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All Journal Molekul: Jurnal Ilmiah Kimia
Mercy Irda Riantiny Taroreh
Department of Food and Science Technology, Faculty of Agriculture, Sam Ratulangi University, Manado, Indonesia
Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology

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Characterization of Sago Starch Complex with Ferulic Acid Isolated from Corn Cob and Evaluation of Antioxidant Activity Edi Suryanto; Mercy Irda Riantiny Taroreh; Alexander Sam Leonard Bolang; Imam Jayanto
Molekul Vol 21 No 2 (2026)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2026.21.2.18316

Abstract

ABSTRACT. Corncob is one of agro-food by-products, a potential source of natural antioxidants and functional food ingredients, rich in ferulic acid and dietary fibre. In this study, ferulic acid was isolated from corncobs after alkaline pretreatment using a multi-step extraction process and structurally verified, providing a suitable bioactive compound for baruk sago (SB) starch complexation. FTIR analysis showed characteristic absorption peaks at 3379-3387 cm⁻¹, indicating interactions between FA and starch. XRD results revealed a transformation of the native SB starch crystalline structure and a marked decrease in crystallinity from 40.31% to 8.60% after complexation. SEM observations demonstrated morphological changes from predominantly smooth, oval, and compact granules to a looser gel structure in the starch–FA complex. In vitro antioxidant evaluation using the DPPH radical scavenging assay showed that the SB starch–FA complex exhibited higher scavenging activity compared to native SB and pre-gelatinized (SBG) starch. These findings confirm the successful incorporation of FA into SB starch and demonstrate that complexation significantly modifies physicochemical properties and enhances antioxidant capacity, highlighting its potential application as a functional food ingredient and nutraceutical material. Keywords: Antioxidant, characterization, sagu baruk, starch-ferulic acid complex
Co-Authors Alexander Sam Leonard Bolang Edi Suryanto Imam Jayanto