摘要:
The invention relates to a process for the preparation of insulins from analogs of preproinsulins, which comprises reacting preproinsulin analogs, at a pH below the isoelectric point of the insulins in the presence of trypsin or a trypsin-like endopeptidase, with an ester of natural amino acids or their derivatives and then cleaving off the ester group and other protective groups which may optionally be present.
摘要:
The invention relates to a process for the preparation of an insulin derivative of the formula I ##STR1## in which R.sup.1 denotes H or H-Phe, R.sup.30 represents the radical of a naturally occurring L-aminoacid and R.sup.31 represents a physiologically acceptable organic group of neutral or basic character consisting of 1 to 3 .alpha.-aminoacids in which the terminal carboxyl function is present in the free form and which insulin derivative has an isoelectric point above 5.8, which comprises reacting an insulin of the formula I in which R.sup.30 denotes the radical of a genetically codable L-aminoacid and R.sup.31 represents OH or a protective group of the carboxyl function, with a peptide or aminoacid derivatives of the formula R-R.sup.30 -R.sup.31 consisting of 2 to 4 .alpha.-aminocacids, in which the terminal carboxyl function is in free form, in the presence of a trypsin-like endopeptidase at a pH value below the isoelectric point of the starting insulin.
摘要:
The invention relates to a process for the preparation of peptides of the general formulaArg--Lys--S--Val--Yin which S denotes glutamic acid or .alpha.-aminoadipic acid and Y denotes tyrosine or tryptophan or esters or amides thereof, which comprises subjecting tetrapeptides of the formulaZ--Arg(Z'.sub.2)--Lys(Z')--S--(Bzl)--Val--OHin which Z' represents a protective group of the benzyl type, to a condensation reaction with corresponding tyrosine esters or amides or tryptophan esters or amides and removing the protective groups by hydrogenation. The invention furthermore relates to tetrapeptides as intermediate products of this process.
摘要:
A peptide of the formulaB.sub.1 --B.sub.2 --A.sub.1 --A.sub.2 --Xin whichB.sub.1 denotes a basic aminoacid,B.sub.2 denotes a basic aminoacid,A.sub.1 denotes an aromatic aminoacid,A.sub.2 denotes an aromatic aminoacid andX denotes an aminoacid in which the carboxyl group can be esterified, a process for the preparation thereof and the use thereof.
摘要:
The invention provides a nonapeptide of the formula IGlu-Asp-Ser-Ser-Ser-Thr-Gly-Trp-Asn-OH (I)a process for the preparation thereof and its use, furthermore intermediates for preparing a compound of the formula I.
摘要:
A process for manufacture of insulin, analogs and derivatives thereof by treating an insulin compound wherein the A- and B-chains are linked by a bis-methionyl-carbonyl-bridge, with cyano bromide.
摘要:
A process for the purification of secretin by chromatography on an alkylated dextran gel is disclosed, as is a method of its manufacture appropriate for preparing larger amounts of secretin.
摘要:
A process for manufacture of insulin, analogs and derivatives thereof by treating an insulin compound wherein the A- and B-chains are linked by a bis-methionyl-carbonyl-bridge, with cyano bromide.
摘要:
A process for the manufacture of insulin and derivatives thereof by treating an insulin derivative, wherein the A-chain is cross-linked with the B-chain by means of a sulfonyl diethyl-bisoxycarbonyl bridge and the B-chain may contain an acyl group in the 1-position, with alkali metal hydroxides or quaternary organic bases having a pH value of more than 13.
摘要:
A process for isolating insulin which entails performing high-pressure liquid chromatography with pressure-stable acidic cation exchange material under a pressure of from 1.1 MPa to 40 MPa.