✦ LIBER ✦

The acetylation and enzymatic degradation of starch films

✍ Scribed by Shohreh Parandoosh; Samuel M. Hudson

Publisher: John Wiley and Sons
Year: 1993
Tongue: English
Weight: 398 KB
Volume: 48
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1993.070480504

No coin nor oath required. For personal study only.

✦ Synopsis

The preparation of films from starch and their degradation by amylase enzymes is described. Starch acetate was prepared by acetylation of starch with a pyridine/acetic anhydride mixture. The resulting polymer was cast into films from solutions of 90% formic acid. A series of films with a range of acetyl content were then exposed to buffered amylase solutions and the retained tensile strength measured. It was found that with a sufficient acetyl content the wet strength of the films was maintained in the aqueous solutions, but that the acetyl content was sufficiently low enough to permit degradation by a mixture of alpha and beta amylases within a period of 1 h. These films could be useful as membranes in bioreactors, which could be degraded at will by the addition of enzymes to the system.

📜 SIMILAR VOLUMES

Enzymatic degradation of native and acet

Enzymatic degradation of native and acetylated starch-based extruded blends

✍ Alain Copinet; Véronique Coma; Jean Paul Onteniente; Yves Couturier 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 204 KB 👁 1 views

Blends including natural wheat starch and acetylated starch (with substitution degree 1.5) have been extruded so as to obtain a new packaging material. The in¯uence of this extrusion upon the biodegradability of the blends was studied for several acetylated to natural starch ratios both by a colouri

Morphology and enzymatic degradation of

Morphology and enzymatic degradation of thermoplastic starch–polycaprolactone blends

✍ M. Vikman; S. H. D. Hulleman; M. Van Der Zee; P. Myllärinen; H. Feil 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 411 KB 👁 1 views

This study's aim was to evaluate the effect of processing conditions on the morphology and enzymatic degradation of 50/50 (w/w) thermoplastic starch-polycaprolactone blends. The blends, produced from native potato starch, glycerol, and polycaprolactone in a melt mixer using different mixing speeds a

Degradability of Different Phosphorylate

Degradability of Different Phosphorylated Starches and Thermoplastic Films Prepared from Corn Starch Phosphomonoesters

✍ Mahmoud Z. Sitohy; Mohamed F. Ramadan 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 28 KB 👁 1 views

Mole phosphate : mole anhydrous glucose. \*\* Degree of substitution. \*\*\* Receiving the same conditions of phosphorylation without adding the phosphate salt. \* Mole phosphate : mole anhydrous glucose. \*\* Degree of substitution. \*\*\* Degree of hydrolysis. \*\*\*\* Receiving the same condition

The Acetylation of Starch by Reactive Ex

The Acetylation of Starch by Reactive Extrusion

✍ Robert A. de Graaf; Annet Broekroelofs; Léon P. B. M. Janssen 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 145 KB 👁 2 views

The acetylation of starch is a chemical modification, known for more than a century Jarowenko [1]. In the modified starch, part of the hydroxyl groups of the glucose monomers have been converted into o-(-ethanoate) groups. Highly acetylated starches with a degree of substitution (DS) of 2 to 3 were

Synthesis, characterization, and enzymat

Synthesis, characterization, and enzymatic degradation of chitosan/PEG hydrogel films

✍ Aylin Altinisik; Kadir Yurdakoc 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 462 KB 👁 2 views

Influence of the oxidation and acetylati

Influence of the oxidation and acetylation of banana starch on the mechanical and water barrier properties of modified starch and modified starch/chitosan blend films

✍ Paul Baruk Zamudio-Flores; Apolonio Vargas Torres; René Salgado-Delgado; Luis Ar 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 287 KB 👁 2 views

## Abstract Banana starch was oxidized at three different levels and afterwards acetylated. The double‐modified starch was used for film preparation with the addition of chitosan. The physical, mechanical, and barrier properties were tested. The oxidation level increased the moisture content of the