Predominant transesterification reaction catalyzed by immobilized trypsin.
作者:KAZUTAKA TANIZAWA、YUICHI KANAOKA
DOI:10.1248/cpb.32.4514
日期:——
Immobilized trypsin covalently attached to cross-linked dextran was prepared. In the presence of high concentrations of primary and secondary alcohols, the transesterification of L-lysine esters catalyzed by the immobilized trypsin was observed to be predominant. In contrast to this, no transesterified product was detected with tertiary butyl alcohol. These reactions were compared with the acid-catalyzed transesterification reactions and the characteristics of the enzymatic reaction are discussed.
Partial ester of cellulose with nitrogenous carboxylic acid and process for producing the same
申请人:——
公开号:US20030027733A1
公开(公告)日:2003-02-06
According to the present invention, there are provided a novel partial ester of a nitrogenous carboxylic acid ester with cellulose, the partial ester being useful as an antibacterial agent, a flame retardant, etc., and a simple and convenient process for preparing the same. Fibers made of said partial ester have washing-resistant antibacterial property and flame retardancy.
There can be prepared the partial ester of a nitrogenous carboxylic acid ester with cellulose by contacting a nitrogenous carboxylic acid ester with cellulose and heat-treating the mixture.
Peptide werden hergestellt durch Umsetzung von durch eine Nα-Formylgruppe geschützten α-Aminocarbonsäureestern oder Peptidestern als Carboxylkomponente mit α-Aminocarbonsäuren, α-Aminocarbonsäureestern oder α-Aminocarbonsäureamiden als Aminokomponente in Gegenwart einer Serin- oder Thiolprotease.
PARTIAL ESTER OF CELLULOSE WITH NITROGENOUS CARBOXYLIC ACID AND PROCESS FOR PRODUCING THE SAME
申请人:Ajinomoto Co., Inc.
公开号:EP1270598A1
公开(公告)日:2003-01-02
According to the present invention, there are provided a novel partial ester of a nitrogenous carboxylic acid ester with cellulose, the partial ester being useful as an antibacterial agent, a flame retardant, etc., and a simple and convenient process for preparing the same. Fibers made of said partial ester have washing-resistant antibacterial property and flame retardancy.
There can be prepared the partial ester of a nitrogenous carboxylic acid ester with cellulose by contacting a nitrogenous carboxylic acid ester with cellulose and heat-treating the mixture.
HYALURONIC ACID-BASED AMPHIPHILIC POLYMER, PREPARATION METHOD AND APPLICATION THEREOF
申请人:BrightGene Bio-Medical Technology Co., Ltd.
公开号:EP3241852A1
公开(公告)日:2017-11-08
Disclosed are a hyaluronic acid-based amphiphilic polymer, preparation method and application thereof. A main chain of the amphiphilic polymer is a hydrophilic hyaluronic acid and can be employed in active targeting, and a side chain thereof is a hydrophobic group represented by Formula (1). The amphiphilic polymer can carry a small molecule anticancer drug. Polymer nanoparticles are obtained via chemical crosslinking, such that the nanoparticles are not readily dissociated outside a cell or in blood, thus ensuring the stability of a drug encapsulated by the nanoparticles. Upon arriving at a tumor tissue, the hyaluronic acid on a surface of the nanoparticle can immediately combine with a CD44 receptor on a surface of a tumor cell, and effectively enter the tumor cell via endocytosis mediated by the receptor, and then quickly de-crosslink to be dissociated. The drug is quickly released, obtaining an enrichment ratio at a tumor site markedly higher than that of the prior art, resulting in a highly effective treatment, and addressing deficiencies such as drug leakage, low carrying efficiency, low occurrence of endocytosis and slow release in a cell.