A CoMFA Analysis of Selected Physical Properties of Amino Acids in Water

1995 ◽  
Vol 14 (1) ◽  
pp. 19-23 ◽  
Author(s):  
Wayne E. Steinmetz
Keyword(s):  
Amino Acids ◽  
Physical Properties

Studies on the Development of Benzoyl Peroxide Catalysed Rapid Oil Tanning using Linseed Oil

2021 ◽  
Vol 116 (7) ◽  
Author(s):  
Bindia Sahu ◽  
Jaya Prakash Alla ◽  
Gladstone Christopher Jayakumar
Keyword(s):  
Amino Acids ◽  
Tensile Strength ◽  
Physical Properties ◽  
Water Absorption ◽  
Benzoyl Peroxide ◽  
Special Class ◽  
Linseed Oil ◽  
Tanning Process ◽  
Remarkable Reduction ◽  
Better Than

Leather tanning is a stabilisation process of skin fibers. This is achieved by the interaction of collagen amino acids with tanning agents to stabilise skin from putrefaction. Tanning of collagen with oil is a special class of tanning known as chamois tanning. Chemically, the oil tanning involves oxidation of unsaturation present in the oil, which is generally achieved by exposing oil treated skins to air. In this study, Benzoyl peroxide has been used as an accelerating agent for oxidation of unsaturated bonds present in the linseed oil for oil tanning process. Results shows remarkable reduction in tanning duration from fifteen days to two days. The chamois leathers prepared using oxidation accelerant (Benzoyl peroxide) have been evaluated for physical properties such as water absorption (611%), tensile strength (18 N/mm2) and percentage of elongation (66 %) which are found to be better than control leathers.

Co-assembly of helical β3-peptides: a self-assembled analogue of a statistical copolymer

2017 ◽  
Vol 89 (12) ◽  
pp. 1809-1816 ◽  
Author(s):  
Claire Buchanan ◽  
Christopher J. Garvey ◽  
Patrick Perlmutter ◽  
Adam Mechler
Keyword(s):  
Amino Acids ◽  
Physical Properties ◽  
Self Assembly ◽  
Unnatural Amino Acids ◽  
The Self ◽  
Microscopy Imaging ◽  
Wide Range ◽  
Self Assembled ◽  
Unnatural Peptides ◽  
Natural Amino Acids

AbstractUnnatural peptide self-assembly offers the means to design hierarchical nanostructures of controlled geometries, chemical function and physical properties. N-acyl β3 peptides, where all residues are unnatural amino acids, are able to form helical fibrous structures by a head-to-tail assembly of helical monomers, extending the helix via a three point supramolecular hydrogen bonding motif. These helical nanorods were shown to be stable under a wide range of physical conditions, offering a self-assembled analogue of polymeric fibres. Hitherto the self-assembly has only been demonstrated between identical monomers; however the self-assembly motif is sequence-independent, offering the possibility of hetero-assembly of different peptide monomers. Here we present a proof of principle study of head-to-tail co-assembly of two different helical unnatural peptides Ac-β3[WELWEL] and Ac-β3[LIA], where the letters denote the β3 analogues of natural amino acids. By atomic force microscopy imaging it was demonstrated that the homo-assembly and co-assembly of these peptides yield characteristically different structures. Synchrotron small angle X-ray scattering experiments have confirmed the presence of the fibres in the solution and the averaged diameters from modelled data correlate well to the results of AFM imaging. Hence, there is evidence of co-assembly of the fibrous superstructures; given that different monomers may be used to introduce variations into chemical and physical properties, the results demonstrate a self-assembled analogue of a statistical co-polymer that can be used in designing complex functional nanomaterials.

Preparation of some long-chain N-acyl derivatives of essential amino acids for nutritional studies

1980 ◽  
Vol 58 (7) ◽  
pp. 573-576 ◽  
Author(s):  
Alenka Paquet
Keyword(s):  
Amino Acids ◽  
Fatty Acids ◽  
Physical Properties ◽  
Essential Amino Acids ◽  
Nutritional Studies ◽  
Derivatives Of ◽  
Acyl Derivatives ◽  
Long Chain

Long-chain N-acyl derivatives of methionine, tryptophan, threonine, and lysine (N6) have been obtained by the reaction of succinimidyl esters of fatty acids with the unprotected amino acids. Their physical properties have been characterized.

THE PHYSICAL PROPERTIES OF SPIDER'S SILK AND THEIR ROLE IN THE DESIGN OF ORB-WEBS

1976 ◽  
Vol 65 (2) ◽  
pp. 483-506 ◽  
Author(s):  
MARK DENNY
Keyword(s):  
Amino Acids ◽  
Physical Properties ◽  
Breaking Stress ◽  
Structural Elements ◽  
Extension Ratio ◽  
Shock Absorbers ◽  
Orb Web ◽  
Degree Of Crystallization ◽  
Minimum Expenditure

1. Determinations were made of several physical properties of the viscid and frame silks of the orb-webs built by the spider Araneus sericatus (Cl.). 2. Both types of silk show a breaking stress of approximately 1 GN/m2 and an initial resilience of approximately 0.35. 3. The breaking extension ratio of viscid silk (λ = 3.00) is much greater than that of frame silk (λ = 1.25), and the viscid silk relaxes to a relatively greater extent. 4. These properties are correlated with the degree of crystallization of the protein from which the silk is made, this factor being controlled by the sequence of amino acids in the protein. 5. The physical properties of the viscid and frame silks allow them to function effectively as shock absorbers and structural elements, respectively; and allow the orb-web to function as an aerial filter with a minimum expenditure of material and energy.

scholarly journals Estimation of physical properties of amino acids by group-contribution method

2018 ◽  
Vol 175 ◽  
pp. 148-161 ◽  
Author(s):  
Spardha Jhamb ◽  
Xiaodong Liang ◽  
Rafiqul Gani ◽  
Amol Shivajirao Hukkerikar
Keyword(s):  
Amino Acids ◽  
Physical Properties ◽  
Group Contribution ◽  
Group Contribution Method

Development of the Synthesis of Chromium and Molybdenum – Amino Acid Complexes: A Green Chemistry Approach

2015 ◽  
Vol 1101 ◽  
pp. 276-279
Author(s):  
Kun Sri Budiasih ◽  
Chairil Anwar ◽  
Sri Juari Santosa ◽  
Hilda Ismail
Keyword(s):  
Amino Acids ◽  
Magnetic Properties ◽  
Amino Acid ◽  
Complex Formation ◽  
Green Chemistry ◽  
Physical Properties ◽  
Elemental Analysis ◽  
Stable Condition ◽  
Molecular Formula ◽  
Optimum Ph

Some concepts of green chemistry were applied on the Synthesis of Chromium(III) and Mo(V) complexes with amino acids. Three concepts were used in this research were changing to safer solvent, using less energy and appliying a shorter process. The optimum pH of the complex formation of Chromium (III) is 4, whereas for Mo(V) complex, the most stable condition is at pH=1. The products were characterized by physical properties, Infrared and Uv-Vis spectrophotometer, Atomic Absorbtion Spectrophotometer, Elemental Analysis, and VSM (Vibrational Sample Magnetometer). The molecular formula of the complexes were predicted by simulation from the composition and the magnetic properties.

scholarly journals Some Nutritional and Physical Properties of Different Zambian Market Classes of Bambara Groundnut (Vigna subterranea)

2019 ◽  
Vol 9 (1) ◽  
pp. 34
Author(s):  
Vincent Nyau ◽  
Lukonde Mwelwa-Zgambo ◽  
Taonga Chirwa-Moonga ◽  
Dorothy Nthani ◽  
Shiv Prakash ◽  
...  
Keyword(s):  
Amino Acids ◽  
Physical Properties ◽  
Seed Mass ◽  
Essential Amino Acids ◽  
Bambara Groundnut ◽  
Crude Fibre ◽  
Swelling Capacity ◽  
Mass Properties ◽  
Market Class ◽  
Hydration Capacity

Selected nutritional and physical properties of the two commonly cultivated Zambian market classes of Bambara groundnut (red and brown) were investigated to establish their end-user traits. Nutritional (essential amino acids, proximate and mineral compositions) and physical (hydration capacity, hydration index, swelling capacity, swelling index and 100 seed mass) properties were investigated using established standard methods. All the essential amino acids were present in both the red and brown Bambara groundnuts. The highest amount was recorded for leucine (9.7 g/100g protein) in the brown Bambara groundnut and least for methionine (1.2 g/100g protein) in the red market class. All the essential amino acids except methionine in the brown Bambara groundnut market class were above the recommended WHO/FAO provisional requirements for children (2 – 5 years) and adults. The crude protein values ranged from 14.62-18.55 g/100g, total ash (4.21 – 4.29 g/100g), crude fibre (2.79 – 5.33 g/100g), fat (6.28 – 6.54 g/100g), moisture (8.95 – 9.13 g/100g) and carbohydrate (59.23 – 60.34 g/100g). Potassium was found to be the most concentrated mineral in both market classes, followed by phosphorous, magnesium and calcium, while lead, mercury and arsenic were not detected. The swelling capacity, swelling index, hydration capacity, and hydration index of the two market classes of Bambara groundnuts were not significantly different, whereas their 100 seed mass was significantly different, with the brown recording the highest.

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