The release of D3 in simulated intestinal fluid (SIF) was investigated
using a USP-2 paddle apparatus (SOTAX Corporation, Westborough,
MA, USA). The release media consisted of SIF in the
presence and absence of 1.0% pancreatin (w/v) at pH 6.8 prepared
as described in the US Pharmacopoeia. Each of the solutions containing
either D3 (100 ml) or the D3-loaded blg/Lyso microspheres
was incubated in SIF with or without pancreatin under continuous
agitation (at 50 rpm) at 37 C (Diarrassouba et al., 2015). Samples
were withdrawn at regular intervals over 6 h, centrifuged
(5000g/5 min) and the concentration of D3 in the supernatant
was determined. A control with and without enzyme was also run.