[HTML][HTML] Surfactant-stripped frozen pheophytin micelles for multimodal gut imaging

Y Zhang, D Wang, S Goel, B Sun… - … (Deerfield Beach, Fla …, 2016 - ncbi.nlm.nih.gov
Y Zhang, D Wang, S Goel, B Sun, U Chitgupi, J Geng, H Sun, TE Barnhart, W Cai, J Xia
Advanced materials (Deerfield Beach, Fla.), 2016ncbi.nlm.nih.gov
A gut imaging contrast agent would benefit from the following: 1) being edible and generally
regarded as safe; 2) transiting stably through the intestine; and 3) activity in multiple
modalities. We found that Chlorophyll-a (Chl), a plant pigment that is ubiquitous in human
diets, was amenable to formulation in surfactant-stripped induced frozen micelles (ss-
InFroMs). However, Chl ss-InFroM stability was limited in gastric conditions in vitro and in
vivo. By demetallating Chl to generate pheophytin-a (Pheo), more stable ss-InFroms were …
Abstract
A gut imaging contrast agent would benefit from the following: 1) being edible and generally regarded as safe; 2) transiting stably through the intestine; and 3) activity in multiple modalities. We found that Chlorophyll-a (Chl), a plant pigment that is ubiquitous in human diets, was amenable to formulation in surfactant-stripped induced frozen micelles (ss-InFroMs). However, Chl ss-InFroM stability was limited in gastric conditions in vitro and in vivo. By demetallating Chl to generate pheophytin-a (Pheo), more stable ss-InFroms were obtained which exhibited complete fecal excretion following oral gavage without systemic absorption. Because ss-InFroms could be concentrated to high concentration during the low-temperature stripping of the loose Pluronic surfactant, Pheo ss-InFroMs were used for non-invasive photoacoustic computed tomography of the gut of mice. Unexpectedly, Pheo (but not Chl) ss-InFroms exhibited strong near infrared fluorescence, further enabling non-invasive fluorescence gut imaging. Since Pheo (but not Chl) could be chelated with exogenous metals, Pheo ss-InFroMs could be seamlessly post-labeled with 64 Cu for whole body positron emission tomography. Taken together, these results underscore the potential for Pheo, as an edible material, to be re-formulated for higher-order multimodal gut imaging.
ncbi.nlm.nih.gov
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