Study of interaction of hypericin and its pharmaceutical preparation by fluorescence techniques.
We report the detection of interactions between a photosensitizer, hypericin (HY), and its solvent system prepared with a formulation additive, polyvinylpyrrolidone (PVP), a commonly used pharmaceutical excipient. Fluorescence correlation spectroscopy (FCS) and fluorescence lifetime imaging microscopy (FLIM) were used to study aggregation and binding of HY in the presence of PVP. Digitized fluorescence endoscopic imaging (DFEI) was used to study the effect of the pharmaceutical formulation in the in vivo tumor implanted chick chorioallantoic membrane (CAM) model. The results presented reveal the coordination of HY-PVP binding, HY disaggregation in the presence of PVP, and strengthened HY tumor uptake selectivity. PVP is thus suggested as a potential adjuvant to previously investigated N-methyl pyrrolidone (NMP) in the HY delivery system as well as a replacement for the conventionally used albumin in the HY bladder instillation fluids preparation for clinical use.
Liu
Jun
J
National University of Singapore, Department of Chemistry, 3 Science Drive 3, Singapore 117543, Singapore.
Saw
Constance Lay Lay
CL
Olivo
Malini
M
Sudhaharan
Thankiah
T
Ahmed
Sohail
S
Heng
Paul Wan Sia
PW
Wohland
Thorsten
T
D000818:Animals; D000873:Anthracenes; D045744:Cell Line, Tumor; D002642:Chick Embryo; D004337:Drug Carriers / Q000737:chemistry*; D006801:Humans; D008856:Microscopy, Fluorescence / Q000379:methods*; D010569:Perylene / Q000031:analogs & derivatives* / Q000737:chemistry / Q000493:pharmacokinetics; D011205:Povidone / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*; D001749:Urinary Bladder Neoplasms / Q000378:metabolism*
D000873:Anthracenes; D004337:Drug Carriers; D010569:Perylene; C004965:hypericin; D011205:Povidone