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All Journal KOVALEN: Jurnal Riset Kimia
Aulia Pariusi Pariusi
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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Formulation of Encapsulated Extracts from Local Palu Red Onion Bulbs (Allium cepa var. aggregatum L.) Using Carrageenan Coating: Characterization, Stability, and Antioxidant Activity Nurhaeni; Aulia Pariusi Pariusi; Aini Auliana Amar; Ruslan; Abdul Rahman Razak; Indriani
KOVALEN: Jurnal Riset Kimia Vol. 12 No. 2 (2026): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2026.v12.i2.18156

Abstract

This study aimed to identify the optimal concentration of carrageenan as a coating matrix for extracts of local Palu red onion bulbs (Allium cepa var. aggregatum L.) using the ion gelation method to characterise their properties, stability and antioxidant activity. The technique of converting liquid samples into small particles is known as microencapsulation. Carrageenan was formulated at varying concentrations (0.1%, 0.2%, 0.3%) with the addition of 0.1% Na-TPP. Testing of antioxidant activity at a concentration of 0.3% yielded the highest antioxidant activity of 87.59%. The ANOVA test results showed that the matrix concentration had a significant effect (<0.05) on antioxidant activity. A total phenolic content of 49.61 mg GAE/g was observed in the 0.3% carrageenan sample. Carrageenan was stable at temperatures of 25°C and 40°C. FTIR characterisation of the encapsulation process indicated the presence of spectra showing interactions between the coating matrix and the extract, revealing changes in functional groups. PSA analysis indicated a particle size of 2100 µm.
Co-Authors Abdul Rahman Razak Aini Auliana Amar Indriani Nurhaeni Ruslan