• Journal of Ginseng Research
• /
• 제24권2호
• /
• pp.64-67
• /
• 2000

본 연구에서는 홍삼에 함유되어 있는 총 phenolic화합물을 정량하기 위하여 Folin-Denis방법을 사용하였으며, 이 때 정량에 방해를 줄 수 있는 물질에 대해서 조사하였고 홍삼분말로부터 phenolic 화합물 추출조건을 조사하였다. 아미노산중에서는 tyrosine, cystein 및 tryptophan이 영향을 미쳤고, 여러 가지 유기산, 당류 및 ginsenosides는 거의 영향을 미치지 않았다. 비타민 중에서는 vitimln B$_{12}$, d-biotin, D-pantothenic acid, niacinamide, nicotinic acid, vitamine A palmitate, vitamine D$_3$ 등을 제외한 비타민은 발색에 영향을 미쳤다. 홍삼으로부터 phenolic 화합물을 추출하기 위한 추출조건은 60% ethanol을 사용해서 80。C에서 1-2시간씩 3회 정도 추출이 적당하다고 판단된다.

• 한국식품영양과학회지
• /
• 제29권5호
• /
• pp.943-947
• /
• 2000

The purpose of this study was to investigate the extraction method of phenolic compounds from Rubus coreanum and antioxidative activity. antioxidative activities of Rubus coreanum were tested with ability of donating hydrogen to DPPH, and HPLC, fluorometry which measure the amount of MDA after reacting linoleic acid with $H_2O$$_2$, and LDL with $H_2O$$_2$ and FeCl$_2$. The most suitable extraction conditions of the phenolic compounds from Rubus coreanum was 3 times with 60% ethanol, and the yield of extract containing 35% moisture was 15.28%. In extraction efficacy of phenolic compounds, 60% ethanol was superior to water as extraction solvent, and extraction efficacy with 60% ethanol did not differ from disolving by water after evaporation of 60% ethanol extract. 60% ethanol extract of Rubus coreanum had an ability of hydrogen donating to DPPH, MDA determination showed the antioxidative effect with inhibition ratio of 77.91% on linoleic acid oxidation by addition of Rubus coreanum extract with the concentration of 1.500 ppm. and about 65.74% of LDL oxidation was inhibited by addition of 1,000 ppm.

• 한국환경과학회지
• /
• 제9권5호
• /
• pp.437-441
• /
• 2000

A study on the removal of Pb ion from Pb-contaminated soil was carried out using ex-site extraction process. Tartaric acid (TA) and iminodiacetic acid sodium salt(IDA) as a washing agent were evaluated as a function of concentration reaction time mixing ratio of washing agent and recycling of washing agent. TA showed a better extraction performance than IDA. The optimum washing condition of TA and IDA were in the ratio of 1:15 and 1:20 between soil and acid solution during 1 hr reaction. The total concentrations of Pb ion by TA and IDA at three repeated extraction were 368.8 ppm and 267.5 ppm respectively. The recovery of Pb ion from washing solution was achieved by adding calcium hydroxide and sodium sulfide form the precipitation of lead hydroxide and lead sulfide and optimum amounts of sodium sulfide and calcium hydroxide were 7 g/$\ell$ for the TA washing solution and 4 g/$\ell$, 5g/$\ell$ for the IDA washing solution respectively. The efficiency of recycle for TA and IDA washing solution were 78.8% , 95.1%, and 89.2%, 96.6% at third extractions under $Na_2S$ and $Ca(OH)_2$, respectively.

• 한국방사성폐기물학회:학술대회논문집
• /
• 한국방사성폐기물학회 2005년도 춘계 학술대회
• /
• pp.278-283
• /
• 2005

원자력 발전소에서 발생한 시멘트 또는 파라핀 고화체 중의 핵종분석을 하기 위해서는 시료의 용액화가 필요하다. 이를 위하여 산 침출법과 극초단파 산분해법을 이용하여 SRM(standard reference material)을 용액화한 다음 AAS와 ICP-AES를 사용하여 용액 속의 원소들을 분석 비교하였다. 완전 용액화가 가능한 극초단파 산분해법으로 처리한 결과와 일치하는 산 침출조건을 제안하여 많은 양의 시료를 한 번에 처리할 수 있는 산 침출법으로 방사성 고화체 시료 중의 비휘발성핵종분석을 위한 고화체 용액화 방법을 확립하였다. 방사성 고화체의 산 침출시마다 Re을 첨가하여 시료 전처리 단계에서의 회수율은 $80\%$ 이상으로 나타났다.

• 한국식품과학회지
• /
• 제36권3호
• /
• pp.403-409
• /
• 2004

복합음료의 재료인 양파, 솔잎, 뽕잎, 당귀, 감초, 대추를 물과 methanol로 상온에서 각각 추출하여 전자공여능, thiosulfinate함량, ascorbic acid 함량, SOD유사황성 및 pH 1.2와 3.0에서 아질산 소거능 등을 조사하였다. SOD 유사활성은 모든 시료에서 methanol 추출이 우수하였고, 아질산 소거능은 물 추출이 우수하였고 다른 기능성 항목은 재료에 따라 추출방법에 대한 우열의 일정한 경향을 보이지 않았다. 그러나 3 hr동안 hard boil한 물추출이 thiosulfinate의 함량을 제외한 모든 기능성을 상온에서 물추출보다 증가 시켰고, 특히 상온에서 methane이 물 추출보다 높은 값을 보였던 양파, 뽕잎, 대추의 전자공여능과 당귀의 ascorbic acid 함량은 methanol 추출보다도 높은 추출 효율을 보였으므로 hard boil에 의한 물추출이 효과적인 것으로 나타났다. 단 휘발성인 thiosulfinate는 온도의 상승에 따라 그 함량이 급격한 감소를 보였으므로 이 성분은 저온에서 추출하여 혼합하는 방법을 모색해야 할 것으로 여겨진다. 아울러 hard boil에 의한 적정한 추출시간을 조사한 결과, 6 hr이면 thiosulfinate를 제외한 기능성분은 거의 용출 되어지는 것으로 밝혀졌다. 저장중의 변화를 조사한 결과, 저온저장시 ascorbic acid만이 약간의 손실이 더 있는 편이고 다른 기능성 성분은 상온 저장과 거의 같거나 저온저장이 유리하였다. 이상의 결과로 양파의 기능성 강화 복합음료의 제조는 thiosulfinate를 제외하고 6 hr 물로 고와서 추출하고 저온 저장하여야 한다는 것을 알 수 있었다.

• 자원리싸이클링
• /
• 제12권1호
• /
• pp.25-32
• /
• 2003

도금폐수로부터 철, 구리, 아연 및 니켈 등 중금속을 분리ㆍ회수하기 위한 용매추출시 추출제의 종류 및 평형 pH에 따른 각 금속의 분리효과를 조사하였다. 실험결과 아연은 추출제로 PC-88A가 가장 효과적이며, pH 2.5에서 100% 추출할 수 있다. 구리와 니켈은 LIX 84를 사용하여 추출하면 각각 pH2에서 100% 그리고 pH4～5에서 90% 이상 추출할 수 있다. 한편, 중금속이 혼재한산ㆍ알칼리계 도금폐수에 대한 용매추출에서는 먼저 3가 철을 지방산인 20％의 Naphthenic acid나 10％의 Versatic acid-10로 pH2∼2.5 부근에서 분리ㆍ회수하고, 그 다음에 3%의 LIX 84를 사용하여 pH2에서 구리를 용매추출하여 분리하고 난 후 20% PC-88A 로 pH2.5∼3에서 아연을 용매추출하여 회수하면 수상에 니켈만이 잔류하여 각각의 금속분리가 가능하다.

• 한국식품저장유통학회지
• /
• 제5권1호
• /
• pp.81-87
• /
• 1998

Antimicrobial activities of the extracts from spices microorganisms related to kimchi fermentation were investigated. 32 kinds of spices such as allspice, mount, basil, bay leaves, caraway, cardamon, celery, chilli powder, chives, cinnamon, clover, coriander, cumin, dill, fennel, garlic, horseradish, marjorarm, mugwort, mustard, nutmeg, onion, oregano, paprika, parsely, pepper, peppermint, rosemary, sage, tarragon, thyme and tumeric were extracted with water, ethyl ether, ethyl acetate and ethanol. Fractions were tested for antimicrobial activities against Lactobacillus plantarum and Leuconostoc mesenteroides, The extracts of 28 kinds of spices except caraway, cardamon, paprika and tarragon by water extraction, those of 29 kinds except arrowroot, paprika and tarragon by ethyl ether extraction, those of 30 kinds except paprika and tarragon by ethyl acetate extraction, and those of 29 kinds except clover, paprika and tarragon by ethanol extraction showed strong antimicrobial activities against Lactobacillus plantarum. On the other hand, the extracts of 28 kinds of spices except caraway, cardamon, paprika and thyme by water extraction, those of 27 kinds except cardamon, cumin, paprika, tarragon and thyme by ethyl ether extraction, thou of 30 kinds except paprika and thyme by ethyl acetate extraction, and those of 28 kinds except cardamon, cumin, paprika and thyme by ethanol extraction showed strong antimicrobial activities against Leuconostoc mesenteroides.

• Nuclear Engineering and Technology
• /
• 제53권4호
• /
• pp.1218-1223
• /
• 2021

A hydrophobic ionic liquid including an amino moiety ([DiOcAPmim][NTf₂]) was synthesized. Its extraction behaviors towards Pd(II), Ru(III), Rh(III) were investigated in nitric acid aqueous solution as a function of contact time, effect of concentration of nitric acid, effect of temperature, and effect of co-existing metal ions. The extraction kinetics of Pd(II) was fairly fast and extraction equilibrium can be attained within only 5 min under the [HNO₃] = 2.05 M. When [HNO₃]< 1 M, the extraction percentage of Pd(II), Ru(III), Rh(III) were all above 80%. When [HNO₃] reached 2 M, all of the extraction percentage decreased and in an order of Pd(II)>Ru(III)>Rh(III). When [HNO₃]> 2 M, the extraction performance gradually recovered. The effect of temperature can slightly affect the extraction performance of Pd(II). Furthermore, in simulated high-level liquid waste, [DiOcAPmim][NTf₂] showed a better preference towards Pd(II) under the interference of various other co-existing metal ions.

• 한국식품영양학회지
• /
• 제12권2호
• /
• pp.119-123
• /
• 1999

Test of the optimum condition of solid phase micro extraction(SPME) was performed by use of 5 vol-atile components in dilute aqueous solution. Volatile components of Sancho(Zanthoxylum schinifolium) were isolated by SPME method and were analyzed by GC/MSD and compared with volatile compone-nts isolated by simultaneous distillation extraction (SDE) method. Total 31 components were identified by comparing gas chromatography retention time and mass spectral data. The major compounds were limonene geranyl acetate $\beta$-phellandrene phellandral mycene linalool rose oxide caproic acid and caprylic acid SPME sampling procedure was found to be a good method for qualitative analysis of the volatile components.

• Biotechnology and Bioprocess Engineering:BBE
• /
• 제6권6호
• /
• pp.386-394
• /
• 2001

Carboxylic acids are examples of compounds with wide industrial applications and high potential, This article presents the principles of reactive extraction along with the character-istics of tertiary amine extractants, while is given on considering the effect of the amine class and chain length, As such a brief overview the current research on reactive extraction, including the recovery of citric acid, selective amine-based extraction , and extractive fermentation is given. When discussing extractive fermentation strategies for reducing solvent toxicity are also suggested based on specific examples. Finally, solvent regeneration and stripping of extracted acid explained.