Journal
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
Volume 170, Issue -, Pages 22-29Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpba.2019.03.026
Keywords
Colloids; Micelles; Field-flow fractionation; Light scattering; Gastrointestinal; Human bile; Bile salts
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Funding
- ARIADME, a European FP7 ITN Community's Seventh Framework Programme [607517]
- COST (European Cooperation in Science and Technology) [16205 UNGAP]
- Nordic POP
- Nordic University Hub - NordForsk [85352]
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We investigated the ultrastructural pattern of colloidal phases in human duodenal fluids. Aspirates were collected from three volunteers in both fasted and fed nutritional states. Analysis methods comprised the combination of asymmetric flow field-flow fractionation (AF4) and multi-angle laser light scattering (MALLS). Furthermore, dynamic light scattering (DLS) and diffusion-ordered NMR spectroscopy (DOSY-NMR) were employed as alternative analytical approaches for comparison. By AF4/MALLS, up to four, and in some cases up to five distinct co-existing fractions could be differentiated in the sub-micron size-range, which, in accordance with a previous study (Elvang et al., 2018), may be assigned to three main types, namely small bile salt micelles, intermediate size mixed bile salt/phospholipid micelles and large phospholipid aggregates / vesicles. Although more or less the same colloidal phases were found to co-exist in all aspirates, their prevalence was found to vary, both over time and between the three individual human volunteers. Any uniform changes of patterns of colloidal phases over time, however, could not be identified. On the other hand, prevalence of specific colloidal phases was identified for aspirates of individual volunteers, which correlated reasonably well with the prevalence of certain lipid species in their molecular composition. It remains to be investigated whether such prevalence of specific colloidal phases influences drug solubilizing capacity as well as drug absorption. If so, this may help to better understand the substantial inter-individual variability seen in many drug absorption profiles. (C) 2019 Elsevier B.V. All rights reserved.
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