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정혜원,S. Kay Obendorf 한국의류학회 1992 한국의류학회지 Vol.16 No.1
The influences of hydrophilic treatment of the PET fabric on soiling and detergency of triolein were studied. The amounts of residual triolein were determined by radiotracer analysis, and distributions of the unsaturated oils on the fabric were evaluated by backscattered electron images. The removal of triolein was increased when the PET fabrics were treated. SRP pretreatment was more effective on the oily soil removal than the of addition of SRP in the detergent. The oily soil of triolein only was packed between the fibers, but mixed soil was distributed around the fibers. When the mixed soil was used, detergent solution could penetrate the continuous interfiber capillaries, this would be one of the reasons that mixed soil was removed more extensively.
Tensiometric 법을 이용한 친수화 PET 섬유의 표면특성 분석
정혜원,S . Kay Obendorf ( Hae Won Chung,S . Kay Obendorf ) 한국의류학회 1991 한국의류학회지 Vol.15 No.4
The dispersion and polar force components of the surface free energy of PET fibers untreated and treated with hydrophilic chemicals, such as nonionic-soil release polymer (SRP), anionic, nonionic and hydrophilic silicone, were determined using harmonic-mean and geometric-mean methods. Contact angles of water and methylene iodide on the fibers were determined from the adhesion tensions using tensiometric method. Fibers treated with hydrophilic chemicals have the increased polar force component and the decreased dispersion force component. The adhesion tensions of triolein for the hydrophilic treated fibers were smaller than that for untreated fiber.
염료추출 및 분석 조건에 따른 꼭두서니의 색소성분 분리 거동
안춘순,Obendorf, S. Kay 한국의류학회 2003 한국의류학회지 Vol.27 No.11
This research was aimed to establish the standard extraction and analytical procedures for examining the chromophoric substance in madder root with the ultimate goal of identifying the dyes in badly faded textiles of archaeological origin. The separation temperature of gas chromatography, pH and other extraction conditions were tested. The results were as follow: The suitable separation temperature for the GC cappillary column was 50~305℃, and methanol was a good GC solvent for both standard alizarin and madder extraction. The best extraction of madder was achieved by 90 min soaking in room temperature followed by filtration and the actual heat extraction procedure. The best pH for extracting alizarin was pH 3 and pH 5 alizarin was not detectible. Only alizarin and no purpurin was found in the extraction of the currently used madder plant.
Ahn, Cheunsoon,Zeng, Xia,Obendorf, S Kay Sage Science Press 2015 Textile Research Journal Vol. No.
<P>H<SUB>2</SUB>O<SUB>2</SUB>/ultraviolet (UV) radiation treatment was proposed to simulate burial-induced degradation of natural dyes. The method was applied to the major pigments of <I>Phellodendron</I> bark, madder, and indigo plant, and their silk dyeings, and the degraded samples were analyzed using high-performance liquid chromatography-diode array detector-mass selective detector (HPLC-DAD-MS). Retention times of the HPLC chromatogram, UV-visible λ<SUB>max</SUB> obtained from DAD analysis, and major ion detected by the MS analysis were used to identify berberine, palmatine, alizarin, purpurin, indigotin, and indirubin included in dye solution and the extraction from silk dyeing. Alizarin, purpurin, and indirubin were more susceptible to degradation by H<SUB>2</SUB>O<SUB>2</SUB>/UV than berberine and palmatine. Indigotin was completely degraded with 5 minutes of treatment, producing isatin as the degradation product. Alizarin, purpurin, and indigotin were more resistant to degradation when they were affixed to the fibers.</P>
Thermal degradation of natural dyes and their analysis using HPLC-DAD-MS
안춘순,Xia Zeng,이룡춘,S Kay Obendorf 한국의류학회 2014 Fashion and Textiles Vol.1 No.1
Berberine, palmatine, alizarin, purpurin, indigotin, and indirubin which were the major coloring compounds of Phellodendron bark, madder, and indigo plant were thermally degraded in 100°C oven in liquid dye form and also in silk dyed with five of these pigments. A mixed dye solution of six coloring compounds was prepared in DMSO solution and was thermally degraded for up to 7 days. Silk were dyed using either a mixed dye solution of five dyes or individual dye solutions and each were degraded for 7 and 14 days, respectively, and the dye was extracted from the samples for the HPLC analysis. The concentration of coloring compounds in the degraded samples were analyzed by HPLC-DAD-MS and the color difference (ΔE) of the degraded silk was examined using a spectro-colorimeter. Alizarin and purpurin were more resistance to degradation than other coloring compounds both when in solution form and in silk dyeings. And such result was verified by the color difference measurement of the degraded silk dyed with individual dye solution. The resistance of alizarin and purpurin to thermal degradation was highly likely due to the fomation of fiber-metal-dye chelated complex by alum or iron mordanting before dyeing.
GC-MS Analysis of Dyes Extracted from Turmeric
Ahn Cheun-Soon,Obendorf S. Kay The Korean Fiber Society 2006 Fibers and polymers Vol.7 No.2
Standard extraction procedure for examining chromophoric substances of turmeric was investigated. Acetone and methanol were used as extracting solvents with different extraction procedures and pH levels. GC-MS analysis identified curcumene 2 (6.7 min), feruloylmethane 3 (8.3 min), coumaran 4 (6.09 min), vanillin 5 (6.2 min), and zingiberene 6 (10.5 min) as the major products. Curcumin 1 which has been known as the major chromophoric substance of turmeric was not detected in any samples. The maximum amount of curcumene 2, which was used as the fingerprint product for turmeric dye, was obtained by utilizing presoaking and decanting step with methanol prior to actual extraction step using a waterbath shaker (WMM). The highest relative abundance of curcumene 2 was detected in pH 6 sample followed by pH 5 indicating that the most appropriate pH level was in the range of pH 6-5.
GC-MS Analysis of Curcumin Dye after Selective Degradation Treatment
Ahn, Cheun-Soon,Obendorf, S. Kay The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.3
Curcumin dye in methanol solution was treated in $100^{\circ}C$ oven (OV) and $H_2O_2/UV/O_2$(PER) conditions and thy degradation products were examined using gas chromatography mass spectrometry (GC-MS). Curcumin itself was not detected from either the OV or PER degraded samples. From OV degradation samples curcumene 1, o-coumaric acid 2, vanillin 3, 2,4-di-tert-butylphenol 4, benzene, 1-(3-cyclopentylpropyl)-2,4-dimethyl-4 5, 1-(4-hydroxy-benzylidene) acetone 6, feruloylmethane 7, and 2-propenoic acid, 3-[4-(acetyloxy)-3-methoxy phenyl]-, methyl ester 8 were detected. From PER degraded samples new products benzoic acid 9 and vanillic acid 10 were detected additionally. Under the same GC-MS instrumental condition, it is possible that the burial degraded curcumin dye or curcumin dyed textile will exhibit area peaks around $6.2{\sim}6.5\;min$ and $8.3{\sim}8.4\;min$ retention times, which have the mass spectrum matching closely with products 3, 4, 7, 8 or 9, 10.