Noer Octaviani Maliza, Muhammad Ikhsan Sulaiman, Dewi Yunita, Agus Arip Munawar, Rita Andini, Safrida
Jamblang (Syzygium cumini L.) vinegar is a potential functional fermented product that requires rapid and reliable quality assessment. This study developed a near-infrared spectroscopy (NIRS)-based method combined with partial least squares regression (PLSR) to quantify acetic acid content in jamblang vinegar. Vinegar samples representing a wide range of acetic acid concentrations were obtained through varied fermentation conditions and analyzed using a reference enzymatic method. NIR spectra were preprocessed using Multiplicative Scatter Correction (MSC) to reduce scattering effects caused by sample heterogeneity. PLSR models constructed from MSC-treated spectra showed improved predictive performance compared with uncorrected spectra, achieving a coefficient of determination (R2) of 0.995 and a residual predictive deviation greater than 2.3. Regression coefficient analysis identified wavelength regions associated with O-H and C-H overtone vibrations as key contributors to acetic acid prediction. The results demonstrate that NIRS coupled with MSC-enhanced PLSR provides a rapid, non-destructive, and accurate approach for acetic acid determination in jamblang vinegar, supporting its application for routine quality control and fermentation monitoring. © 2026 The Authors, published by EDP Sciences.
Department of Agricultural Product Technology, Universitas Teuku Umar, Aceh Barat, 23681, Indonesia; Department of Food and Agricultural Product Technology, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; Department of Agricultural Engineering, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; Research Organization for Environmental and Life Sciences, Research Centre for Applied Botany, National Agency for Research and Innovation, Cibinong, 16911, Indonesia; Department of Biology Education, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia; Halal Research Centre, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia
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