Spray-Air Contact in Tall and Short-Type Spray Dryers Affects Important Physicochemical Properties of Microencapsulated Chia Seed Oil

Abstract

The aim of this work was to determine the influence of the spray dryer’s aspect ratio (height/diameter) on the physico-chemical properties of microencapsulated chia oil (CSO). Two different dryers were analyzed: a tall-type dryer [H/D = 5/1], and a short-type dryer [H/D = 1.65/1]. The former corresponded to a co-current flow, while the latter had a central air disperser in the chamber, and a rotary air flow. Emulsions were prepared by homogenization of CSO, and a mixture of soy protein isolate (SPI) and gum arabic (GA). The co-current contact in the tall-type dryer yielded greater oxidative stability indexes (OSI) (three times higher than CSO), which was possibly associated the reduced thermal degradation. It can be concluded that a co-current contact constitutes a better alternative for the protection of CSO.

Spray drying and nano spray drying as manufacturing methods of drug-loaded polymeric particles

“…Two types of drying chambers of different height-to-diameter ratio (5:1 for tall and 2:1 for small chambers) are used. 18,22 Since the drying time is longer in large chambers than in small chambers, the former are recommended for aqueous fluids. 1,23 To separate dry solid particles from the air stream, centrifugal separators in the form of cyclone units are commonly used.…”