Pengaruh konsentrasi biomordan kitosan pada proses pewarnaan kain katun dengan pewarna alami biji kesumba keeling (Bixa Orellana)

Rachma Tia Evitasari

doi:10.31941/cjbi.v3i2.906

Authors

Rachma Tia Evitasari Universitas Ahmad Dahlan

DOI:

https://doi.org/10.31941/cjbi.v3i2.906

Keywords:

Biomordant, Bixa orellana, Chitosan, Dyeing process, Natural dye

Abstract

The batik industry faces challenges due to the shift toward synthetic dyes, which negatively impact the environment. While natural dyes derived from Bixa orellana seeds are eco-friendly, they typically exhibit low color strength. This study aimed to enhance natural dye uptake by modifying the surface of cotton fabric using chitosan as a biomordant. Cotton fabrics underwent pre-mordanting with chitosan (at concentrations of 1, 1.5, and 2.5 g/L), followed by dyeing with Bixa orellana extract and fixation with alum. Color strength was analyzed using a spectrophotometer to determine K/S values. Dyeing with Bixa orellana seeds yielded colors ranging from yellow to orange; higher chitosan concentrations resulted in a deeper orange hue. The results showed an increase in color strength from 1.436 (without chitosan treatment) to 4.153 (at a concentration of 2.5 g/L), representing a 188% increase in color intensity. Ionic interactions and hydrogen bonding between the chitosan, fabric, and dye enhanced color affinity. Chitosan proved effective as a biomordant—with an optimal concentration of 2.5 g/L—thereby supporting a more sustainable natural dyeing process in batik production.

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