Black glutinous rice (BGR) was milled and the bran was collected for anthocyanins extraction. The broken
rice fraction was enzymatically produced as black glutinous rice maltodextrins (BRM) with 3 dextrose
equivalents (DE), including DE10 (BRM10), 20 (BRM20) and 30 (BRM30). The BRMs were used as wall
materials in microencapsulation processes. Feed mixtures were spray dried at 3 inlet air temperatures
(140, 160 and 180 C) and freeze dried at 45 C. Process yield, anthocyanin retention, and powder
properties were investigated. The results demonstrated that increasing the inlet air temperature caused a
decrease in the bulk density and anthocyanin retention. Moreover, increasing the inlet air temperature
enhanced dehydration, process yield, solubility, dispersibility, flowability and smooth particle surface.
The suggested conditions for the spray drying process were 180 C of inlet air temperature combined
with BRM20, and the suggested wall material for the freeze drying process was also BRM20. A comparison
between the BRMs and a commercial maltodextrin (DE10) showed that microencapsulation of
anthocyanin using BRM20 had a higher process yield while the other powder properties were similar.
The results suggest that BRM can be applied to replace commercial maltodextrin for anthocyanin
microencapsulation.
Black glutinous rice (BGR) was milled and the bran was collected for anthocyanins extraction. The brokenrice fraction was enzymatically produced as black glutinous rice maltodextrins (BRM) with 3 dextroseequivalents (DE), including DE10 (BRM10), 20 (BRM20) and 30 (BRM30). The BRMs were used as wallmaterials in microencapsulation processes. Feed mixtures were spray dried at 3 inlet air temperatures(140, 160 and 180 C) and freeze dried at 45 C. Process yield, anthocyanin retention, and powderproperties were investigated. The results demonstrated that increasing the inlet air temperature caused adecrease in the bulk density and anthocyanin retention. Moreover, increasing the inlet air temperatureenhanced dehydration, process yield, solubility, dispersibility, flowability and smooth particle surface.The suggested conditions for the spray drying process were 180 C of inlet air temperature combinedwith BRM20, and the suggested wall material for the freeze drying process was also BRM20. A comparisonbetween the BRMs and a commercial maltodextrin (DE10) showed that microencapsulation ofanthocyanin using BRM20 had a higher process yield while the other powder properties were similar.The results suggest that BRM can be applied to replace commercial maltodextrin for anthocyaninmicroencapsulation.
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