ABSTRACT A new ionic liquid composite mesoporous polymer (ILCMP) was synthesized by one-pot copol... more ABSTRACT A new ionic liquid composite mesoporous polymer (ILCMP) was synthesized by one-pot copolymerization. The obtained ILCMP with good morphology, good pore diameter distribution, and high adsorption capacity was successfully applied as the sorbent in solid-phase extraction (SPE) to extract and separate quercitrin and myricetin from Chamaecyparis obtusa. 87.8–101.8% of satisfactory recoveries were obtained with RSDs less than 6.2% and the amounts of quercitrin and myricetin in Chamaecyparis obtusa were 0.38 and 0.12 mg/g, respectively. The proposed ILCMP-SPE-HPLC method was applied for the separation, purification, and determination of flavonoids from natural products.
Page 1. SEPARATION SCIENCE AND TECHNOLOGY, 30(19), pp. 3615-3628, 1995 Asymmetry of Peak Shapes i... more Page 1. SEPARATION SCIENCE AND TECHNOLOGY, 30(19), pp. 3615-3628, 1995 Asymmetry of Peak Shapes in Linear Gas-Liquid Chroma tog rap h y KYUNG HO ROW* DEPARTMENT OF CHEMICAL ENGINEERING INHA UNIVERSITY 253 YONGHYUN-DONG. ...
ABSTRACT Headspace single-drop microextraction (HS-SDME) was used to extract five terpenoids (α-t... more ABSTRACT Headspace single-drop microextraction (HS-SDME) was used to extract five terpenoids (α-terpinene, γ-terpinene, linalool, α-terpineol, and terpinyl acetate) from powdered Chamaecyparis obtusa leaves. The terpenoids were determined by gas chromatography with flame ionization detection. Under the optimized conditions, oleyl alcohol efficiently extracted the analytes from the leaves within 20 min at 100°C. The results showed that the amounts of α-terpinene, γ-terpinene, linalool, α-terpineol, and terpinyl acetate extracted from the samples were 2.19, 3.68, 0.11, 0.87, and 22.35 µg/g, respectively. Compared to microextraction of the compounds from the sample solution, the new technique had fewer steps. The method also had similar extraction properties as heat reflux extraction, but required a smaller sample volume and less time.
ABSTRACT LARCH is een kennissysteem dat de overlevingskans van diersoorten bepaalt op basis van d... more ABSTRACT LARCH is een kennissysteem dat de overlevingskans van diersoorten bepaalt op basis van de ruimtelijke configuratie van de leefgebieden en de kwaliteit daarvan. Het wordt vooral toegepast bij het ontwerp en de toetsing van de ruimtelijke inrichting vanbestaande en toekomstige landschappen. De analyse bestaat uit twee stappen: habitatmodellering en ruimtelijke modellering. In dit rapport is een voorstel uitgewerkt voor het verbeteren van de habitatmodellering met behulp van ruimtelijke basisbestanden.
The plate model was used to clarify the characteristics of a moving feed-injection system. The se... more The plate model was used to clarify the characteristics of a moving feed-injection system. The selected sample system was gas-liquid chromatography for the separation of close-boiling components such as diethyl ether and dichloro-methane. The solution of the model for the moving feed-injection system with simplified assumptions was obtained by summing up a series of solutions for a single pulse of
ABSTRACT A new ionic liquid composite mesoporous polymer (ILCMP) was synthesized by one-pot copol... more ABSTRACT A new ionic liquid composite mesoporous polymer (ILCMP) was synthesized by one-pot copolymerization. The obtained ILCMP with good morphology, good pore diameter distribution, and high adsorption capacity was successfully applied as the sorbent in solid-phase extraction (SPE) to extract and separate quercitrin and myricetin from Chamaecyparis obtusa. 87.8–101.8% of satisfactory recoveries were obtained with RSDs less than 6.2% and the amounts of quercitrin and myricetin in Chamaecyparis obtusa were 0.38 and 0.12 mg/g, respectively. The proposed ILCMP-SPE-HPLC method was applied for the separation, purification, and determination of flavonoids from natural products.
Page 1. SEPARATION SCIENCE AND TECHNOLOGY, 30(19), pp. 3615-3628, 1995 Asymmetry of Peak Shapes i... more Page 1. SEPARATION SCIENCE AND TECHNOLOGY, 30(19), pp. 3615-3628, 1995 Asymmetry of Peak Shapes in Linear Gas-Liquid Chroma tog rap h y KYUNG HO ROW* DEPARTMENT OF CHEMICAL ENGINEERING INHA UNIVERSITY 253 YONGHYUN-DONG. ...
ABSTRACT Headspace single-drop microextraction (HS-SDME) was used to extract five terpenoids (α-t... more ABSTRACT Headspace single-drop microextraction (HS-SDME) was used to extract five terpenoids (α-terpinene, γ-terpinene, linalool, α-terpineol, and terpinyl acetate) from powdered Chamaecyparis obtusa leaves. The terpenoids were determined by gas chromatography with flame ionization detection. Under the optimized conditions, oleyl alcohol efficiently extracted the analytes from the leaves within 20 min at 100°C. The results showed that the amounts of α-terpinene, γ-terpinene, linalool, α-terpineol, and terpinyl acetate extracted from the samples were 2.19, 3.68, 0.11, 0.87, and 22.35 µg/g, respectively. Compared to microextraction of the compounds from the sample solution, the new technique had fewer steps. The method also had similar extraction properties as heat reflux extraction, but required a smaller sample volume and less time.
ABSTRACT LARCH is een kennissysteem dat de overlevingskans van diersoorten bepaalt op basis van d... more ABSTRACT LARCH is een kennissysteem dat de overlevingskans van diersoorten bepaalt op basis van de ruimtelijke configuratie van de leefgebieden en de kwaliteit daarvan. Het wordt vooral toegepast bij het ontwerp en de toetsing van de ruimtelijke inrichting vanbestaande en toekomstige landschappen. De analyse bestaat uit twee stappen: habitatmodellering en ruimtelijke modellering. In dit rapport is een voorstel uitgewerkt voor het verbeteren van de habitatmodellering met behulp van ruimtelijke basisbestanden.
The plate model was used to clarify the characteristics of a moving feed-injection system. The se... more The plate model was used to clarify the characteristics of a moving feed-injection system. The selected sample system was gas-liquid chromatography for the separation of close-boiling components such as diethyl ether and dichloro-methane. The solution of the model for the moving feed-injection system with simplified assumptions was obtained by summing up a series of solutions for a single pulse of
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