• 한국환경농학회지
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• 제30권4호
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• pp.459-465
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• 2011

BACKGROUND: Nowadays, Chemical antiseptics have become great problems for health and environmental, so that developing of new substitutes for chemical antiseptics is more and more important. Natural product is a kind of environment-friendly additive that could be used as antiseptic in food industry. Thuja orientalis cv Aurea Nana is a gymnospermous plant of the family Cupressaceae, native to northwestern China and widely naturalised elsewhere in Korea and Japan. This study was aimed to investigate the antibacterial potential of various organic extracts from T. orientalis cones against some food-borne and food-spoilage bacteria. METHODS AND RESULTS: Hexane extract (HE), chloroform extract (CE), ethyl acetate extract (EAE) and methanol extract (ME) were obtained from female cones of T. orientalis. The antibacterial activities of various extracts were tested by standard agar diffusion and minimum inhibitory concentrations (MICs) against five gram-positive and six gram-negative bacteria. Cell viability and morphology change of L. monocytogenes ATCC 10943 treated with hexane extract were also observed. The various extracts displayed remarkable antibacterial effects against all the gram-positive bacteria but did not show any effect against the gram-negative bacteria. Hexane extract has the highest inhibitory effect on cell viability of L. monocytogenes ATCC 10943. SEM observation also demonstrated the damaging effect of the hexane extract on the morphology of L. monocytogenes ATCC 10943 at the minimum inhibitory concentration. CONCLUSION(s): The tested gram-positive bacteria were significantly inhibited by organic extracts of T. orientalis cone. Hexane extract was the most potent against Listeria monocytogenes ATCC 10943, as evidenced by the lowest MIC level and the complete inhibition of cell viability within shortest exposure time, along with SEM observation.

• 한국약용작물학회지
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• 제25권5호
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• pp.282-289
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• 2017

Background: To investigate the possibility of using Asarum sieboldii as an environment-friendly fumigant for protecting organic cultural heritages, the inhibitory effect of A. sieboldii extract against wood rot fungi on Hanji was examined. Methods and Results: The physical, optical, and morphological properties of Hanji inoculated with Trametes versicolor and Tyromyces palustris, and exposed to the n-hexane fraction of A. sieboldii extract, were measured. The physical properties were expressed as weight loss, zero-span tensile strength and viscosity and the optical properties were depicted by luminance and chromaticity ($L^*$, $a^*$, and $b^*$). The results showed that, the n-hexane fraction of A. sieboldii extract inhibited the growth of fungi on Hanji, and preserved its condition. At a concentration of 25 mg, the n-hexane fraction of A. sieboldii extract maintained zero-span tensile strength, increased viscosity, and restricted discoloration of Hanji. It also was confirmed that the weight of fungi infested Hanji exposed to the extract did not decrease. Scanning electron microscopic images revealed that the spores and hyphae of T. versicolor and T. palustris were not present on Hanji during treatment with > 25 mg of the n-hexane fraction of A. sieboldii extract. Conclusions: These results indicate that the n-hexane fraction of A. sieboldii extract by virtue of its antifungal effectiveness may help in preserving Korean paper cultural heritages, including Hanji.

• 분석과학
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• 제19권6호
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• pp.512-518
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• 2006

화재원인물질을 규명하기 위해 화재현장에서 수거된 물을 포함한 증거물로부터 석유류를 용매추출하여 기체크로마토그래피법으로 분석하였다. 다량의 수분을 포함한 증거물에서 석유류를 추출하기 위해, HPLC 용 n-hexane을 10.0 mL를 가하여 30분간 흔들어준 다음 일정시간 방치한 후 n-hexane 층을 분리하고 기체크로마토그래피에 주입하여 크로마토그램을 얻었다. 얻어진 시료의 크로마토그램과 시너, 휘발유, 난방용 등유, 보일러 등유 및 경유를 n-hexane에 첨가하여 만든 인공시료의 크로마토그램과 비교하였다. 시료의 크로마토그램은 비교적 끓는점이 낮은 시너와 휘발유의 크로마토그램과 확연히 차이가 났으며, 난방용 등유와 보일러용 등유는 머무름 시간에 따라 다른 피크 패턴을 보였다. 이에 비해 경유의 크로마토그램과는 유사한 피크패턴을 보였고, 시료에 일정량의 경유를 첨가한 후 측정한 시료의 크로마토그램에서는 특징적인 피크의 면적이 증가하는 현상을 관찰할 수 있어 시료에 포함된 석유류가 경유라고 예측할 수 있었다.

• 한국식품과학회지
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• 제4권3호
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• pp.206-212
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• 1972

Hexane 및 ethanol을 이용(利用)하여 쌀알미립(米粒)에서 추출(抽出)한 유지(油脂)을 Folch's법(法)에 의해 정제(精製)하고, 이들을 자외선조사(紫外線照射) 또는 $40^{\circ}C$암소(暗所)에 저장하여 쌀유지(油脂)의 산화양상(酸化樣相)을 경시적(經時的)으로 살펴 본 바, 다음과 같은 결과(結果)를 얻었다. 1. 산소흡수(酸素吸收)에 의한 중량증가현상(重量增加現像)은 자외선조사(紫外線照射)에 의하여, 처리(處理) 3일(日) 이내(以內)에 현저한 중량증가(重量增加) 원래(元來) 시료중량(試料重量)의 0.6% 이상)를 보였으나 , $40^{\circ}C$암소(暗所)에서는 45일(日) 이후(以後)에 비로소 현저한 중량증가(重量增加)가 있었다. 각처리별(各處理別) 유도기간(誘導期間)은 hexane유출유지(抽出油脂)가 자외선조사(紫外線照射)에서는 1일(日), $40^{\circ}C$암소(暗所)에서는 30일(日)이었고, ethanol유출유지(抽出油脂)는 자외선조사紫外線照射에서는 2(日), $40^{\circ}C$암소(暗所)에서는 40일(日)이었으며, hexane유출유지(抽出油脂)가 ethanol유출유지(抽出油脂)보다 그 안정성(安定性)이 다소 낮았다. 한편 각 처리별 변패취는 유도기간(誘導期間)보다 약간 늦게 확인 되었다. 2. 각처리별(各處理別)로 총(總)carbonyl화합물(化合物) 및 malonaldehyde(M.A.)의 변화(變化)를 살펴 본 바, 자외선조사구(紫外線照射區)에서는 carbonyl가(價)가 $2{\sim}4$일(日)째, M.A. 는 7일경(日頃)에 그생성량(生成量)이 각각 정점(頂點)을 이루었다가 다시 감소(減少)되었고,$40^{\circ}C$암소(暗所)에서는 carbonyl가(價) 및 M.T. 생성량(生成量) 공(共)히 55일(日)까지 서서히(徐徐)히 증가(增加)하였다. 3. 전체적으로 보아 hexane유출유지(抽出油脂)가 ethanol유출유지(抽出油脂)보다 산화반응(酸化反應)이 더 빨랐으며 이는 지방산조성(脂肪酸組成) 및 미확인(未確認)된 항산화물질(抗酸化物質)의 존재(存在)에 의한 가능성(可能性)으로 고려된다. 그리고 자외선조사(紫外線照射)는 이미 알려진 바 있지만 유지(油脂)의 산화(酸化)를 급격히 촉진(促進)시키고 있었다. 4. Hexane에 의해 유출(抽出)된 쌀유지(油脂)를 유출직후(油出直後)와 $40^{\circ}C$ 55일간 저장처리(貯藏處理)한 후의 지방산조성(脂肪酸組成)을 살펴본 바 linoleic 및 linolenic acid가 현저히 감소(減少)하였고, 상대적(相對的)으로 oleic, stearic, palmitic acid 등(等)이 증가(增加)하였다.

• Bulletin of the Korean Chemical Society
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• 제34권9호
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• pp.2623-2628
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• 2013

Three di-acyl chlolide reagents, adipoyl chloride, terephthaloyl chloride and isophthaloyl chloride, were used as spacer reagents to prepare bonded type of three cellulose (3,5-dimethylphenyl)carbamate (CDMPC) chiral stationary phases (CSPs). The CDMPC CSPs were prepared using these three acid chlorides as spacer agents at the 6-position of the primary hydroxyl group on the glucose unit of cellulose regioselectively. The chiral recognition ability of the prepared CSPs for five racemates was evaluated by normal-phase high-performance liquid chromatography (HPLC) with the following mobile phases: hexane/isopropanol (IPA), hexane/IPA/tetrahydrofuran (THF) and hexane/IPA/chloroform. The result showed that these prepared CSPs can be used in THF and chloroform solutions and the chiral recognition abilities of the CSPs were improved depending on the eluents and chiral samples.

• 산업기술연구
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• 제20권A호
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• pp.203-209
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• 2000

The fluctuation integrals which give useful information in the structure of solution are associated with the mixed direct correlation integral ($C_{12}$) known. Using its weighted arithmetic mean of $C_{11}$ and $C_{22}$ and the activity coefficient model, the fluctuation integrals on solute-solute, solvent-solute, and solvent-solvent can be calculated in the function of mole fraction. In this work, several binary mixtures containing c-hexane were tested and the results on the fluctuation integrals were rather good.

• Environmental Analysis Health and Toxicology
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• 제1권1호
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• pp.55-60
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• 1986

The writer measured methemoglobin formation with solvent (n-hexane, ethylacetate and methanol) organic extracts from the sediments of the Wonju stream run through Wonju city on Octover 2nd, 1985. Hemoglobin was converted to methemoglobin with the n-hexane extract obtained from the sediment of the St. C and St. D was polluted industrial wastewater, but not with that from the St. B was polluted with the urban wastewater. The formation of methemoglobin was remarkable with the all solvent extracts from the sediment of the uper stream of the Wonju stream. Doses of the solvent extracts for 20% methemoglobin formation in the researched Wonju streams were as follows; 0.095～0.28 mg/m.$\ell$ in n-hexane extract. 0.85-1.3 mg/ m$\ell$ in methanol extract and 1.95～2.80 mg/m$\ell$ in ethylacetate extract.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2001년도 추계학술발표대회
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• pp.693-696
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• 2001

Ketoprofen racemate를 각 enantiomer로 분리하고자 이동상의 조성을 변화하여 실험을 수행한 결과, hexane과 t-BME의 비가 60/40(%v/v)인 경우 적합한 체류시간과 분리도를 얻을 수 있었으며, 이동상의 acetic aicd를 0.1%(v/v) 첨가한 경우 낮은 pH에서 분리가 효율적으로 일어났다. 또한, 시료의 농도를 변화시켜 실험을 수행한 경우, 2000ppm까지는 선택도에 큰 변화없이 분리를 수행할 수 있었으나, 농도가 1000ppm 이상인 경우 분리도가 1.00미만으로 낮은 값을 보였다.

• 생명과학회지
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• 제9권2호
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• pp.207-211
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• 1999

당뇨에 대한 황정의 약효가 알려지면서 황정의 생리활성 연구가 많이 진행되고 있다. 따라서 본 연구에서는 황정 추출물의 hexane층에서 생리활성 물질로 기대되는 새로운 화합물 I를 분리하고, 분리한 화합물의 화학적인 구조를 분광학적인 방법에 의하여 확인하였다. 1H-nmr, 13C-nmr, DEPT135, COSY, HMQC, HMBC 스펙트럼 및 MS 스펙트럼으로 확인하여 화합물 I의 구조가 9,12-(9E, 12E)-octadecadienoic acid 임을 알 수 있었다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2006년도 추계학술대회
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• pp.58-61
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• 2006

n-Pentane and n-hexane, previously regarded as non-hydrate formers, are found to form structure H hydrate in mixtures with 2,2-dimethylbutane. Even though they are thought to be too large to fit into the largest cage of the structure H hydrate, powder XRD and NMR measurements show that they form gas hydrates in mixtures with other sH hydrate former. These findings are of fundamental interest and also will impact the composition and location of natural gas hydrates and their potential as global energy resource and climate change materials.