| dc.description.abstract | The increasing interest in the use of natural dyes is not accompanied by
sufficient information and method for the application due to broad natural dyes
resources existence. Gambir (Uncaria gambir), one of promising favorable natural
dyes, has been used as batik coloring for decades. However, the application of gambir
extract as a textile colorant faces a severe problem to be encountered which is the
microbial growth such as fungi, mold, and bacteria. This study proposed several
antifungal agents to suppress the growth of the fungus such as chitosan, aloe vera,
and formaldehyde. To conduct the fungus inhibition concentration of every antifungal
agent, Aspergillus niger was introduced on the colored cloth medium with the addition
of Potato Dextrose Broth (PDB) growth media. Three methods of antifungal addition
during the coloring process were investigated namely pre-coloring, post-coloring, and
mix coloring process. The growth of Aspergillus niger was observed and measured the
diameter and thickness of the colony. One-way ANOVA was used to analyze the
treatment significantly. The result showed that all concentration of chitosan and
formaldehyde addition, significantly, could suppress the fungus growth. However,
formaldehyde is a toxic ingredient and harmful to the environment which becomes a
limitation in the application. Meanwhile, from the significance level, Aloe vera could not
inhibit the Aspergillus niger growth with the addition of 2 and 5 g/L, but it could
suppress the Aspergillus niger growth with the addition of 8 g/L. Furthermore, the
optimum condition was observed on the addition of 5 g/L chitosan at post-coloring
method because of the minimum growth area of the Aspergillus niger | en_US |
