Using Saccharomyces cerevisiae Strains as Biocatalyst for Indigo Reduction

신윤숙,손경희,유동일 한국섬유공학회 2019 Fibers and polymers Vol.20 No.1

The aim of this study is to investigate the efficacy of S. (Saccharomyces) cerevisiae strains to reduce natural indigo and to develop an eco-friendly reduction process of indigo as an alternative of chemical reductant. S. cerevisiae strains from baker’s yeast powder and Korean rice wine respectively were cultured, and used for carrying out the reduction of indigo. The reducing-activity toward natural indigo was evaluated quantitatively by dyeing test to measure color strength (K/S value) onto ramie fabric. The changes in K/S value and pH were monitored on the time-based mesurements. The time required to start reduction and maximum reduction, and duration were also evaluated. The time to reach the highest reduction level, i.e., the highest K/S value, of strain I (2-3 days) was shorter than that of strain II (3-4 days). The strain I from baker’s yeast showed higher reducing-activity, resulting stronger color yield on the fabric, and longer duration period than the strain II from Korean rice wine. Initial pH decreased drastically from 11.2 to 7-9 for one week with the progress of reduction reaction. K/S value increased to maximum (12-13) at first 2-4 days and decreased rapidly to 6-8, and then maintained for more than one week. Among reaction variables, controlling pH was the most critical to get maximum color strength when we used S. cerevisiae as biocatalyst.

면섬유에 대한 홍차색소의 염색성

신윤숙,서명희 한국의류학회 2000 한국의류학회지 Vol.24 No.1

The colorants from black tea infusion were applied to cotton fabric. Dyeing properties were investigated in terms of dye uptakes at various dyeing conditions and the effect of mordants on color change and colorfastness. Cotton showed low affinity to black tea colorants. Effect of mordants on dye uptake was not significant except Sn. Irrespective of mordant type, color of cotton dyed with black tea colorants was brownish and colorfastness was generally good. In order to improve dye uptake, cotton was cationized by treating with Cationon UKt (tertiary ammonium salt) and chitosan. Dye uptake of cotton was remarkably increased by cationizing. Cationon UK was more effective than chitosan.

카이토산을 이용한 DP 면직물의 염색성 향상(I)

신윤숙,류동일 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.5

Cotton fabric was treated with the mixture of chitosan and DMDHEU in one step process. Effect of chitosan on dye uptake was investigated. Colorfastness to laundering and rubbing was evaluated. Performance properties including wrinkle resistance, breaking strength, and stiffness were also measured. The treated samples had an acceptable level of wrinkle resistance, yet were dyeable with direct and acid dyes. At the higher molecular weight of chitosan, the higher direct and acid dye uptakes were obtained. Reactive dye uptake under acid condition was increased appreciably compared with that under alkaline condition.

카이토산을 이용한 이지케어 면직물의 방어성 증진(I)

신윤숙,이언홈 한국섬유공학회 1994 한국섬유공학회지 Vol.31 No.8

The applicability of chitosan to improve the soil release property of DP finished cotton fabric was investigated. Fabric was treated with a mixture of chitosan. DMDHEU, catalyst and other additives in a single step. Chitosan was used after depolymerizing into five different average molecular weight products from 185, 300 to 3, 800. All the samples treated with DMDHEU/chitosan showed higher soil removal than those treated with DMDHEU. For all the washing temperatures studied, the highest levels of soil removal were exhibited by the samples treated with chitosan of average molecular weight below 21, 00. The improvement of soil removal was attributed to the prevention of deep soiling and the increase in gydrophilicity by the chitosan treatment.

면직물의 성능개선을 위한 중합 및 가교화반응(I) -개선된 가공처리공정-

신윤숙,Kwa 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.2

The new and improved procedures were investigated to achieve superior balance of strength and durable press(DP) performance. The resin mixture of a polymer builder(NMA) and a crosslinker(DMDHEU) was used with the WF and SF processes, and the treated fabrics were compared with those from the conventional PDC(DMDHEU) process. With the WF process, a 2.7:1 resin mixture ratio gave improved tear strength retention by 80%, abrasion resistance retention by 200%, as compared to the conventional PDC(DMDHEU) process. With the SF process, 1:1.3 mixture ratio produced fabrics with softer hand and higher strengths and abrasion resistance retentions than those of treated with the WF process.

Eco-friendly indigo reduction using bokbunja (Rubus coreanus Miq.) sludge

신윤숙,최민,유동일 한국의류학회 2014 Fashion and Textiles Vol.1 No.1

The utilization of Bokbunja (Rubus coreanus) sludge as a source of reductant was investigated to develop an eco-friendly indigo dyeing process. Total sugar contents were 18.94 and 50.87% for ethanol and water extracts, respectively. The extract was effective to reduce indigo dye. Reduction of indigo was occured rapidly in the solution containing the extract and indigo dye in alkaline condition and it reached to the maximum color yield in one or two day. The reduction potential of the extract was stabilized between -550 mV and -600 mV depending on concentration of the extract. At higher concentration of the extract, reduction power was maintained stably for longer time and stronger color yield. It was confirmed that the Bokbunja sludge extract can be an eco-friendly and safe alternative to sodium dithionite as a reducing agent in indigo dyeing processes.

DP면직물의 강도보유 향상에 대한 메카니즘(I) -형태학적 변화 및 마모현상-

신윤숙 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.1

DP finished cotton fabrics treated by conventional and non-conventional processes to obtain superior balance of performance properties were compared in terms of resin location, morphological changes, and abrasion fracture pattern. It was confirmed that development of polymeric crosslinks and more uniform distribution were important factors. And it was found that tight monomeric crosslink formed by the conventional process increased binding action and making fibrillation difficult during flex-abrading, and resulting decrease in flex abrasion resistance.

석류색소에 대한 견섬유의 염색성

신윤숙,조은경 한국의류학회 2001 한국의류학회지 Vol.25 No.2

Dyeing properties of the colorants extracted from pomegranate hull on silk fabric were investigated. Pomegranate colorants were characterized by FT-IR analysis. Effects of dyeing condition and mordanting on dye uptake, color change and colorfastness were explored. Pomegranate colorants showed high affinity to silk fiber and its isotherm adsorption curve was Langmuir type. Therefore, ionic bond was involved in the adsorption of pomegranate colorants on to silk fiber. Mordants except Fe did not significantly increase dye adsorption. Pomegranate colorants produced mainly yellow color on silk fabric, but the silk mordanted with Fe showed yellow red color. Fastness to washing, perspiration, and rubbing was not improved by mordanting treatment, but light colorfastness was increased by Fe mordant.

면직물의 DP가공에 따른 역학적 성질의 변화

신윤숙,김승진,최희,Shin, Youn-Sook,Kim, Seung-Jin,Choi, Heui 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.10

Crosslinking reaction between DMDHEU and hydroxyl group of cellulose on cotton and polyester/cotton fabrics was carried out by the pad4ry-cure(PDC) method in the presence of acidic catalyst. Finished samples were evaluated for durable press(DP) and performance properties. Such analysis was done to investigate distribution of resin. Mechanical properties of fabrics were measured by the KES-FB System and the hand values were calculated from the data of mechanical properties. Effects of add-on(%) on the mechanical properties and the hand were compared. With the increase of add-on, DP rating and WRA increased until they reached over definite concentration and then decreased. Tear strength decreased and stiffiness increased. As add-on increased tensile properties, LT, n, and RT increased. Bending properties, B and 2HB, exhibited the tendency to increase and particularly in the P/C(65/35) blend fabrics, 2HB showed an increase to a great extent. The shearing properties, 6, 2HG, and 2HGS, increased and compression properties, LC, WC, and RC decreased. The surface properties, MIU, MMD and SUD, decreased. With the increase of add-on, stiwness, nispness and anti-drape stiwness increased and fullness & softness decreased.

혼합촉매를 이용한 면직물의 듀어러블 프레스 가공

신윤숙,손경희 한국섬유공학회 1994 한국섬유공학회지 Vol.31 No.6

Crosslinking reaction was carried out between DMDHEU antral cellulose by using pad-dry-cure(PDC)method in the presence of mixed catalysts such as aluminum sulfate/glycolic acid, aluminum sulfate/tartaric acid, antral aluminum sulfate/citric acid. Effects of catalyst system and total concentration, mixture ratio of catalyst, and curing condition were investigated. And also durability test to home laundering, SEM analysis, moisture regain measurement, and FT-lR spectroscopic analysis were done. Optimum finishing conditions obtained were 16$0^{\circ}C$/2.5~3 minutes curing and 2.5% aluminum sulfate/0.5% acid of mixture ratio for all three mixed catalyst systems. The fabric samples treated with miked catalysts at optimum conditions showed better balance of Dp/performance properties than those of treated by conventional single catalyst. Regardless of catalyst systems, durability to home laundering of treated samples showed similar results. SEM analysis showed no big difference in resin distribution and penetration level between catalysts. And moisture regain was decreased after crosslinking reaction and showed the decrease as catalyst concentration was increased. Mixed catalysts imparted bettor balance of Dp/performance properties and this synergistic effect seemed to attribute to the complex formation.