• 한국물환경학회지
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• 제32권1호
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• pp.98-107
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• 2016

This study examined the effects of environmental conditions and the presence of refractory organic matter on oxidation rates of total organic carbon (TOC) measurements based on high temperature combustion and ultraviolet-sulfate methods. Spectroscopic indices for prediction of oxidation rates were also explored using the UV spectra and fluorescence excitation-emission matrix (EEM) of humic acids. Furthermore, optimum TOC instrument conditions were suggested by comparing oxidation rates of a standard TOC material under various conditions. Environmental conditions included salts, reduced ions, and suspended solids. Salts had the greatest influence on oxidation rates in the UV-sulfate method. However, no effect was detected in the high temperature combustion method. The UV-sulfate method showed lower humic substance oxidation rates, refractory natural organic matter, compared to the other methods. TOC oxidation rates for the UV-sulfate method were negatively correlated with higher specific-UV absorbance, humification index, and humic-like EEM peak intensities, suggesting that these spectroscopic indices could be used to predict TOC oxidation rates. TOC signals from instruments using the UV-sulfate method increased with increasing chamber temperature and increasing UV exposure durations. Signals were more sensitive to the former condition, suggesting that chamber temperature is important for improving the TOC oxidation rates of refractory organic matter.

• 분석과학
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• 제15권4호
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• pp.341-345
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• 2002

UV 광 중합 반응의 진행정도를 near-IR 분광학적 방법을 사용하여 관찰하였다. 광중합반응의 반응체는 4차 암모늄염을 포함하고 있는 아크릴 모노머를 사용하였으며 광 개시제로는 Darocur 1174를 사용하였다. 반응의 진척도는 광중합 반응의 정도를 나타내 주는 척도가 되는 중합 반응체인 아크릴 모노머의 -C=$CH_2$ 기와 관련된 흡수 띠인 1615 nm(6190 $cm^{-1}$)와 2105 nm(4750 $cm^{-1}$)에서 관찰된 띠 세기의 전환율로부터 구하였다. Near-IR 분광법이 광 중합 반응의 진행정도를 관찰하는데 효과적인 방법이 될 수 있음을 알 수 있었다.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.368.1-368.1
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• 2002

Mesaconitine and hypaconitine were isolated from Cho O and identified by the spectroscopic methods. The contents of alkaloid (mesaconitine. aconitine and hypaconitine) in the Cho O and its processed products were determined by high performance liquid chromatography. Processed 1 and 2 methods reduced the contents of alkaloid than those of processed 3 and commercially processed Aconiti Tuber powder. (omitted)

• 생약학회지
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• 제26권3호
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• pp.273-275
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• 1995

Two phenolic amides were isolated from the stem of Cocculus diversifolius (Menispermaceae) and identified as N-trans-feruloyl tyramine and N-trans-feruloyl 3-methyldopamine by spectroscopic methods.

• Archives of Pharmacal Research
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• 제12권4호
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• pp.310-312
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• 1989

Three new sesquiterpene alkaloids, tripterregeline, A, B and C were isolated from the stem bark of Tripterygium regelii and their partial structures were determined by various spectroscopic methods.

• Natural Product Sciences
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• 제7권1호
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• pp.21-22
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• 2001

A cytotoxic compound was purified from the flowers (46 g) of Paulownia tomentosa by normal column chromatography. As a result of the structure analysis by spectroscopic methods, the compound was identified as isoatriplicolide tiglate, which shows in vitro cytotoxicity.

• 생약학회지
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• 제31권2호
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• pp.249-251
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• 2000

From the whole plants of Amaranthus mangostanus L., rutin was isolated and identified by means of chemical and spectroscopic methods. This is the first isolation of rutin from this plant.

• Natural Product Sciences
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• 제18권1호
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• pp.13-15
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• 2012

Three lupane type triterpenoids were isolated from the methanol extract of Pyrus pyrifolia fruit peel through repeated silica gel column chromatography. Based on the spectroscopic methods, their structures were determined to be lupeol (1), betulin (2), and betulinic acid (3).

• Archives of Pharmacal Research
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• 제14권1호
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• pp.52-54
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• 1991

A new acylated monoterpene glucoside, galloylpaeoniflorin, was isolated from Paeony root. The structure was determined by chemical and spectroscopic methods.

• 약학회지
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• 제37권4호
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• pp.365-369
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• 1993

Five phenolic compounds have been isolated from the stems and leaves of Rosa rugosa Thunb. (Rosaceae) in Korea. They were methyl gallate and catechin from the stems, and quercetin, methyl gallate and hyperin from the leaves respectively. The structures were established by spectroscopic and chemical methods.