Amino-Acids of Gelatin

Dakin, H.D.

doi:10.1016/s0021-9258(18)86255-x

Cited by 150 publications

(30 citation statements)

References 8 publications

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“…A small amount of double and triple helices remains present, but G lacks any tertiary or quaternary structure. 49 The presence of positively charged (lysine and arginine, 7.5%), negatively charged (glutamic and aspartic acid, 12%), neutral (glycine, proline, and hydroxyproline, 58%) and hydrophobic (leucine, isoleucine, methionine, and valine, 6%) amino acid residues makes it prone to undergoing different set of interactions with solvent or electrolytes. The expected set of electrostatic, hydrophobic, and H-boding interactions between G and ILs leads to formation of IGs.…”

Section: ■ Introductionmentioning

confidence: 99%

Gelatin-Based Highly Stretchable, Self-Healing, Conducting, Multiadhesive, and Antimicrobial Ionogels Embedded with Ag₂O Nanoparticles

Singh

Damarla

et al. 2017

ACS Sustainable Chem. Eng.

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The polyionic nature of gelatin (G), derived from partial hydrolysis of collagen, is utilized to prepare ionogels (IGs) in conjunction with aqueous mixtures of a polar ionic liquid (IL), 1-ethyl-3-methylimidazolium ethylsulfate, [C 2 mim][C 2 OSO 3 ]. The highly polar nature of IL−H 2 O mixture (50/50 v/v %) supported the high solubility of G, where the IGs are prepared by dissolving equal amount of G to IL−H 2 O mixture (50/50 v/v %) in a stepwise manner at 45 °C while stirring. The combination of IGs with Ag 2 O nanoparticles (NPs) prepared in situ, via photoreduction of AgNO 3 led to induction of antimicrobial activity in IGs, while enhancing the mechanical properties. The prepared IGs show fast self-healing (<1 min) and multiadhesive nature along with reversible stretching efficiency and high conductivity. The conductivity (2 mS cm −1 ) of prepared IG is highest among all biopolymer-based IGs reported, until date. The multiadhesive and highly conducting nature, transparency, inherent shapememory effect, and mechanical stability of the prepared the IGs are expected to be utilized in various electrical and bioelectronic applications. Moreover, these properties can be controlled by tuning the morphology of Ag 2 O NPs and water content in IGs. The method used for preparation of IGs provides a new way for easy, green, and economical preparation of antimicrobial IGs at a reduced temperature, where no harmful reducing agent or UV light is used for in situ preparation of Ag 2 O NPs.

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Section: ■ Introductionmentioning

confidence: 99%

Gelatin-Based Highly Stretchable, Self-Healing, Conducting, Multiadhesive, and Antimicrobial Ionogels Embedded with Ag₂O Nanoparticles

Singh

Damarla

et al. 2017

ACS Sustainable Chem. Eng.

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“…Oxyproline and oxytryptophane were not available for experimental work. It is doubtful whether the former substance can protect red cells against the toxic action of eosin, since gelatin, which contains 14 per cent (7) of this substance, lacks protective ability. Marked protection was shown by each of the two preparations of histidine.…”

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confidence: 99%

Further Studies on Eosin Hemolysis

Schmidt

Norman

1922

Journal of General Physiology

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Additional experimental work on the subject of eosin hemolysis has been carried out. This indicates that red cells may be protected against the toxic action of eosin in sunlight by the presence of inorganic reducing agents. It is pointed out that a marked parallelism exists between the substances which react with the Folin and Denis reagent and the compounds which afford protection to red cells against the photodynamic action of eosin. The property which is possessed in common by all of the substances is that they are easily oxidized, and their ability to protect red cells lies in their power of reduction. The toxic action of eosin probably involves the oxidation of tyrosine and tryptophane which are contained in the protein molecules of the stroma.

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“…The absence from the gelatin spectrum of this band and the one at 2794 is clearly correlated with the lack of tryptophan in this protein (20).…”

Section: Discussionmentioning

confidence: 73%

The Structure of the Ultraviolet Absorption Spectra of Certain Proteins and Amino Acids

Coulter

Stone

Kabat

1936

Journal of General Physiology

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The ultraviolet absorption of the proteins in the region above 2500 A. comprises a broad band with its maximum about 2800 A. The spectrophotometric studies of Judd Lewis (1), Smith (2), and Smith and Marrack (3) have indicated the main quantitative features of this band without, however, disclosing evidence of finer structure. Indeed, with the exception of Spiegel-Adolf and Krumpel (4), who were able to distinguish several maxima in the absorption band of serum albu. rain, those investigators who have used the arc between metallic electrodes, in air, as the source of radiation have not discovered any details of structure. Vl~s and Prager (5) on the other hand found a band system consisting of nine narrow bands in serum albumin, when using the hydrogen discharge tube, which emits a continuous spectrum in the ultraviolet. With such a tube as source Ross (6) has Observed a similar resolution in the absorption bands of gelatin and several other proteins, and Lavin and Northrop (7) have found narrow bands in the absorption of crystalline pepsin.The ultraviolet absorption of the amino acids has likewise been extensively investigated. Although the aliphatic amino acids do not show appreciable absorption above 2500 A., the aromatic amino acids tyrosin, tryptophan, and phenylalanine give absorption in the same spectral region as the proteins, as shown by Dh6r6 (8), Ward (9), Smith (2), Gr6h and Han~k (10) and others. The absorption band of the proteins has in consequence been generally attributed to the content of these amino acids.

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Amino-Acids of Gelatin

Cited by 150 publications

References 8 publications

Gelatin-Based Highly Stretchable, Self-Healing, Conducting, Multiadhesive, and Antimicrobial Ionogels Embedded with Ag₂O Nanoparticles

Gelatin-Based Highly Stretchable, Self-Healing, Conducting, Multiadhesive, and Antimicrobial Ionogels Embedded with Ag₂O Nanoparticles

Further Studies on Eosin Hemolysis

The Structure of the Ultraviolet Absorption Spectra of Certain Proteins and Amino Acids

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Amino-Acids of Gelatin

Cited by 150 publications

References 8 publications

Gelatin-Based Highly Stretchable, Self-Healing, Conducting, Multiadhesive, and Antimicrobial Ionogels Embedded with Ag2O Nanoparticles

Gelatin-Based Highly Stretchable, Self-Healing, Conducting, Multiadhesive, and Antimicrobial Ionogels Embedded with Ag2O Nanoparticles

Further Studies on Eosin Hemolysis

The Structure of the Ultraviolet Absorption Spectra of Certain Proteins and Amino Acids

Contact Info

Product

Resources

About

Gelatin-Based Highly Stretchable, Self-Healing, Conducting, Multiadhesive, and Antimicrobial Ionogels Embedded with Ag₂O Nanoparticles

Gelatin-Based Highly Stretchable, Self-Healing, Conducting, Multiadhesive, and Antimicrobial Ionogels Embedded with Ag₂O Nanoparticles