Results and discussion
Powder recovery
Figure 1 shows the visual observation of
coconut sweet toddy powder.
The recovery of spray-dried treacle powder was
determined (Figure 2). A zero powder recovery was
observed in the case of formulation of treacle:
drying aid: water in the ratio of 40:10:50 since all
sugar solids in the formulation were lost as wall
deposits. This indicates that 10% of drying aid was
not sufficient to overcome stickiness. It is reported
that wall deposition is a common occurrence in
spray-drying and accounts for the major loss of
product (Masters, 1991). Maltodextrin (DE-10)
used in this research was to improve the yield of
product by reducing surface stickiness of low
molecular weight sugar and thus reduce wall
deposition. When the drying aid percentage was
increased from 10% to 15% and 20% the total
recoveries rose to 60.2±2.90% and 57.8±3.5%,
respectively. It is reported that the benchmark
cyclone recovery for a marginally successful spraydrying
process of sugar-rich material is more than
50% (Bhandari et al., 1997a; Bhandari et al.,
1997b). Therefore, spray-drying of coconut treacle
with both 15% and 20% maltodextrin (DE-10)
separately yielded a higher amount of powder
recovery compared to the bench mark recovery
value. Since there was no significant difference
(P>0.05) between the recoveries of treacle: drying
aid: water in the ratio of 30:20:50 and 35:15:50, the
formulation with the lower percentage of drying aid
(15%) was selected for further analysis.
Results and discussionPowder recoveryFigure 1 shows the visual observation ofcoconut sweet toddy powder.The recovery of spray-dried treacle powder wasdetermined (Figure 2). A zero powder recovery wasobserved in the case of formulation of treacle:drying aid: water in the ratio of 40:10:50 since allsugar solids in the formulation were lost as walldeposits. This indicates that 10% of drying aid wasnot sufficient to overcome stickiness. It is reportedthat wall deposition is a common occurrence inspray-drying and accounts for the major loss ofproduct (Masters, 1991). Maltodextrin (DE-10)used in this research was to improve the yield ofproduct by reducing surface stickiness of lowmolecular weight sugar and thus reduce walldeposition. When the drying aid percentage wasincreased from 10% to 15% and 20% the totalrecoveries rose to 60.2±2.90% and 57.8±3.5%,respectively. It is reported that the benchmarkcyclone recovery for a marginally successful spraydryingprocess of sugar-rich material is more than50% (Bhandari et al., 1997a; Bhandari et al.,1997b). Therefore, spray-drying of coconut treaclewith both 15% and 20% maltodextrin (DE-10)separately yielded a higher amount of powderrecovery compared to the bench mark recoveryvalue. Since there was no significant difference(P>0.05) between the recoveries of treacle: dryingaid: water in the ratio of 30:20:50 and 35:15:50, theformulation with the lower percentage of drying aid(15%) was selected for further analysis.
การแปล กรุณารอสักครู่..
