Effect of molecular weight on the properties of chitosan films prepared using electrostatic spraying technique

2019 ◽  
Vol 212 ◽  
pp. 197-205 ◽  
Author(s):  
Yu Zhong ◽  
Chenjun Zhuang ◽  
Weiqi Gu ◽  
Yanyun Zhao
Keyword(s):  
Molecular Weight ◽  
Electrostatic Spraying ◽  
Chitosan Films

scholarly journals Perspective in using chitosan films for sensors

2020 ◽  
Author(s):  
Raluca Maria Aileni ◽  
Laura Chiriac ◽  
Irina Sandulache
Keyword(s):  
Molecular Weight ◽  
Surface Resistance ◽  
Cotton Fabrics ◽  
Surface Conductivity ◽  
Particle Content ◽  
Sensor Development ◽  
Hydrophilic Nature ◽  
Hydrophilic Character ◽  
Chitosan Films ◽  
Almost All

This paper presents some aspects concerning the possibilities of using chitosan films for sensor development. The proposed approaches consist of the development of the experimental samples using 100% cotton fabrics (plain weave) coated with a conductive paste based on chitosan (low, medium, and high molecular weight) and copper microparticles. Our samples were obtained using the scraping method and free drying (24 h), followed by crosslinking 2-3 minutes at 150-160°C. Surface resistance was investigated using the resistance tester based on two parallel electrodes. The results showed that textile coated with chitosan paste with metallic particle content has a poorly conductive character. Based on the surface resistivity, was calculated the surface conductivity. Using the VCA Optima device was investigated the surface wettability by contact angle to conclude if the samples present a hydrophilic or hydrophobic character. After these tests, we concluded that almost all samples have a hydrophilic character due in large part to the fact that this polymer (chitosan) has hydrophilic nature.

Weathering of chitosan films in the presence of low- and high-molecular weight additives

2011 ◽  
Vol 84 (3) ◽  
pp. 900-906 ◽  
Author(s):  
A. Sionkowska ◽  
A. Planecka ◽  
J. Kozlowska ◽  
J. Skopinska-Wisniewska ◽  
P. Los
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Chitosan Films

Preparation and characterization of chitosan films with three kinds of molecular weight for food packaging

2020 ◽  
Vol 155 ◽  
pp. 249-259 ◽  
Author(s):  
Yuntao Liu ◽  
Yuan Yuan ◽  
Songqi Duan ◽  
Cheng Li ◽  
Bin Hu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Food Packaging ◽  
Chitosan Films

Evaluation of the dark field method for large association of spread DNA

1978 ◽  
Vol 36 (2) ◽  
pp. 190-191
Author(s):  
Douglas C. Barker
Keyword(s):  
Electron Microscopy ◽  
Molecular Weight ◽  
Mitochondrial Dna ◽  
Extraction Method ◽  
Field Method ◽  
Dark Field ◽  
Kinetoplast Dna ◽  
Field Electron ◽  
Field Electron Microscopy ◽  
Dark Field Electron

A number of satisfactory methods are available for the electron microscopy of nicleic acids. These methods concentrated on fragments of nuclear, viral and mitochondrial DNA less than 50 megadaltons, on denaturation and heteroduplex mapping (Davies et al 1971) or on the interaction between proteins and DNA (Brack and Delain 1975). Less attention has been paid to the experimental criteria necessary for spreading and visualisation by dark field electron microscopy of large intact issociations of DNA. This communication will report on those criteria in relation to the ultrastructure of the (approx. 1 x 10-14g) DNA component of the kinetoplast from Trypanosomes. An extraction method has been developed to eliminate native endonucleases and nuclear contamination and to isolate the kinetoplast DNA (KDNA) as a compact network of high molecular weight. In collaboration with Dr. Ch. Brack (Basel [nstitute of Immunology), we studied the conditions necessary to prepare this KDNA Tor dark field electron microscopy using the microdrop spreading technique.

Introduction

1978 ◽  
Vol 36 (3) ◽  
pp. 543-544
Author(s):  
W. Bernard
Keyword(s):  
Molecular Weight ◽  
Electron Microscope ◽  
Nucleic Acid ◽  
Gene Mapping ◽  
Molecular Genetics ◽  
Cell Biology ◽  
Gene Activity ◽  
Close Connection ◽  
Basic Information ◽  
Simple Systems

In comparison to many other fields of ultrastructural research in Cell Biology, the successful exploration of genes and gene activity with the electron microscope in higher organisms is a late conquest. Nucleic acid molecules of Prokaryotes could be successfully visualized already since the early sixties, thanks to the Kleinschmidt spreading technique - and much basic information was obtained concerning the shape, length, molecular weight of viral, mitochondrial and chloroplast nucleic acid. Later, additonal methods revealed denaturation profiles, distinction between single and double strandedness and the use of heteroduplexes-led to gene mapping of relatively simple systems carried out in close connection with other methods of molecular genetics.

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