Development of xylanase as detergent additive to improve laundry application

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Abstract

The development of kitchen waste from UNISEL’s cafeteria as a substrate in the production of xylanase is an alternative way of converting waste to wealth. The production of xylanase as a detergent or detergent additive capable of removing plant stains compared to limited detergent applications that are unable to remove plant stains. Aspergillus niger was used in this study to degrade hemicellulose in kitchen waste and to secrete xylanase by solid state fermentation (SSF). Optimization of SSF parameters including substrate moisture content, inoculum size and incubation temperature were determined to optimize xylanase production. The finding of maximum activity of xylanase was identified at 80% of the moisture content, 8.0 mL of inoculum size and 30°C of the incubation temperature. The efficacy of xylanase (from optimized SSF parameters) as a plant stain remover is significantly effective compared to the commercial detergent used in this research. However, the mixture of detergent and xylanase can cause the chemical content of the detergent to interfere with the action of the enzyme and its efficacy in the removal of plant stains is less effective. It is also easier to use xylanase with water due to it is capable of producing excellent performance. This study demonstrated the high efficiency of the washing process using xylanase from kitchen waste and can be suggested for the laundry industry.

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Using both xylanase and laccase enzymes for pulp bleaching.

Cristina Valls, M. Blanca Roncero (2009)

Two enzyme treatments involving xylanase (X) and laccase (L) were used jointly in an XLE sequence (where E denotes alkaline extraction) to bleach oxygen-delignified eucalyptus kraft pulp in the presence of 1-hydroxybenzotriazol (HBT) as mediator. The results of the XLE sequence were compared with those of an LE sequence. The application conditions for the laccase-mediator system were optimized by using a sequential statistical plan involving three variables (viz., the laccase and mediator doses, and the reaction time) with both sequences. The models used to predict the kappa number and brightness revealed that, once all accessible lignin was removed, the system altered other coloured compounds. The best conditions for the L stage involved a reduced mediator dose (0.5% odp). The xylanase pretreatment increased the accessibility of residual lignin and facilitated removal of hexenuronic acids. For a specific target brightness level of 70% ISO, the X pretreatment can save as much as 30% laccase and 80% mediator while shortening the reaction time by 45%.