Copolymerization of N-Carboxyanhydrides of alpha - Amino Acids.

Large-scale synthesis of α-amino acid-N-carboxyanhydrides

Heteroand homopolymers prepared from α-amino acid-N-carboxyanhydrides (NCAs) monomers are widely useful products. The preparation of pure NCA monomers has been extensively studied in the past. Purification methods including repeated crystallizations, extraction, and flash column chromatography have been devised. However, these methods are not easily amendable to large-scale NCA preparations. Th...

Synthesis of Optically Active beta-Amino Acid N-Carboxyanhydrides.

Methodology has been developed for the general synthesis of optically active beta-amino acid N-carboxyanhydrides (beta-NCAs) through cyclization of N(beta)-Boc or N(beta)-Cbz beta-amino acids using phosphorus tribromide. The formation of beta-NCAs was confirmed by spectroscopy as well as an X-ray structural determination of beta-homoalanine-N-carboxyanhydride. The beta-NCA molecules could be po...

conjugated linoleic acids, amino acid profile and other characteristics of meat produced under identical condition from two iranian fat tailed breeds of lamb

گوشت قرمز یکی از مهم ترین فرآورده های دامی در تأمین پروتئین و انرژی می باشد که در حمل ویتامین های محلول در چربی نیز حائز اهمیت می باشد. انسان مانند سایر مهره داران اسید های چرب ضروری (لینولئیک و آلفا لینولنیک) مورد نیاز خود از طریق غذا تأمین می نماید. اسید های چرب ضروی پیش ساز اسید های چرب غیر اشباع با چند پیوند دوگانه هستند. اسید لینولنیک پیش ساز اسیدهای چرب امگا 3 و اسید لینولئیک نیز پیش ساز ...

Antigenicity of Polypeptides (poly Alpha Amino Acids)

It has been shown that the polymers GLA5, GLT, GLA40, and GLAT are antigenic in human beings. Both immediate skin reactions and delayed (cellular) reactions were observed. The antibody produced reacted well in the precipitin reaction, agglutinated antigen coated tanned sheep cells, was less effective in inducing PCA reactions, and failed to sensitize guinea pigs for passive systemic anaphylaxis...

Alpha helix propensity of amino acids.