X-Ray Diffractometry & Other Analytical Techniques Publications

R. Suryanarayanan, Determination of the relative amounts of anhydrous carbamazepine (C15H12N2O) and carbamazepine dihydrate (C15H12N2O.2H2O) in a mixture by powder X-ray diffractometry. Pharm. Res., 6, 1017-1024 (1989).

R. Suryanarayanan and T.S. Wiedmann, Quantitation of the relative amounts of anhydrous carbamazepine (C15H12N2O) and carbamazepine dihydrate (C15H12N2O.2H2O) in a mixture by solid state NMR. Pharm. Res., 7, 184-187 (1990).

R. Suryanarayanan, Determination of the relative amounts of α-carbamazepine and β-carbamazepine in a mixture by powder X-ray diffractometry. Powder Diffraction, 5, 155-159 (1990).

R. Suryanarayanan and C.S. Herman, Quantitative analysis of the active tablet ingredient by powder X-ray diffractometry. Pharm. Res., 8, 393-399 (1991).

R. Suryanarayanan, Quantification of carbamazepine in tablets by powder X-ray diffractometry. Advances in X-ray Analysis, 34, 417-427 (1991).

S.P. Duddu, A. Khin-Khin, D.J.W. Grant and R. Suryanarayanan, A novel X-ray powder diffractometric method for studying the reaction between pseudoephedrine enantiomers. J. Pharm. Sci., 86, 340-345 (1997).

N.V. Phadnis, R.K. Cavatur and R. Suryanarayanan, Identification of drugs in pharmaceutical dosage forms by X-ray powder diffractometry. J. Pharm. Biomed. Anal., 15, 929-943 (1997).

N.V. Phadnis and R. Suryanarayanan, Simultaneous quantification of an enantiomer and the racemic compound of ibuprofen by X-ray powder diffractometry. Pharm. Res., 14, 1176-1180 (1997).

R.K. Cavatur and R. Suryanarayanan, Characterization of phase transitions during freeze-drying by in situ X-ray powder diffractometry. Pharm. Dev. Tech., 3, 579-586 (1998).

R. Surana and R. Suryanarayanan, Quantification of crystallinity in substantially amorphous pharmaceuticals and study of crystallization kinetics by XRD, Powder Diffraction, 15, 2-6 (2000).

S.S. Iyengar, N.V. Phadnis and R. Suryanarayanan, Quantitative analyses of complex pharmaceutical mixtures by the Rietveld method, Powder Diffraction, 16, 20-24 (2001).

S. Rastogi, M. Zakrzewski and R. Suryanarayanan, Investigation of solid-state reactions using variable temperature X-ray powder diffractometry. I. Aspartame hemihydrate. Pharm. Res., 18, 267-273 (2001).

A.K. Dash, A. Khin-Khin and R. Suryanarayanan, X-ray powder diffractometric method for quantitation of crystalline drug in microparticulate systems. I: Microspheres. J. Pharm. Sci., 91, 983-999 (2002).

S. Rastogi, M. Zakrzewski and R. Suryanarayanan, Investigation of solid-state reactions using variable temperature X-ray powder diffractometry II. Aminophylline Monohydrate. Pharm. Res., 19, 1265-1273 (2002).

S. Debnath, P. Predecki and R. Suryanarayanan, Use of glancing angle X-ray powder diffractometry to depth-profile phase transformations during dissolution of indomethacin and theophylline tablets. Pharm. Res., 21, 149-159 (2004).

J.D. Meyer, S.J. Bai, M. Rani, R. Suryanarayanan, R. Nayar, J.F. Carpenter and M.C. Manning, Infrared spectroscopic studies of protein formulations containing glycine. J. Pharm. Sci., 93, 1359-1366 (2004).

R. Surana, A. Pyne, M. Rani and R. Suryanarayanan, Measurement of enthalpic relaxation by differential scanning calorimetry - effect of experimental conditions. Thermochimica Acta, 433, 173-182 (2005).

C. Nunes, A. Mahendrasingam and R. Suryanarayanan, Quantification of crystallinity in substantially amorphous materials by synchrotron X-ray powder diffractometry. Pharm. Res., 22, 1942-1953 (2005).

R. Govindarajan, K. Chatterjee, L. Gatlin, R. Suryanarayanan and E.Y. Shalaev, Impact of freeze-drying on ionization of sulfonephthalein probe molecules in trehalose-citrate systems. J. Pharm. Sci., 95, 1498-1510 (2006).

H. Yamada and R. Suryanarayanan, Calculation of the penetration depth of X-rays in intact pharmaceutical film-coated tablets by microdiffractometry. Pharm. Res., 23, 2149-2157 (2006).

M. Rani, R. Govindarajan, R. Surana and R. Suryanarayanan, Structure in dehydrated trehalose dihydrate - evaluation of the concept of partial crystallinity. Pharm Res., 23, 2356-2367 (2006).

D.B. Varshney, S. Kumar, E.Y. Shalaev, S.W. Kang., L. Gatlin and R. Suryanarayanan, Solute crystallization in frozen systems - use of synchrotron radiation to improve sensitivity. Pharm Res., 23, 2368-2374 (2006).

C. Nunes, A. Mahendrasingam and R. Suryanarayanan, Investigation of the multi-step dehydration reaction of theophylline monohydrate using 2-dimensionsal powder X-ray diffractometry. Pharm. Res., 23, 2393-2404 (2006).

R. Govindarajan, A.V. Zinchuk, B.C. Hancock, E.Y. Shalaev and R. Suryanarayanan, Ionization states in the microenvironment of solid dosage forms: Effect of formulation variables and processing. Pharm. Res., 23, 2454-2468 (2006).

H. Yamada, R. Suryanarayanan, X-ray powder diffractometry of intact film coated tablets - an approach to monitor the physical form of the active pharmaceutical ingredient during processing and storage. J. Pharm. Sci., 96, 2029-2036 (2007).

D.B. Varshney, J.A. Elliott, L.A. Gatlin, S. Kumar, R. Suryanarayanan, E.Y. Shalaev, Synchrotron X-ray diffraction investigation of the anomalous behavior of ice during freezing of aqueous systems. J. Phys. Chem. B, 113 (18), 6177-6182 (2009).

D.B. Varshney, P. Sundaramurthi, S. Kumar, E.Y. Shalaev, S.-W. Kang, L.A. Gatlin, R. Suryanarayanan, Phase transitions in frozen systems and during freeze-drying: quantification using synchrotron x-ray diffractometry. Pharm. Res., 26, 1596-1606 (2009).

P. Chakravarty, S. Bhardwaj, L. King, R. Suryanarayanan, Monitoring phase transformations in intact tablets of α, α- Trehalose by FT-Raman spectroscopy, AAPS PharmSciTech, 10, 1420-1426 (2009).

H. Yamada, K. Terada, R. Suryanarayanan, Non-destructive determination of the coating film thickness by X-ray powder diffractometry and correlation with the dissolution behavior of film-coated tablets, J. Pharm. Biomed. Anal., 51 (4), 952-957 (2010).

D. Chen, G. Haugstad, Z.J. Li, R. Suryanarayanan, Water Sorption Induced Transformations in Crystalline Solid Surfaces: Characterization by Atomic Force Microscopy, J. Pharm. Sci., 99 (9), 4032-4041 (2010).

Leave a comment