Optimization of Process Parameters in Spray Drying of Cashew Apple Juice

摘要

The present investigation tries to optimize different carriers in varying proportions and inlet temperature for spray drying of clarified cashew apple juice, juice mixed with Maltodextrin (M) or Resistant dextrin (D) in varying proportions basedon juice solid and carrier ratios as 70:30 (CJ, 60:40 (C2), 50:50(CJ, 40:60 (CJ was fed to co-current spray drier by a peristaltic pump for drying at six different inlet temperatures as 150°C (TJ, 160°C (T2) 170°C (TJ, 180°C (TJ, 190°C (T_), 200°C (TJ. Feedrate was varied so as to maintain the outlet temperature at 88 ±2 °C at 4 bar atomization pressure and 2000 RPM blower capacity. Increment of50°C, 40"C and 20°C from the lowest inlet temperature led to 153 per cent, 98 per cent and 45 per cent higher feed rate respectively. Higher concentration of maltodextrin par with subsequent lower concentration of resistant dextrin in recovery of powder at cyclone. Resistant dextrin, higher concentration of carrier and lower inlet temperature had marked effect in translocating more powder to cyclone. The variation in process parameters had higher influence in the cyclone recovery than powder from chamber. The optimized parameters were resistant dextrin in carrier types, juice solid and carrier ratio of40:60in concentration and 160°C inlet temperature which yielded 72.1 per cent of the total solids of the feed as powder with 40.56 per cent powder recovery in cyclone.