Usv Private Limited

Divya Lal Saksena

Chandrakesan Muralidharan

Nikhil Umesh Mohe

Lester John Lobo

Digamber Shripati Pawar

Rakesh Shekhawat

Nilesh Dagdu Patil

Dhananjay Govind Sathe

Avinash Venkatraman Naidu

Shrikant Mishra

Subramanian Sundaram

Mandar Ravindra Maduskar

Radhakrishnan Venkatasubramanian Tarur

Sagar Satyanarayan Zawar

Radhakishnan Venkatasubramanian Tarur

Bharti Prabhakarrao Deshmukh

Praful Shamrao Chavre

Sanjay Vyankatrao Patil

Sukumar Ramanujam

Anindya Sibnath Bhattacharyya

Dinesh Kumar Paliwal

Aruna Khare

Pankaj Prabhakar Malpure

Dilip Kumar Rana

Radharkrishnan Venkatsubramanian Tarur

Ramanujam Sukumar

Sundaram Subramanian

The present invention relates to analytical methods such as molecular weight determination of polypeptide, in particular Glatiramer acetate. The present invention further relates to an improved process for preparation of polypeptides or pharmaceutically acceptable salts thereof, particularly Glatiramer acetate also known as Copolymer-1. The present invention further relates to characterization of Glatiramer acetate by peptide mapping.

Copolymer-1, process for preparation and analytical methods thereof

A process for the production of pramlintide, a 37-mer peptide, is provided. The synthesis provides a high yield synthesis of the peptide in relatively pure form. Further purification can be achieved by preparative HPLC.

Process for the synthesis of 37-mer peptide pramlintide

The present invention relates to an improved process for the large scale synthesis of cyclic heptapeptide using Fmoc solid phase synthesis technique. The described process assembles the peptide on a solid support resin by coupling to one another by peptide bonds to obtain a peptide wherein the coupling of cysteine to the resin employs a combination of solvents to reduce cysteine racemization. The process described relates to the use of C1-C4 alcohols as total substitute to organic nitriles thus making the process cost effective, non-toxic and eco-friendly.

Process for the synthesis of cyclic heptapeptide

The present invention relates to a process for improving pegylation reaction yield of r-metHuG-CSF comprising conjugating r-metHuG-CSF to a PEG aldehyde at a free amine moiety at the N terminal end on the G-CSF in presence of a reducing agent in a pegylation buffer solution comprising a polyol having the formula CHOwhere n is from 3 to 6, or a carbohydrate, or a derivative thereof wherein the concentration of said polyol or carbohydrate or derivative thereof is in the range of 0.1% to 10% w/w.

Process for gram scale production of PEG-r-metHuG-CSF

This invention relates a process for preparing octreotide and derivatives thereof. The starting material, Cys(Trt)-2-Chlorotrityl resin is coupled with various amino acids to obtain a protected heptapeptide of formula (2): Boc-D-Phe-Cys(Trt)-Phe-D-Trp-Lys(Boc)-Thr(OBut)-Cys(Trt)-2-Chlorotrityl resin. The linear protected peptide of formula (2) is cleaved from the support using TFA5TIS and water to yield linear protected peptide of formula (3) Boc-D-Phe-Cys(Trt)-Phe-D-Trp-Lys(Boc)-Thr(OBut)-Cys(Trt)-OH Linear protected heptapeptide of formula (3) is deprotected to yield heptapeptide of formula (6): D-Phe-Cys-Phe-D-Tip-Lys-Thr-Cys-OH; which is cyclized using hydrogen peroxide and to the cyclic peptide of formula (7) D-Phe-Cys-Phe-D-Trp-Lys-Thr-Cys-OH; threoninol is coupled at C terminal to yield octreotide. Alternatively threoninol is coupled to the heptapeptide of formula (3) to yield protected octapeptide of formula (4) Boc-D-Phe-Cys(Trt)-Phe-D-Trp-Lys(Boc)-Thr(OBut)-Cys(Trt)-Thr-OL which is subsequently deprotected to yield linear octapeptide of formula (5) D-Phe-Cys-Phe-D-Trp-Lys-Thr-Cys-Thr-OL and cyclized with hydrogen peroxide to yield cyclic octreotide with a yield of &#x3e;95%. 

Process for synthesis of cyclic octapeptide

The present invention relates to an improved process for the preparation of N-(aminoiminomethyl)-N-(3-mercapto-1-oxopropyl)-L-lysylglycyl-L-&#x3b1;-aspartyl-L-tryptophyl-L-prolyl-L-cysteinamide, cyclic(1&#x2192;6)-disulfide of formula (1), which involves assembling a peptide chain comprising of six amino acids and a thioalkyl carboxylic acid in a required sequence on a solid support to obtain a peptide bound resin of formula (2), capping the free amino groups after each coupling, cleaving Dde group in the peptide of formula (2) from the solid support to obtain peptide-solid support of formula (3), guanylating the peptide of formula (3) at &#x3b5;-lysine-NHin an organic solvent to obtain peptide-solid support of formula (4), cleaving and deprotecting all groups in the peptide of formula (4) from the solid support to obtain peptide-amide formula (5), oxidizing the SH-peptide of formula (5) with an appropriate oxidizing agent to obtain the crude peptide-amide of formula (1) and purifying the crude peptide-amide of formula (1) by chromatographic technique. The solid support is either resin or a cellulose support like cotton, gauze, fabric, paper and perloza beads. The described process is simple, easy, environment friendly, takes lesser time and more cost effective.

Solid phase Fmoc chemistry process to prepare peptides

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Mumbai, India

Divya Lal Saksena