Physicochemical properties of esters of high-molecular-weight naphthenic acids

1980 ◽  
Vol 16 (1) ◽  
pp. 71-74
Author(s):  
S. A. Mustafaev ◽  
P. D. Shikhalizade
Keyword(s):  
Molecular Weight ◽  
Physicochemical Properties ◽  
High Molecular Weight ◽  
Naphthenic Acids

The Discovery of High Molecular Weight Naphthenic Acids (ARN Acid) Responsible for Calcium Naphthenate Deposits.

2005 ◽  
Author(s):  
Heidi Mediaas ◽  
Nick O. Wolf ◽  
Thomas David Baugh ◽  
Knut V. Grande ◽  
Jens Emil Vinstad
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Naphthenic Acids

The isolation and properties of 1·6 S γ -histone from calf thymocytes

1958 ◽  
Vol 149 (934) ◽  
pp. 36-41 ◽  
Keyword(s):  
Molecular Weight ◽  
Amino Acid ◽  
Physicochemical Properties ◽  
Amino Acid Composition ◽  
High Molecular Weight ◽  
Acid Composition ◽  
The Other ◽  
Amino Acid Compositions

The isolation of 1·6 S γ -histone is described, its amino-acid composition recorded and an account given of some of its physicochemical properties. Its molecular weight has been calculated from sedimentation velocities to be 74000 in its unaggregated condition. It thus represents a second histone of high molecular weight present in the nuclei of calf thymocytes. Both β and 1·6 S γ -histone are distinguished from the other four components in their ability to undergo aggregation. The γ -histone, however, does not aggregate so readily or so extensively as does β -histone. These two histones are also clearly distinguished by their amino-acid compositions.

Production and Physicochemical Properties of Food-Grade High-Molecular-Weight Lactobacillus Inulin

2020 ◽  
Vol 68 (21) ◽  
pp. 5854-5862
Author(s):  
Dawei Ni ◽  
Yingying Zhu ◽  
Wei Xu ◽  
Xiaoyang Pang ◽  
Jiaping Lv ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Physicochemical Properties ◽  
High Molecular Weight ◽  
Food Grade

scholarly journals Oligochitosan Hydrochloride: Preparation and Characterization

INEOS OPEN ◽  
2021 ◽  
Vol 4 ◽  
Author(s):  
V. E. Tikhonov ◽  
◽  
B. B. Berezin ◽  
I. V. Blagodatskikh ◽  
E. A. Bezrodnykh ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Molecular Weight ◽  
Hydrochloric Acid ◽  
Physicochemical Properties ◽  
High Molecular Weight ◽  
Synthetic Approach ◽  
European Pharmacopoeia ◽  
High Molecular Weight Chitosan ◽  
Analytical Protocols

The methods commonly used for depolymerization of chitosan and preparation of oligochitosan are discussed. A synthetic approach to oligochitosan hydrochloride with a molecular weight below 16 kDa based on the treatment of parent industrial high molecular weight chitosan with a mixture of hydrochloric acid and hydrogen peroxide is described. A series of analytical protocols are used to determine the physicochemical properties and quality of resulting oligochitosan hydrochloride according to the European Pharmacopoeia 4.0.

scholarly journals The Effect of Chitosan Type on Biological and Physicochemical Properties of Films with Propolis Extract

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3888
Author(s):  
Karolina Stanicka ◽  
Renata Dobrucka ◽  
Magdalena Woźniak ◽  
Anna Sip ◽  
Jerzy Majka ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Physicochemical Properties ◽  
High Molecular Weight ◽  
Food Packaging ◽  
Transmission Rate ◽  
Antimicrobial Properties ◽  
Propolis Extract ◽  
Oxygen Transmission Rate ◽  
Extract Concentration ◽  
High Molecular Weight Chitosan

The aim of the research was to determine the influence of chitosan type and propolis extract concentration on biological and physicochemical properties of chitosan-propolis films in terms of their applicability in food packaging. The films were prepared using three types of chitosan: from crab shells, medium and high molecular weight and propolis concentration in the range of 0.75–5.0%. The prepared polysaccharide films were tested for antimicrobial properties, oxygen transmission rate (OTR) and water vapor transmission rate (WVTR). Moreover, sorption tests and structural analysis were carried out. Microbiological tests indicated the best antimicrobial activity for the film consisting of high molecular weight chitosan and 5.0% propolis extract. Both the type of chitosan and propolis concentration affected transmission parameters—OTR and WVTR. The best barrier properties were recorded for the film composed of high molecular weight chitosan and 5.0% propolis extract. The results of sorption experiments showed a slight influence of chitosan type and a significant effect of propolis extract concentration on equilibrium moisture content of tested films. Moreover, propolis extract concentration affected monolayer water capacity (Mm) estimated using the Guggenheim, Anderson and de Boer (GAB) sorption model. The obtained results indicate that chitosan films with an addition of propolis extract are promising materials for food packaging applications, including food containing probiotic microorganisms.

Physicochemical properties of a high molecular weight levan from Brenneria sp. EniD312

2018 ◽  
Vol 109 ◽  
pp. 810-818 ◽  
Author(s):  
Wei Xu ◽  
Qian Liu ◽  
Yuxiang Bai ◽  
Shuhuai Yu ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Physicochemical Properties ◽  
High Molecular Weight

Physicochemical properties of high-molecular-weight poly(?,?-malic acid) synthesized by direct polycondensation

2003 ◽  
Vol 50 (1-2) ◽  
pp. 69-75 ◽  
Author(s):  
Tetsuto Kajiyama ◽  
Tetsushi Taguchi ◽  
Hisatoshi Kobayashi ◽  
Kazunori Kataoka ◽  
Junzo Tanaka
Keyword(s):  
Molecular Weight ◽  
Physicochemical Properties ◽  
High Molecular Weight ◽  
Malic Acid ◽  
Direct Polycondensation ◽  
High Molecular Weight Poly
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