Applications of powder X-ray diffraction in small molecule pharmaceuticals: achievements and aspirations

NK Thakral, RL Zanon, RC Kelly, S Thakral - Journal of pharmaceutical …, 2018 - Elsevier
Since the discovery of X-ray diffraction and its potential to elucidate crystal symmetry,
powder X-ray diffraction has found diverse applications in the field of pharmaceutical …

Recent advances in the characterization of amorphous pharmaceuticals by X-ray diffractometry

S Thakral, MW Terban, NK Thakral… - Advanced Drug Delivery …, 2016 - Elsevier
For poorly water soluble drugs, the amorphous state provides an avenue to enhance oral
bioavailability. The preparation method, in addition to sample history, can dictate the nature …

Compression-induced crystallization of amorphous indomethacin in tablets: characterization of spatial heterogeneity by two-dimensional X-ray diffractometry

NK Thakral, S Mohapatra, GA Stephenson… - Molecular …, 2015 - ACS Publications
Tablets of amorphous indomethacin were compressed at 10, 25, 50, or 100 MPa using
either an unlubricated or a lubricated die and stored individually at 35° C in sealed Mylar …

Pharmaceutical cocrystals: formulation approaches to develop robust drug products

NK Duggirala, SM LaCasse, MJ Zaworotko… - Crystal Growth & …, 2019 - ACS Publications
Phase transformation of an active pharmaceutical ingredient in the solid state can influence
the physicochemical properties and consequently drug product performance. The neat …

Salt disproportionation: A material science perspective

NK Thakral, RC Kelly - International journal of pharmaceutics, 2017 - Elsevier
While screening the counter-ions for salt selection for an active pharmaceutical substance,
there is often an uncertainty about disproportionation of the salt and hence physical stability …

Challenges in transitioning cocrystals from bench to bedside: Dissociation in prototype drug product environment

S Koranne, A Sahoo, JF Krzyzaniak… - Molecular …, 2018 - ACS Publications
Tablets containing a theophylline–glutaric acid (TG) cocrystal dissociated rapidly forming
crystalline theophylline (20–30%), following storage at 40° C/75% RH for 2 weeks. Control …

Role of lattice disorder in water-mediated dissociation of pharmaceutical cocrystal systems

N Kaur, NK Duggirala, S Thakral… - Molecular …, 2019 - ACS Publications
Our objective is to mechanistically understand the implications of processing-induced lattice
disorder on the stability of pharmaceutical cocrystals. Caffeine–oxalic acid (CAFOXA) and …

Compression-induced polymorphic transformation in tablets: role of shear stress and development of mitigation strategies

NK Thakral, S Thakral, GA Stephenson… - Journal of …, 2019 - Elsevier
Our goals were to evaluate the effects of (i) hydrostatic pressure alone and (ii) its combined
effect with shear stress during compaction, on the polymorphic transformation (form C→ A) …

Investigation of spatial heterogeneity of salt disproportionation in tablets by synchrotron X-ray diffractometry

S Koranne, R Govindarajan… - Molecular …, 2017 - ACS Publications
Tablets which were binary mixtures of pioglitazone hydrochloride (PioHCl) with magnesium
stearate (MgSt), croscarmellose sodium (CCS), microcrystalline cellulose, or lactose …

The importance of water-solid interactions in small molecule drug development: An industry perspective

P Chakravarty, K Nagapudi - TrAC Trends in Analytical Chemistry, 2021 - Elsevier
Water is ubiquitous during pharmaceutical product development and may interact with the
drug substance, formulation additives and the drug product in either solvent or vapor form …