@article {44619,
	title = {Education with a purpose},
	journal = {Current Science},
	volume = {115},
	year = {2018},
	month = {JUL },
	pages = {20-21},
	issn = {0011-3891},
	author = {Nangia, Ashwini K.}
}
@article {47115,
	title = {Enhanced solubility, permeability, and tabletability of nicorandil by salt and cocrystal formation},
	journal = {Crystengcomm},
	volume = {23},
	year = {2021},
	month = {JAN },
	pages = {227-237},
	type = {Article},
	abstract = {<p>Cocrystallization is a rational selection crystal engineering approach for the development of novel solid forms with enhanced physicochemical and mechanical properties. Nicorandil (NCR) is a niacinamide vitamin derivative used to treat angina pectoris. A binary solid form screen of NCR with homologous dicarboxylic acids afforded NCR-oxalic acid (NCR-OA, 1:1), NCR-fumaric acid (NCR-FA, 1:1), NCR-succinic acid (NCR-SA, 1:1), and NCR-suberic acid (NCR-SBA, 1:0.5). The binary solids were characterized by powder X-ray diffraction, IR and NMR spectroscopy, and DSC. NCR-FA and NCR-SBA were crystallized by slow evaporation from chloroform and toluene solvents, respectively. Single crystal X-ray diffraction confirmed that NCR-FA is a molecular salt, while NCR-SBA is a neutral cocrystal. NCR and the FA anion are connected via the robust carbovlate-pyridinium synthon, whereas in the NCR-SBA cocrystal, the components associate via the carboxylic acid- -pyridine synthon. The phase stability, solubility, dissolution rate, diffusion rate and tabletability studies have demonstrated that the binary solids exhibit improved physical and mechanical properties compared to the NCR drug. Specifically, the NCR-FA salt and NCR-SBA cocrystal have higher solubility, dissolution rate, and hardness at lower pressures, making the formulation suitable for tablet compression.</p>
},
	issn = {1466-8033},
	doi = {10.1039/d0ce01316a},
	author = {Mannava, M. K. Chaitanya and Gunnam, Anilkumar and Lodagekar, Anurag and Shastri, Nalini R. and Nangia, Ashwini K. and Solomon, K. Anand}
}
@article {47684,
	title = {Entacapone polymorphs: crystal structures, dissolution, permeability, and stability},
	journal = {Crystal Growth \& Design},
	volume = {21},
	year = {2021},
	month = {OCT },
	pages = {5573-5585},
	type = {Article},
	abstract = {Entacapone (ETP) is a catechol-O-methyltransferase (COMT) drug used to treat Parkinson{\textquoteright}s disease. ETP is available in the marketplace under the brand name Comtan since 2010, and ETP form-I was first reported in a patent published in 2001. However, analysis of its Xray crystal structures and stability relationship of ETP polymorphs and their dissolution and permeability profile have not yet been reported. We crystallized two new conformational polymorphs of ETP from a water and acetone mixture and studied the structural origin of polymorphism and their phase transformations, stability, equilibrium solubility, dissolution, and permeability properties. The ETP molecule adopts different conformations in the polymorphic structures with slight changes in carbonyl and nitrile group orientations. Thermal analysis suggests that form-III and form-IV are enantiotropically related to form-I, which is the thermodynamically stable form at ambient conditions. In contrast, form-II is monotropically related to form-I. Equilibrium solubility, dissolution, and permeability studies show that form-II persists in the slurry medium and dissolves faster with a high flux rate compared to the stable form-I in phosphate buffer solution at 37 +/- 0.5 degrees C.},
	issn = {1528-7483},
	doi = {10.1021/acs.cgd.1c00381},
	author = {Bommaka, Manish Kumar and Mannava, M. K. Chaitanya and Rai, Sunil K. and Suresh, Kuthuru and Nangia, Ashwini K.}
}
@article {47719,
	title = {The effects of cis and trans butenedioic acid on the physicochemical behavior of lumefantrine},
	journal = {Crystengcomm},
	volume = {24},
	year = {2022},
	month = {JAN },
	pages = {156-168},
	type = {Article},
	abstract = {The present work investigates the effects of cis and trans butenedioic acid isomers (maleic acid and fumaric acid) on the crystallinity and pharmaceutical behavior of lumefantrine. Differential scanning calorimetry (DSC), powder X-ray diffraction (PXRD), attenuated total reflectance infrared spectroscopy (ATR-IR), solid-state nuclear magnetic resonance spectroscopy (ss-NMR), and single-crystal X-ray diffraction (SC-XRD) studies were employed. Lumefantrine-fumaric acid crystallized as a salt in the monoclinic space group P2(1)/c. In comparison, DSC and PXRD showed the formation of a co-amorphous solid with maleic acid. Complete proton transfer with a strong ionic interaction led to crystalline salt formation with the trans isomer, whereas weaker/fewer hydrogen bonds with the cis isomer of butenedioic acid led to a co-amorphous salt. The in vitro dissolution of both salts resulted in a similar 2.6-2.7-fold improvement in dissolution rate when compared to that of the crystalline lumefantrine. The crystalline and co-amorphous salts were stable under accelerated stability conditions (40 +/- 2 degrees C and 75 +/- 5\% RH) for one month.},
	doi = {10.1039/d0ce01709d},
	author = {Tomar, Devendrasingh and Lodagekar, Anurag and Gunnam, Anilkumar and Allu, Suryanarayana and Chavan, Rahul B. and Tharkar, Minakshi and Ajithkumar, T. G. and Nangia, Ashwini K. and Shastri, Nalini R.}
}
