Optimization of Ultrasound-assisted Anthocyanin Extraction from Black Rice Bran for Simultaneous Coloring, UV Protection, and Antioxidant Silk Finishes

Benjamas  Klaykruayat; Nattaya  Vuthiganond; Pisutsaran Chitichotpanya

doi:10.59796/jcst.V15N1.2025.86

Authors

Benjamas Klaykruayat Division of Materials and Textile Technology, Faculty of Science and Technology, Thammasat University, 99 Phahonyothin Road, Klong Luang, Pathum Thani 12120, Thailand
Nattaya Vuthiganond Division of Materials and Textile Technology, Faculty of Science and Technology, Thammasat University, 99 Phahonyothin Road, Klong Luang, Pathum Thani 12120, Thailand
Pisutsaran Chitichotpanya Division of Materials and Textile Technology, Faculty of Science and Technology, Thammasat University, 99 Phahonyothin Road, Klong Luang, Pathum Thani 12120, Thailand

DOI:

https://doi.org/10.59796/jcst.V15N1.2025.86

Keywords:

black rice bran, silk, bioactive dye, antioxidant activity, UV-protection, ultrasound, response surface methodology

Abstract

This study examined the use of ultrasound to extract anthocyanin from agricultural byproduct black rice bran as a natural colorant and a multifunctional finishing agent for silk fabrics, taking into account the various health advantages linked to anthocyanins. The study employed response surface methodology to identify the optimal extraction process that would yield the highest extraction efficiency for total anthocyanin content. The optimal conditions were 30 Hz ultrasonic power, a liquor-to-material ratio of 21, 60°C an ultrasound temperature, and 30 minutes of an ultrasound time, yielding 173.25 mg/L anthocyanin. Silk fabrics were dyed in a reddish purple tone, and the mordant dyeing method produced a 34% higher color strength value than direct dyeing while displaying good colorfastness (grade ≥ 4) to washing and crocking. The dyed silks also provided excellent UV protection (UPF > 40+) and antioxidant activity, with a DPPH scavenging rate over 80%. Anthocyanins derived from black rice bran could thus be used as a bioactive functional colorant in medical and health-related textiles.

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