scholarly journals A reaction of glucose with peptides

1972 ◽  
Vol 129 (1) ◽  
pp. 203-208 ◽  
Author(s):  
Henry B. F. Dixon
Keyword(s):  
Aqueous Solution ◽  
Acetic Acid ◽  
Blood Glucose ◽  
Dissociation Constant ◽  
Electrophoretic Mobility ◽  
Chemical Properties ◽  
Amino Group ◽  
Half Time ◽  
N Terminus ◽  
And Chemical Properties

Valylhistidine (Val-His) reacts with glucose (Glc) in a mixture of pyridine and acetic acid to form glucosylvalylhistidine (Glc-Val-His). The pK of the α-amino group is thereby lowered to about 5.6 as judged by electrophoretic mobility. The reaction: [Formula: see text] also occurs in an aqueous solution of pyridine and acetic acid of pH6.2 at 50°C, in which it exhibits a half-time of about 30h and a dissociation constant of about 0.3m. Isoleucyltyrosine and glucose react similarly in aqueous solution. The Glc-Val-His has the chromatographic, electrophoretic and chemical properties reported by Holmquist & Schroeder (1966a) for the substance released by proteolysis from the N-terminus of the β-chains of haemoglobin AIc; the value of the dissociation constant means that the concentration of haemoglobin AIc found naturally could be explained by reaction of haemoglobin A with the blood glucose.

The impact of β-cyclodextrin on biological and chemical properties of mianserin hydrochloride in aqueous solution

2020 ◽  
Vol 314 ◽  
pp. 113589 ◽  
Author(s):  
S. Belica-Pacha ◽  
K. Miłowska ◽  
M. Ionov ◽  
M. Bryszewska ◽  
A. Buczkowski ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Chemical Properties ◽  
The Impact ◽  
And Chemical Properties

scholarly journals Enhancement of As(v) adsorption from aqueous solution by a magnetic chitosan/biochar composite

RSC Advances ◽  
2017 ◽  
Vol 7 (18) ◽  
pp. 10891-10900 ◽  
Author(s):  
Shaobo Liu ◽  
Binyan Huang ◽  
Liyuan Chai ◽  
Yunguo Liu ◽  
Guangming Zeng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Zeta Potential ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Magnetic Chitosan ◽  
Physical And Chemical ◽  
And Chemical Properties

In this study, a magnetic chitosan/biochar composite (MCB) was prepared successfully, and characterized by SEM, TEM, VSM, XRD, FTIR, XPS, and zeta-potential to obtain its physical and chemical properties.

scholarly journals Improve the physical and chemical properties of camel's hair fiber in Afif province: تحسين الخصائص الفيزيائية والكيميائية لشعيرات وبر الإبل بمحافظة عفيف

2019 ◽  
Vol 3 (3) ◽  
Author(s):  
Leila Mahmoud Mokhtar, Enas Ibrahim Moussa
Keyword(s):  
Acetic Acid ◽  
Protein Content ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Textile Materials ◽  
Hair Fiber ◽  
German System ◽  
Physical And Chemical ◽  
And Chemical Properties

    The study aimed to draw attention to the camel's hair available in Afif province and to give information about their physical and chemical properties, and improve their properties. The researchers' collected 50 samples of camel's hair, analyze, and then add improvement material. The study concluded that the Afif Province camel's hair have properties that can converted into textile materials. The softness are from 24.5 to 29 μ, (B and C1) according to the classification of the German system GER, and between 58 S And 60 S according to the classification of (USA, AUS, GRB). The thickness between 5.3 - 12 cn/ tex. The length between (3.8 - 25.5 cm), and the colors of camels hair (Brown, light brown, light creamy, dark creamy). The chemical properties were similar to the global chemical properties of wool, Absorption of moisture from 0.10% to 0.26%, the protein content from 52% to 95%, and its capable temperature to 140 °C without occur softness or fusion, and after 140 degree centigrade the decomposition occurs. Characteristics of the camel's hair can improve by adding some chemicals, such as acetic acid to improve the softness without affecting the durability, or by mixed with other fiber.    

scholarly journals Pengaruh Umur Potong dan Konsentrasi Larutan Asam Asetat terhadap Sifat Fisik dan Kimia Gelatin Kulit Babi

2017 ◽  
Vol 10 (1) ◽  
pp. 15
Author(s):  
M. Sompie ◽  
S. Triatmojo ◽  
A. Pertiwiningrum ◽  
Y. Pranoto
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Acetic Acid Solution ◽  
Chemical Properties ◽  
Solution Concentration ◽  
Physical And Chemical Properties ◽  
Pig Skin ◽  
Two Factors ◽  
Physical And Chemical ◽  
And Chemical Properties

<p class="p1">This research was aimed to study the influence of animal age and acetic acid solution concentration on physical and chemical properties. The experiment used Randomized Complete Design (RCD) with two factors and three replicates. The first factor was animal age consisted 3 levels (5, 7 and 9 months). The second factor was concentration of acetic acid solution consisted of 3 levels (2, 4 and 6 percents). The result showed that interaction of animal age period and concentration of acetic acid had no significant effect on gel strength, moisture content, ash content and fat content of pig skin gelatin. It was concluded that pigskin gelatin from ages of 5, 7 and 9 months and concentration acetic acid 2, 4 and 6 % had similar physical and chemical peoperties with the commercial gelatin.</p>

scholarly journals Pengaruh Umur Potong dan Konsentrasi Larutan Asam Asetat terhadap Sifat Fisik dan Kimia Gelatin Kulit Babi

2017 ◽  
Vol 10 (1) ◽  
pp. 15
Author(s):  
M. Sompie ◽  
S. Triatmojo ◽  
A. Pertiwiningrum ◽  
Y. Pranoto
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Acetic Acid Solution ◽  
Chemical Properties ◽  
Solution Concentration ◽  
Physical And Chemical Properties ◽  
Pig Skin ◽  
Two Factors ◽  
Physical And Chemical ◽  
And Chemical Properties

<p class="p1">This research was aimed to study the influence of animal age and acetic acid solution concentration on physical and chemical properties. The experiment used Randomized Complete Design (RCD) with two factors and three replicates. The first factor was animal age consisted 3 levels (5, 7 and 9 months). The second factor was concentration of acetic acid solution consisted of 3 levels (2, 4 and 6 percents). The result showed that interaction of animal age period and concentration of acetic acid had no significant effect on gel strength, moisture content, ash content and fat content of pig skin gelatin. It was concluded that pigskin gelatin from ages of 5, 7 and 9 months and concentration acetic acid 2, 4 and 6 % had similar physical and chemical peoperties with the commercial gelatin.</p>

scholarly journals Structure-function relationships in the free insulin monomer

1986 ◽  
Vol 237 (3) ◽  
pp. 663-668 ◽  
Author(s):  
M A Hefford ◽  
G Oda ◽  
H Kaplan
Keyword(s):  
Chemical Properties ◽  
The Other ◽  
Monomeric Unit ◽  
Crystallographic Structure ◽  
Amino Group ◽  
Ph Profile ◽  
X Ray ◽  
Predominant Species ◽  
N Terminus ◽  
Free Insulin

The chemical properties of the functional groups of insulin were determined at a concentration (0.5 microM) where the predominant species of insulin is the free (unassociated) monomeric unit. The glycine N-terminus and the four tyrosine phenolic groups had the same properties as in the associated forms of insulin. On the other hand the lysine epsilon-amino group and the two histidine imidazole groups had substantially altered properties. Some alteration in the properties of the phenylalanine N-terminus was also observed. The reactivity-pH profile for the imidazole groups showed a second ionization with a pKa of 10.1 in addition to an ionization with a pKa of 6.8. On the basis of the X-ray-crystallographic structure of hexameric insulin the observed changes can be accounted for by disruption of monomer-monomer or dimer-dimer interactions in the associated states of insulin. It is concluded that the conformation of the monomeric unit of insulin is essentially the same in its free and associated states in solution.

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