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, 55 (12), 5003-5013

Effect of Extrusion Conditions on the Physicochemical and Phytochemical Properties of Red Rice and Passion Fruit Powder Based Extrudates

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Effect of Extrusion Conditions on the Physicochemical and Phytochemical Properties of Red Rice and Passion Fruit Powder Based Extrudates

Duyi Samyor et al. J Food Sci Technol.

Abstract

The passion fruit powder blended rice flour based extrudate was developed and investigated in terms of physicochemical and phytochemical properties. The extrusion process was performed using a twin screw extruder and optimized using rotatable central composite design followed by response surface methodology. The effect of process parameters such as temperature (80-150 °C), screw speed (200-400 rpm), moisture content (20-30%) and passion fruit powder (0-15%) on product quality was investigated. The optimum extrusion conditions of temperature, screw speed, feed moisture content, and passion fruit powder were 97.50 °C, 250 rpm, 25.20% and 11.25%, respectively. At optimum condition, the predicted values of responses were expansion ratio 8.05, water absorption index 2.77, total phenolic content 129.492 mg GAE/100 g and DPPH scavenging activity 65.79%. A comparison between optimized and control extrudates revealed that thermal, crystallinity and morphological properties of extrudates differed significantly. The comparison was also conducted in terms of FT-IR, SEM-EDS and HPLC analysis. The phytochemical properties showed that β-carotene, cyanidin-3-glucoside, peonidin-3-D-glucoside chloride were higher in control whereas the optimized sample evinced more (±)-α-tocopherol and D-α-tocopherol.

Keywords: Extrusion; Morphology; Phytochemical; Purple passion fruit; Red rice.

Figures

Fig. 1
Fig. 1
Response surface graphs for effect of screw speed (rpm), temperature (°C) and moisture content (%) on (a, b) expansion ratio (%); (c, d) water absorption index (%); (e, f) total phenolic content (mg/100 g); (g, h) 2, 2′-diphenyl-1-picrylhydrazyl (%)
Fig. 2
Fig. 2
FTIR graph of control and optimized extrudates
Fig. 3
Fig. 3
SEM of control (a, b, and c) and optimized (d, e, f) samples at 100, 2500, and 10000X

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