Abstract:
Biodegradable articles obtained from an enzymatically synthesized amylose which has been enzymatically synthesized with the use of phosphorylase characterized in that the enzymatically synthesized amylose is made up of sugar units linked to each other exclusively via alpha -1,4-bond and has a weight-average molecular weight of 100 kDa or more, preferably 600 kDa or more. Furthermore, the enzymatically synthesized amylose preferably employed herein has a molecular weight distribution of 1.25 or below and may be chemically modified if needed. The above-described biodegradable articles can be produced by using the above enzymatically synthesized amylose or a chemically modified derivative thereof alone or a combination of (a) the enzymatically synthesized and/or a chemically modified derivative thereof with (b) other polymer material(s).
Abstract:
The invention relates to a process for preparing a hydrophobic starch, comprising etherification, esterification or amidation of a root or tuber starch comprising at least 95 wt.% of amylopectin, based on dry substance of the starch, or a derivative thereof, with a substituent comprising an alkyl chain having from 4-24 carbon atoms. The invention further relates to a hydrophobic starch obtainable by said process.
Abstract:
An aqueous adhesive composition and a process for preparing such compositions are disclosed. The composition comprises macromolecular complex comprising (A) a first component comprising (i) a framework element and (ii) a polyphenol, and (B) second component comprising a polypeptide, oligopeptide, amino acid, or polyamine. The 5 framework element comprises (a) a polypeptide, oligopeptide, amino acid, or polyamine, (b) a polysaccharide, oligosaccharide, or monosaccharide, or a saccharide conjugate, or (c) a lignin, a lignan or a lignin conjugate. The polyphenol comprises a tannin, a tannic acid, a flavonoid, or a poly-resorcinol. An adhesive precursor composition comprising the first component is also disclosed.
Abstract:
A novel diazirine-based biocompatible polymer that can be used as on-demand or tuneable bioadhesive and applied across various clinically important surfaces. The biocompatible polymer comprises a single strand of repeating units and up to 5,000 photoreactive diazirine groups covalently attached to it. A bioadhesive composition comprises the polymer of the present invention and suitable solvents, surfactants, stabilizers, fillers and other additives. The composition may additionally contain metallic particles of size less than 50 micron made of rare earth elements and has UV or NIR transparency less than 1 optical density unit per 1 centimetre. The poly-diazirine surface grafted thin films can be used for minimally invasive surgeries.