Effect of citric acid induced crosslinking on the structure and properties of potato starch/chitosan composite films

Silk sericin/chitosan composite films were successfully prepared for possible future wound dressing applications. To prepare the chitosan, shrimp shells were first washed and finely ground to obtain a fine powder before extracting the chitosan using a chemical reaction method. The sericin was extracted from Thai raw cocoons of Bombyx mori silk worm via boiling and drying. To prepare the silk sericin/chitosan composite films, the silk sericin and chitosan solutions with varying volume ratios were mixed in a magnetic stirrer for 30 minutes. They were then dropped on to a plastic mold. The sample was dried at a temperature of 50 °C. The prepared composite films were characterized using UV-VIS spectroscopy, Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM). The results from our studies could provide a method for future composite film development.

Download Full-text

Effect of the Esterification of Starch with a Mixture of Carboxylic Acids from Yarrowia lipolitica Fermentation Broth on Its Selected Properties

Polymers ◽

10.3390/polym12061383 ◽

2020 ◽

Vol 12 (6) ◽

pp. 1383 ◽

Cited By ~ 1

Author(s):

Ewa Zdybel ◽

Tomasz Zięba ◽

Ewa Tomaszewska-Ciosk ◽

Waldemar Rymowicz

Keyword(s):

Citric Acid ◽

Carboxylic Acids ◽

Fermentation Broth ◽

Potato Starch ◽

Thermal Characteristics ◽

Degree Of Substitution ◽

Process Conditions ◽

Study Results ◽

Yeast Production ◽

Roasting Temperature

Potato starch was esterified with carboxylic acids contained in the fermentation broth from Yarrowia lipolitica yeast production. Various acid concentrations and various roasting temperatures were used to determine effects of process conditions on ester properties, including the number of acid residues attached to starch chains, starch susceptibility to amylolysis, and thermal characteristics of starch phase transitions. Study results demonstrated the effect of both the composition and the dose of the fermentation broth and of roasting temperature of starch on the number of acid residues attached to starch chains. Citric acid was more susceptible to esterification with starch (DS = 5.65%) compared to the α-ketoglutaric acid (DS = 0.12%). In the case of the latter, a higher degree of substitution was determined in the esters produced at higher roasting temperatures. The lowest digestibility (RS = 20%) was demonstrated for the starch esters with the highest degree of substitution with citric acid, whereas all starch esters showed decreased values of the thermal characteristics of pasting.

Download Full-text

Effects of the Surface Characteristics of Nano-Crystalline and Micro-Particle Calcium Phosphate/Chitosan Composite Films on the Behavior of Human Mesenchymal Stem Cells In Vitro

Journal of Biomaterials Science Polymer Edition ◽

10.1163/092050610x540431 ◽

2011 ◽

Vol 22 (17) ◽

pp. 2369-2388 ◽

Cited By ~ 10

Author(s):

Y.-T. Lee ◽

B.-Y. Yu ◽

H.-J. Shao ◽

C.-H. Chang ◽

Y.-M. Sun ◽

...

Keyword(s):

Stem Cells ◽

Mesenchymal Stem Cells ◽

Calcium Phosphate ◽

Composite Films ◽

Human Mesenchymal Stem Cells ◽

Surface Characteristics ◽

Nano Crystalline ◽

Chitosan Composite

Download Full-text

Structure and Properties of Composite Films of Cellulose and Chitosan from Ionic Liquid

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.499.80 ◽

2012 ◽

Vol 499 ◽

pp. 80-84

Author(s):

Huai Fang Wang ◽

Wei Han Huang ◽

Zhi Kai Wang

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Ionic Liquid ◽

Antimicrobial Property ◽

Composite Films ◽

Antibacterial Properties ◽

Strong Interactions ◽

Structure And Properties ◽

Blend Films ◽

Methyl Imidazole

A series of blend films of cellulose and chitosan were prepared from 1-ethyl-3-methyl imidazole acetate ([Emim] Ac) by coagulating with ethanol. Structure, mechanical properties, thermal stability and antibacterial properties were investigated. The results showed that there were strong interactions and good compatibility between cellulose and chitosan in blend films. The blend films possess good mechanical properties and thermal stability, and the existence of chitosan endows blend films with antimicrobial property.

Download Full-text