Comparison of Carriers in Anthocyanin Smart Packaging from Water Hyacinth Flower for Soy Milk Freshness

Abstract

Dairy products are highly susceptible to quality degradation caused by environmental conditions. The quality of soy milk is an important factor to consider before consumption. The extract of anthocyanins from water hyacinth flowers has the potential to be used as a natural indicator due to its good sensitivity to pH. The selection of the type of carrier used is also an important factor in the quality of the indicator label. This study used two types of carriers: starch and cellulose. The testing parameters included organoleptic tests, moisture absorption capacity, FTIR characterization, and indicator label testing over 48 hours. The test results showed that the indicator label was able to detect pH changes in soy milk. At pH 9 both starch and cellulose carriers showed significant color changes, especially at 40°C, with starch showing better visual intensity. In addition, FTIR test results showed absorption bands at 1416 cm-1 (C=C group) and 1646 cm-1 (C=O group) for the starch carrier demonstrating that the starch carrier has more intense absorption bands compared to cellulose. Therefore, starch carrier is more effective as a smart packaging indicator label compared to cellulose carrier.