Each isolate or fraction was identified by GC, GC-MS and spectral analysis. It was found to contain ten monoterpenes such as ${\alpha}-pinene$ (7.0%) etc. Three hydrocarbons, two aldehydes, three sesquiterpenes, two sesquiterpene alcohols, one aromatic compounds, one ketone, isobonyl acetate and two lactones were tentatively identified.

• 한국식품저장유통학회지
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• 제13권1호
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• pp.108-114
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• 2006

본 연구에서는 다양한 생리적 기능성 외에 우리 국민에게 친숙한 향기를 지닌 냉이를 대상으로 식용 부위에 따른 향기성분을 SDE 및 SPM 방법으로 동시 분석하여 우리나라 고유 방향성 식물자원의 보다 효과적인 활용을 위한 기초 자료를 제시하고자 하였다. SDE 방법으로 포집한 정유 성분과 SPME 방법으로 추출한 headspace 성분간에는 상당한 차이를 보였는데, 정유에는 headspace 성분보다 상대적으로 탄화수소의 함량이 적었고, 케톤류, 알콜류, 에스테르류 및 유기산류의 함량이 높았다. 특히 phytol은 잎의 정유에서, ethyl acetate는 뿌리의 정유에서 상당이 높게 확인되었다. 냉이 특유의 향기에 기여하리라 추정되는 함유 황 화합물은 정유에서 높게 나타났다. 냉이의 정유 성분에는 알코올류와 유기산류의 함량이 특히 높은 것으로 확인되었으며, 이는 ph발of과 1,2-benzenedicarboxylic acid에 기인하였다. 냉이 headspace에는 다량의 탄화수소류가 함유되어 있었고, 에스테르류 및 유기산류의 함량을 미량으로 확인되었다.

• 한국조리학회지
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• 제13권1호
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• pp.119-128
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• 2007

식품의 조리과정 중에 부산물로 나오는 갑각류 폐기물을 이용하여 소스를 제조하여 canister system을 이용하여 농축한 후 GC/MSD를 이용해 휘발성 성분을 동정하였다. 그 결과 총 휘발성 성분의 개수는 72종이었으며 그 중 새우를 사용하여 만든 소스의 휘발성 성분이 45개로 가장 많았다. 새우 소스의 휘발성 성분은 10종의 alkane, 4종의 ketone, 3종의 aldehyde 및 7종의 alcohol이었으며 3-methyl-2-butanone, 2-pentanamine, isobutane, 3- methyl-butanal, furan, carbon disulfide, dimethyl sulfide가 주요한 성분이었다. 꽃게 소스에서는 18개의 휘발성 성분이 동정되었고, 4종의 alcohol류, 5종의 alkane류, 3종의 aldehyde류 및 ketone, acid와 amine이 각각 1종 검출되었으며, 2-methoxy ethanol, trimethyloxirane, 3-buten-1-ol이 꽃게 소스에서 주요한 휘발성 성분으로 나타났다. 바다가재 머리부분을 이용한 소스에서 16종의 휘발성 성분이 동정되었으며 alkane류 2종, aldehyde와 alcohol이 각각 1종씩 동정되었고 formic acid, 1-propanethiol, $\beta$-pinene, allyl sulfide가 주요한 향기 성분으로 나타났다. 바다가재 껍질을 이용한 소스에서 휘발성 성분이 18종 검출되었으며, acid류, pentane, 3-methyl 1-butanol 및 2, 4-dimethyl- 3-pentanone이 주요한 휘발성 성분인 것을 알 수 있었다.