• Analytical Science and Technology
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• v.20 no.2
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• pp.164-169
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• 2007

A selective analytical method of LC/MS/MS has been applied to determine the levels of acrylamide in food products. Food samples were 17 including 6 potato chips, and 11 french fries. The analysis of food samples includes extraction with DDDW, clean-up using C18 and mixed ion exchange SPE cartridges and detection by liquid chromatography tandem mass spectrometry. The mobile phase was a mixture of 0.1 % acetic acid and 0.5 % methanol in water. The target ions were identified and determined by ESI mass spectrometer. The overall recoveries were ranged from 91 % to 101 % and the limit of quantitation was $10{\mu}g/kg$. Depending on food kinds, the levels of acrylamide were variable and the average was 0.71 mg/kg for potato chips, and 0.34 mg/kg for french fries.

• Journal of the Korean Society of Clothing and Textiles
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• v.38 no.1
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• pp.110-122
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• 2014

This study examined hwangbek dyeability for cotton, silk, and wool from different tree species and origin as well as their berberine and palmatine content. A total of 12 different hwangbek were examined, six purchased directly from different locations of China and six purchased from the Seoul Medicine Market. Hwangbek purchased from China were 3 Kwanhwangbek (Phellodendron amurense Rupr.) from Jilin, Liaoning, Heilongjiang and 3 Chunhwangbek (Phellodendron chinense Schneid.) from Sichuan, Yunnan, and Guangxi. Hwangbek purchased from the Seoul Medicine Market included 3 hwangbek that originated from Korea and 3 hwangbek imported from China. We extracted 2.5g of each hwangbek into 500mL of water for 60 min at $80^{\circ}C$. Dyeing was conducted using the IR dyeing machine for 30min at $55^{\circ}C$ using a 1:100 liquor ratio. Cotton was mordanted using tannic acid followed by potassium antimonyl tartrate trihydrate treatment before dyeing. Berberine and palmatine pigments in hwangbek were identified with the HPLC-DAD-MS instrument and the amount of pigment was quantified using an ion chromatogram. The results indicated that the K/S values of dyed fabrics were highly related to the amount of pigment in hwangbek used for dyeing.

• The Korean Journal of Food And Nutrition
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• v.19 no.3
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• pp.267-270
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• 2006

In Korea, for a long time Rhus verniciflua has traditionally been used as an herbal medicines plants. A stem of Rhus verniciflua has been used to treat gastrointestinal trouble with in form of boiled chicken as a folk medicine. But it has been recognized as an extremely active allergen causing skin reactions. The chief allergenic component, urushiol, is found within the oleoresinous sap of Rhus verniciflua. Most components of urushiol have unsaturated side chains. These unsaturated side chains of urushiol are important to polymerization of these natural products. The urushiol components in Korean lacquer were isolated by reversed phase HPLC. The molecular weight of purified urushiol was determined as 340 from mass analysis. This compound was identified as Heptadecatetraenyl catechol (MW 340).