Assessment of Hibiscus rosa-sinensis and Delonix regia Flower Extracts on the Quality Parameter of Buffalo Milk Paneer

Abstract

The present study was undertaken to evaluate the effect of Hibiscus rosa-sinensis and Delonix regia flower extracts on the quality and storage stability of buffalo milk paneer under refrigeration (4±1°C). Aqueous extracts of both flowers were incorporated individually and in combination into buffalo milk prior to coagulation. Physico-chemical, microbiological, and sensory attributes of treated paneer samples were assessed at regular intervals during storage. Paneer treated with combined extracts (T4) showed the highest total phenolic content and lowest TBARS values, indicating higher antioxidant activity. During storage, decrease in pH and increase in titratable acidity was noticed in all treatments. Microbial growth (SPC, psychrophilic, yeast & mould, and coliform counts) increased with progress of storage but remained within limits prescribed by FSSAI for a longer duration in treated samples than in control. Sensory scores for colour, flavour, texture, juiciness, and overall acceptability were significantly higher in the T4 group. The synergistic effect of both flower extracts effectively retarded lipid oxidation and microbial spoilage, extending the shelf life of paneer up to 15 days under refrigeration. The findings support the potential of natural flower extracts as promising natural preservatives for enhancing the quality and safety of dairy products.