Abstract
The production of powder from hibiscus extract with the possible addition of maltodextrin or fine citrus fibre has been investigated in a small-scale Buchi B-290 spray dryer to assess the drying yields and outlet moisture contents. The yields ranged from 24-58%, with inlet temperatures from 150oC to 210oC, solids concentrations in the extract of 11.4% and 25.9%, and the addition of 0.9-5.7% fine citrus fibre or 1% maltodextrin. At the same solids concentration, the inlet gas temperature was found to improve the yield. The drying behaviour appears to be kinetically limited. The inlet gas temperature has the most significant effect on the yield, with a 95% confidence level. For the outlet moisture contents, the effects of fibre, the amount of solids in the extract and the inlet gas temperature are all significant at confidence levels above 97.5%. Hence inlet conditions appeared to be more important than outlet ones, lending support to the suggestion that the performance of the equipment is more strongly influenced by the particulate drying kinetics.
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