title: Stability behaviour of antiretroviral drugs and their combinations. 4: Characterization of degradation products of tenofovir alafenamide fumarate and comparison of its degradation and stability behaviour with tenofovir disoproxil fumarate.
abstract: In this study, stress degradation behaviour of tenofovir alafenamide fumarate (TAF), a novel prodrug of tenofovir, was investigated and compared with currently used prodrug congener, tenofovir disoproxil fumarate (TDF), whose intrinsic stability was reported by us earlier [14]. Also, pH stability and gastrointestinal stability studies were conducted on both the drugs. High performance liquid chromatography (HPLC) analysis of stressed samples of TAF revealed formation of six degradation products (DPs) against twelve characterized earlier in the case of TDF (RSC Adv. 5(2015) 96117-96129). Like TDF, characterization of DPs of TAF was done by using sophisticated hyphenated liquid chromatography-high resolution mass spectrometry (LC-HRMS) and multistage mass spectrometry (MSn) tools. pH-stability studies between pH 1.2-10 revealed greater stability of TAF, except in acidic conditions, where TAF was degraded extensively. Investigation of gastrointestinal stability in simulated gastric fluid (SGF), simulated intestinal fluid (SIF) and fed state simulated gastric fluid (FeSSGF) suggested that TAF must be administered in fed state, as the drug was practically stable in FeSSGF as compared to extensive loss at acidic pH and in SGF.
authors: Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67(,) S.A.S. Nagar 160 062, Punjab, India.
authors: Vijaya Madhyanapu
authors: VM
authors: Golla
authors: Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67(,) S.A.S. Nagar 160 062, Punjab, India.
authors: Moolchand
authors: M
authors: Kurmi
authors: Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67(,) S.A.S. Nagar 160 062, Punjab, India.
authors: Karimullah
authors: K
authors: Shaik
authors: Department of Pharmaceutical Analysis, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67(,) S.A.S. Nagar 160 062, Punjab, India. Electronic address: ssingh@niper.ac.in.
authors: Saranjit
authors: S
authors: Singh
mesh_terms: D019380:Anti-HIV Agents / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D044966:Anti-Retroviral Agents / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism*; D004355:Drug Stability; D006801:Humans; D011355:Prodrugs / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism*; D000068698:Tenofovir / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism*
chemical_list: D019380:Anti-HIV Agents; D044966:Anti-Retroviral Agents; D011355:Prodrugs; D000068698:Tenofovir
keywords: LC-HRMS; MS(n); Prodrug; Tenofovir alafenamide fumarate; Tenofovir disoproxil fumarate