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ORGANIC SPECTROSCOPY

Read all about Organic Spectroscopy on ORGANIC SPECTROSCOPY INTERNATIONAL 

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DR ANTHONY MELVIN CRASTO Ph.D

DR ANTHONY MELVIN CRASTO Ph.D

DR ANTHONY MELVIN CRASTO, Born in Mumbai in 1964 and graduated from Mumbai University, Completed his Ph.D from ICT, 1991,Matunga, Mumbai, India, in Organic Chemistry, The thesis topic was Synthesis of Novel Pyrethroid Analogues, Currently he is working with GLENMARK PHARMACEUTICALS LTD, Research Centre as Principal Scientist, Process Research (bulk actives) at Mahape, Navi Mumbai, India. Total Industry exp 30 plus yrs, Prior to joining Glenmark, he has worked with major multinationals like Hoechst Marion Roussel, now Sanofi, Searle India Ltd, now RPG lifesciences, etc. He has worked with notable scientists like Dr K Nagarajan, Dr Ralph Stapel, Prof S Seshadri, Dr T.V. Radhakrishnan and Dr B. K. Kulkarni, etc, He did custom synthesis for major multinationals in his career like BASF, Novartis, Sanofi, etc., He has worked in Discovery, Natural products, Bulk drugs, Generics, Intermediates, Fine chemicals, Neutraceuticals, GMP, Scaleups, etc, he is now helping millions, has 9 million plus hits on Google on all Organic chemistry websites. His friends call him Open superstar worlddrugtracker. His New Drug Approvals, Green Chemistry International, All about drugs, Eurekamoments, Organic spectroscopy international, etc in organic chemistry are some most read blogs He has hands on experience in initiation and developing novel routes for drug molecules and implementation them on commercial scale over a 30 year tenure till date Dec 2017, Around 35 plus products in his career. He has good knowledge of IPM, GMP, Regulatory aspects, he has several International patents published worldwide . He has good proficiency in Technology transfer, Spectroscopy, Stereochemistry, Synthesis, Polymorphism etc., He suffered a paralytic stroke/ Acute Transverse mylitis in Dec 2007 and is 90 %Paralysed, He is bound to a wheelchair, this seems to have injected feul in him to help chemists all around the world, he is more active than before and is pushing boundaries, He has 9 million plus hits on Google, 2.5 lakh plus connections on all networking sites, 50 Lakh plus views on dozen plus blogs, He makes himself available to all, contact him on +91 9323115463, email amcrasto@gmail.com, Twitter, @amcrasto , He lives and will die for his family, 90% paralysis cannot kill his soul., Notably he has 19 lakh plus views on New Drug Approvals Blog in 216 countries......https://newdrugapprovals.wordpress.com/ , He appreciates the help he gets from one and all, Friends, Family, Glenmark, Readers, Wellwishers, Doctors, Drug authorities, His Contacts, Physiotherapist, etc

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Cocrystals of telmisartan: characterization, structure elucidation, in vivo and toxicity studies


Cocrystals of telmisartan: characterization, structure elucidation, in vivo and toxicity studies

 

CrystEngComm, 2014, 16,8375-8389
DOI: 10.1039/C4CE00797B, Paper
Renu Chadha, Swati Bhandari, Jamshed Haneef, Sadhika Khullar, Sanjay Mandal
 
*Corresponding authors
aUniversity Institute of Pharmaceutical Sciences, Panjab University, Chandigarh-160014, India 
E-mail: renukchadha@rediffmail.com ;
Tel: +91 9316015096
bDepartment of Chemical Sciences, Indian Institute of Science Education and Research, Sector 81, Manauli PO, S.A.S. Nagar, Mohali, India 
E-mail: sanjaymandal@iisermohali.ac.in ;
Tel: +91 9779932606
 
 
The present study reports novel cocrystals of telmisartan (TEL) with saccharin and glutaric acid.
 
The present study reports novel cocrystals of telmisartan (TEL) with saccharin and glutaric acid. Crystal engineering approaches such as solution crystallization, solid-state grinding and slurry method have been utilized with the ultimate objective of improving the solubility of this BCS class II drug. The physical characterization revealed that the cocrystals are unique vis-à-visthermal, spectroscopic and X-ray diffraction properties. Structural characterization showed that the cocrystals with saccharin and glutaric acid exist in monoclinic P21/c and triclinic P[1 with combining macron] space groups, respectively. The improved solubility of telmisartan–saccharin (TEL–SAC) (nine-fold) and telmisartan–glutaric acid (two-fold) cocrystals in comparison with the free drug has been demonstrated in solubility experiments in phosphate buffer, pH 7.5. The TEL–SAC cocrystal remained stable in the aqueous medium for 6 hours as confirmed by PXRD. The AUC0–24 of TEL–SAC and TEL–GA was found to be 2-fold and 1.4-fold increased in terms of bioavailability than pure TEL, respectively. The in vivo antihypertensive activity of TEL–SAC in DOCA salt-induced hypertensive rats showed two-fold improved efficacy, while acute toxicity studies revealed no signs of toxicity in rats even at doses of 2000 mg kg−1 of body weight (BW). The new solid phase of telmisartan with saccharin represents a promising and viable opportunity for the manufacture of a drug product with improved therapeutic outcomes.

Characterization of the “hygroscopic” properties of active pharmaceutical ingredients


J Pharm Sci. 2008 Mar;97(3):1047-59.

Characterization of the “hygroscopic” properties of active pharmaceutical ingredients.

Source

SSCI, Inc., West Lafayette, IN, USA. ann.newman@aptuit.com

http://www.ncbi.nlm.nih.gov/pubmed/17630643

Abstract

The amount of water vapor taken up by an active pharmaceutical ingredient (API) as a function of relative humidity is routinely evaluated to characterize and monitor its “hygroscopicity” throughout the drug development process. In this minireview we address the necessity of going beyond the measurement of water vapor sorption isotherms to establish the various mechanisms by which solids interact with water and the important role played by the crystalline or amorphous form of the solid. Practical approaches for choosing experimental conditions under which water vapor sorption should be measured, including the pre-treatment of samples and the time allowed to reach an equilibrium state are presented. With the assistance of a flowchart, we provide a basis for the systematic examination of samples to establish the likely mechanisms of sorption and the indicators pointing toward future problems with physical and chemical instabilities. Finally, we present strategies for managing materials that might be susceptible to the detrimental effects of water vapor sorption.

(Copyright) 2008 Wiley-Liss, Inc.

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