Discriminating against injectable fat emulsions with similar formulation based on water quenching fluorescent probe

Abstract

The discrimination against nutritional fat emulsion injections was considered by imaging tools, which aims to elucidate the in vivo behaviors of nanoemulsions. In this study, 20% nutritional fat emulsion injections were selected from different company including original and generic products. Meanwhile, a water quenching fluorescent probe (P2) was used to label them by an incubation method. The fluorescent intensity analysis of blood-borne fluorescence reveals rapid clearance of nanoemulsion in all groups, which shows ‘L’-type blood kinetic profiles. However, these kinetic parameters do not have significant difference. Following intravenous administration, the nanoemulsions in all groups concomitantly accumulated in organs of reticulo-endothelial system (RES), such as liver and spleen, and were cleared from body circulation mostly after 12 h. AUC(0-t) of organs from different groups showed dissimilar results in some organs. These intuitional results are of significance in understanding the in vivo behaviors of nanoemulsions, which can provide a new way to discriminate against nutritional fat emulsions.