Darstellung von Polyasparaginsäuren (Polyaspartsäuren) aus dem thermischen Autokondensationsprodukt der Asparaginsäure

“…A number of polyacrylates such as poly(sodium acrylate) [2], sodium salt of maleic anhydride-isobutylene copolymer and maleic anhydride-vinyl acetate copolymer have been reported to give excellent builder performances in detergent formulations as compared with sodium tripolyphosphate (STPP). However, they are hardly biodegradable except for their oligomers [3][4][5], which will possibly produce much damage to the environment. Therefore, the biodegradable substitutes for non-biodegradable polymers having carboxylic acid groups are really desirable with a view to protecting the environment.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Poly(maleic anhydride‐co‐taurine) as a Biodegradable Detergent Builder

Pan

Guo

Zhu

2013

J Surfact & Detergents

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Biodegradable poly(maleic anhydride‐co‐taurine) was synthesized by anionic ring‐opening copolymerization of maleic anhydride (MA) and taurine. The structures were characterized by elemental analysis, Fourier transform infrared spectroscopy, nuclear magnetic resonance (1H NMR) and mass spectroscopy. The weight‐average molecular weight (Mw) of the copolymers was tested using multi‐angle laser light scattering instrument. The biodegradability of the copolymers was judged by the shaking table test method. The possibility of the copolymers to be a detergent builder was assessed in terms of the calcium sequestration capacity which was evaluated in accordance with the China National Standard method (GB/T 21884‐2008) and dispersive power test. The results showed that the copolymers were biodegradable, and possessed a high calcium sequestration capacity and a good dispersancy, which were environment‐friendly detergent builders.

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“…Excessive heating of amino acids usually results in the formation of carbonized tar. However, aspartic acid (Kovacs et al 1953 ;Vegotsky et al 1958), glutamic acids , lysine (Harada 1959a) and their ammonium salts and amides (Harada 1959b) were found to undergo selfcondensation and copolymerization with other amino acids by simple heating, because heating of aspartic acid or glutamic acids as well as lysine produces polymerizable intermediates, such as intramolecular anhydrides, imides or amides. The lactams of glutamic acid or lysine in the molten state also served as polar reaction media, facilitating thermal polycondensation.…”

Section: Introductionmentioning

confidence: 99%

Prebiotic formation of polyamino acids in molten urea

et al. 2005

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It is important for research into the origins of life to elucidate polyamino acid formation under prebiotic conditions. Only a limited set of amino acids has been reported to polymerize thermally. In this paper we demonstrate a novel thermal polymerization mechanism in a molten urea of alkylamino acids (i.e. glycine, alanine, b-alanine, a-aminobutyric acid, valine, norvaline, leucine and norleucine), which had been thought to be incapable of undergoing thermal polymerization. Also, aspartic acid was found to polymerize in molten urea at a lower temperature than that at which aspartic acid alone had previously been thermally polymerized. Individual oligomers produced in heating experiments on urea-amino acid mixtures were analysed using a liquid chromatograph mass spectrometer. Major products in the reaction mixture were three different types of polyamino acid derivatives: N-carbamoylpolyamino acids, polyamino acids containing a hydantoin ring at the Nterminal position and unidentified derivatives with molecular weights that were greater by 78 than those of the corresponding peptide forms. The polymerization reaction occurred by taking advantage of the high polarity of molten urea as well as its dehydrating ability. Under the presumed prebiotic conditions employed here, many types of amino acids were thus revealed to undergo thermal polymerization.

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Darstellung von Polyasparaginsäuren (Polyaspartsäuren) aus dem thermischen Autokondensationsprodukt der Asparaginsäure

Cited by 48 publications

References 7 publications

Some Early Historical Aspects of the Thermal Polycondensation of Amino Acids

Some Early Historical Aspects of the Thermal Polycondensation of Amino Acids

Synthesis of Poly(maleic anhydride‐co‐taurine) as a Biodegradable Detergent Builder

Prebiotic formation of polyamino acids in molten urea

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