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The Application of Catalase for the Elimination of Hydrogen Peroxide Residues After Bleaching of Cotton Fabrics

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The Application of Catalase for the Elimination of Hydrogen Peroxide Residues After Bleaching of Cotton Fabrics Anais da Academia Brasileira de Ciências (2002) 74(3): 433-436 (Annals of the Brazilian Academy of Sciences) ISSN 0001-3765 www.scielo.br/aabc The application of catalase for the elimination of hydrogen peroxide residues after bleaching of cotton fabrics ALEXANDRA M. AMORIM, MARCELO D. G. GASQUES, JÜRGEN ANDREAUS and MAURO SCHARF Department of Chemistry, Universidade Regional de Blumenau, 89010.971 - Blumenau- SC - Brazil Manuscript received on February 19, 2001; accepted for publication on April 27, 2002; presented by Fernando Galembeck ABSTRACT Results of dyeing of cotton fabrics with a bifunctional reactive dye were significantly improved when the fabric after bleaching with hydrogen peroxide was treated with catalase for the elimination of hydrogen peroxide residues from the fabrics. Compared to processes with a varying number of washing steps, with and without commercial reducing agents, the consumption of water could be significantly reduced, without altering the final color shade. Key words: catalase, peroxide bleaching, cotton fabrics, textile chemistry, reactive dye, dyeing. INTRODUCTION (Buschle-Diller et al. 1998), proteases for wool pro- cessing (Heine and Hocke 1995, Bishop et al. 1998), In the last years biotechnological processes are grad- and catalases for hydrogen peroxide removal is still ually invading traditional industries like the textile under investigation, but commercial products are al- industry. In some cases they are substituting tra- ready available (Pacheco 1998, Durán and Durán ditional processes, in other cases biotechnological 2000). products are used to produce new product proper- Reactive dyes of the (Monochlor- and Dich- ties. The principal advantages are associated to less lor-) triazinyl or vinylsulfone type are substantive to severe reaction conditions, lower processing tem- cellulosic fibers under neutral conditions but react peratures and non-toxic and biodegradable products. under alkaline conditions with the hydroxyl groups Due to their nature, enzymes increase selectively and forming covalent bonds. Depending on their reac- significantly the reaction rate of a series of specific tivity they react to a certain extent with water. Dye reactions (Vitolo and Filho 1995). hydrolysis is one of the main reasons for dye losses In today’s textile industry the removal of starch and problems with color differences in dyeing. Hy- sizes from cotton fabrics with amylases is a standard drolyzed dye molecules are still substantive to the procedure and cellulases are indispensable for the cellulose, but cannot form covalent bonds with the finishing of fabrics made from cellulosic fibers like fiber. They will be removed in posterior washing stone washing of denim garments or biopolishing steps and diminish color fastness (Trotman 1990). (Cavaco-Paulo 1998, Andreaus et al. 2000). The The bleaching with hydrogen peroxide is a fun- application of pectinases for biobleaching of cotton damental stage that precedes dyeing of cotton fab- Correspondence to: Mauro Scharf rics. Hydrogen peroxide as an oxidizing agent leads E-mail: [email protected] An Acad Bras Cienc (2002) 74 (3) 434 ALEXANDRA M. AMORIM et al. to degradation of reactive dyes (Uygur 1997, 2001) bleaching bath (0.5g/L Sidertex SQ69 as sequester- and may increase dye hydrolysis so that remain- ing agent, 0.5 g/L Sidertex DS205 as complexing ing peroxide residues on the fabric have a nega- and dispersing agent, 1.0 g/L Sidertex U35 as wet- tive influence on the result of dyeing (Tzanov et al. ting agent, 4 mL/L NaOH 50% and 5 mL/L H2O2 2001a). Thus residues from bleaching baths must be 50% (commercial)) at a liquor ratio = 1:15. The removed from fabric and machinery before adding bleaching bath was kept 5 minutes at 40◦C, heated the dye. Usually successive washes of the fabric up to 90◦C during 15 minutes and kept during 30 with water or chemical reducers diminish the resid- minutes at 90◦C. ual bleaching agent concentration and improve dye- After draining the bleaching bath, fabrics were ing. However, this involves the use of a big volume submitted to different treatments for the elimination of water, a longer process time or the use of chem- of peroxide residues from the fabric: ical products noxious to the environment, resulting 0-2 washes before dyeing in additional costs and the generation of more efflu- ents. An alternative to decrease the consumption of 0-2 washes + adding a commercial chemical water, energy and time is the use of catalases, which reducer to the dyeing bath catalyze the decomposition of hydrogen peroxide 0-2 washes + adding the catalase to the dyeing H O → H O + / O 2 2 2 1 2 2 bath and thus the elimination of its residues on cotton fab- The washing steps (0-2 times) before dyeing fabrics rics originated from the bleaching process (Schmidt were carried out with distilled water at a liquor ratio 1995). of 1:15. In a recent work Tzanov et al. (2001a) in- The commercial chemical reducing agent (0.8 vestigated the possibilities of dyeing with catalase- g/L, kindly supplied by Quimisa) and the catalase treated bleaching baths. Despite of the absence of (0.4 g/L; kindly supplied by Novo Nordisk) were peroxide in the catalase treated bleaching baths color added to the dye bath in the beginning of the dyeing differences to conventionally dyed fabrics were un- procedure. Fabrics were dyed with 1% o.w.f. (on acceptable. In continuation to their study (Tzanov et weight fabric) of the reactive dye Cibacrone Red FN- al. 2001b) they showed that results may be attributed R. The dye bath containing the dye, 0.5 g/L NaCl, to temperature-dependent dye-enzyme interactions and 6.0 g/L of a sequestering agent was heated up and to the complexity of the bleaching bath compo- within 10 minutes to 60◦ and held at that temperature sition. for 50 minutes. 30 g/L Na2CO3 were added after In the present work we studied the use of a 20 minutes to start the reaction between dye and catalase for the elimination of hydrogen peroxide cellulose. residues originating from the bleaching process of In a second set of experiments the influence cotton and its influence on dyeing with a bifunctional of enzyme concentration (0.4-0.6 g/L) temperature reactive dye of the monofluortriazinyl type. Results (25, 40 and 50◦C) and treatment time (10, 20 and are compared in terms of effectiveness and viability 40 minutes) was investigated. Bleaching, wash- with data obtained using chemical reducing agents ing and dyeing experiments were carried out in test and / or successive washes with water. tubes on a KIMAK dyeing machine. Color differ- ences and color intensity (K/S) of the dyed sam- MATERIALS AND METHODS ples were measured at 560 nm with an Optronik Pieces of knitted cotton fabrics (20 × 20 cm, 6.50 g) Reflectance Spectrophotometer (data measurement were bleached with hydrogen peroxide in a typical program Colormes Version: 5.3, model 1996). All An Acad Bras Cienc (2002) 74 (3) CATALASE FOR THE ELIMINATION OF PEROXIDE AFTER BLEACHING 435 experiments were executed in triplicate. Commer- tion of sodium carbonate) leads to deactivation and cial products were used without further purification. denaturing of the enzyme, there is not any need for its removal from the bath, which means that the en- RESULTS AND DISCUSSION zyme can be applied directly in the dyeing bath. Fabrics dyed without previous treatment af- The treatment with the enzyme catalase pre- ter bleaching for the elimination of the peroxide sented color yields similar to the treatments with residues presented low color yields and were used the chemical reducer and successive washes, with as a reference in the color measurements. All other the advantage of less water consumption and avoid- swatches are compared to these samples, so that high ing the use of noxious chemicals. The physical and color differences (E) mean a more intense color chemical properties of the final product did not show after dyeing. With successive washes or the use of any significant alterations due to the enzymatic treat- the catalase or the chemical reducer much better re- ment. Longer processing times and temperatures ◦ sults were obtained (Figure 1). When added directly around 50 C increased the efficiency of the enzy- to the dyeing bath without previous washing, the matic treatment, and improved the result of the same catalase and the chemical reducer showed to be effi- dyeing procedure. The maximum efficiency of the cient in the elimination of the peroxide residues and enzyme was reached at a concentration of 0.6 g/L of ◦ improved significantly the color yield. The intro- the enzyme solutions, 50 C and a reaction time of duction of one wash-step before the treatment with the enzyme of 40 minutes (Figure 2). the catalase or the chemical reducer and dyeing in- creased the color yield noticeable, whereas an ad- 2,40 ditional second wash-step just showed a slight im- 2,35 2,30 provement. 0,4g/L/25C 2,25 0,4g/L/50C 25 2,20 0,6g/L/50C 20 K/S at 5602,15 nm [-] without 2,10 E 15 reducing agent 10 20 30 40 10 catalase treatment time [min] 5 0 012 Fig. 2 – Color yield expressed in K/S in dependence on treatment washing steps time, temperature and catalase concentration. Fig. 1 – Color difference obtained by dyeing cotton knitted CONCLUSIONS fabrics with Cibacrone Red after different treatments following bleaching. The use of a commercial catalase for the elimination of hydrogen peroxide residues from cotton fabrics Results shown in Figure 1 demonstrate that improved considerably the dyeing behavior and the dyeing may be carried without any washing step color yield with a reactive bifunctional monofluortri- before dyeing by adding a catalase or a chemical azinyl dye.
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