14 research outputs found
Not Available
Not AvailableRefractance window (RW) drying is an emerging thin layer drying method in which drying of
a food product takes place by heat transfer from hot water to a product through a plastic
film. This study was conducted to prepare sapota bar using a batch type RW system.
Response surface methodology (RSM) was used to optimize the process variables viz. water
temperature (WT) (84.3, 87, 91, 95, and 97.7 C), initial pulp thickness (PT) (3.3, 4, 5, 6, and
6.7mm) and pectin concentration (PC) (0.3, 1, 2, 3, and 3.7%). Drying time (DT), ascorbic acid
content (AA), color, hardness, cohesiveness, gumminess, and chewiness of the bar were considered
as dependent variables. WT played important role followed by PC and PT. Hardness,
cohesiveness, gumminess, and chewiness increased but DT, AA, and L value decreased with
increase in WT and PC. Increase in DT and AA and decrease in L value was observed with
increase in PT. Optimum conditions of sapota bar preparation were found at 91 C WT,
5mm PT, and 2% PC with a drying time of 146 min. The moisture content, AA, L value,
hardness, cohesiveness, gumminess, and chewiness were 16 ± 1 g H2O/100 g sample,
10.7mg/100 g, 25.7, 26.2 kgf, 0.21, 5.37 kgf, and 3.12 kgf, respectively. The study demonstrated
that the RW drying can be effectively applied for preparation of qualitysapota bar in
lesser duration than the conventional tray drying method.Refractance window (RW) drying is an emerging thin layer drying method in which drying of
a food product takes place by heat transfer from hot water to a product through a plastic
film. This study was conducted to prepare sapota bar using a batch type RW system.
Response surface methodology (RSM) was used to optimize the process variables viz. water
temperature (WT) (84.3, 87, 91, 95, and 97.7 C), initial pulp thickness (PT) (3.3, 4, 5, 6, and
6.7mm) and pectin concentration (PC) (0.3, 1, 2, 3, and 3.7%). Drying time (DT), ascorbic acid
content (AA), color, hardness, cohesiveness, gumminess, and chewiness of the bar were considered
as dependent variables. WT played important role followed by PC and PT. Hardness,
cohesiveness, gumminess, and chewiness increased but DT, AA, and L value decreased with
increase in WT and PC. Increase in DT and AA and decrease in L value was observed with
increase in PT. Optimum conditions of sapota bar preparation were found at 91 C WT,
5mm PT, and 2% PC with a drying time of 146 min. The moisture content, AA, L value,
hardness, cohesiveness, gumminess, and chewiness were 16 ± 1 g H2O/100 g sample,
10.7mg/100 g, 25.7, 26.2 kgf, 0.21, 5.37 kgf, and 3.12 kgf, respectively. The study demonstrated
that the RW drying can be effectively applied for preparation of qualitysapota bar in
lesser duration than the conventional tray drying method.Not Availabl