On the role of peptides in the pyrolysis of amino acids

Sharma, Ramesh K.; Chan, W. Geoffrey; Wang, Jia; Waymack, Bruce E.; Wooten, Jan B.; Seeman, Jeffrey I.; Hajaligol, Mohammad R.

doi:10.1016/j.jaap.2004.03.009

Cited by 74 publications

(80 citation statements)

References 16 publications

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“…The amounts of LTT and HTT in each run were calculated from the differences in the weights of the Cambridge pad before and after the pyrolysis. above observations are totally consistent with those observed from pyrolysis in TGA [35].…”

Section: Overall Product Distributionsupporting

confidence: 92%

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Product compositions from pyrolysis of some aliphatic α-amino acids

Sharma¹,

Chan²,

Hajaligol³

2006

Journal of Analytical and Applied Pyrolysis

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Section: Overall Product Distributionsupporting

confidence: 92%

“…The loss of nitrogen as NH 3 or HCN may be relatively small at this temperature. These results are consistent with those from pyrolysis in a thermogravimetric analyzer (TGA) discussed elsewhere [35].…”

Section: Overall Product Distributionsupporting

confidence: 90%

Product compositions from pyrolysis of some aliphatic α-amino acids

Sharma¹,

Chan²,

Hajaligol³

2006

Journal of Analytical and Applied Pyrolysis

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“…Phenol may form during pyrolysis via either direct decarboxylation and deamination (Fig. 5, left hand side) widely documented in literature (Basiuk, 1998;Douda and Basiuk, 2000;Chiavari et al, 2001;Sharma et al, 2004;Li et al, 2008) or in modified, radical assisted Table 2 Quantified yields (wt%) of phenolic compounds from fractional co-pyrolysis of lignin, cellulose, pectin, tyrosine, and glutamic acid mixture at different temperatures in N 2 at 1 atm.…”

Section: Mechanistic Explanation For the Drastic Reduction Of Phenol mentioning

confidence: 91%

Phenols from pyrolysis and co-pyrolysis of tobacco biomass components

2015

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Phenol and its derivatives (phenol, o-, m-, p-cresols, catechol, hydroquinone, methoxy substituted phenols, etc. referred to as phenolic compounds or phenols) are well-known toxicants that exist in the environment and affect both human and natural ecosystems. This study explores quantitatively the yields of phenolic compounds from the thermal degradation (pyrolysis and oxidative pyrolysis) of common tobacco biomass components (lignin, tyrosine, ethyl cellulose, sodium alginate, and laminarin) as well as some mixtures (lignin/tyrosine, ethyl cellulose/tyrosine and sodium alginate/tyrosine) considered important in high temperature cooking, tobacco smoking, and forest fires. Special attention has been given to binary mixtures including those containing tyrosine-pyrolysis of binary mixtures of tyrosine with lignin and ethyl cellulose results in significant reductions in the yields of majority phenols relative to those from the thermal degradation of tyrosine. These results imply that the significant reductions of phenol yields in mixtures are not only dependent upon the mass fractions of the components but also the synergetic inhibition effect of biomass components on the thermal degradation of tyrosine. A mechanistic description of this phenomenon is suggested. The results may also be implied in tobacco industry that the cigarette paper (as ethyl cellulose derivative) may play a critical role in reducing the concentration of phenolic compounds released during tobacco burning.

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“…These [39,41] two compounds are both reported in the literature to be formed upon chitin pyrolysis; however, acetic acid is a common pyrolysis product obtained by several biopolymers such as wood [30] and humic matter [32], while acetamide is a typical product from pyrolysis of microbial cell walls [33] and could be formed upon pyrolysis of other precursors such as (3); mannosan (4); 1,6-anhydrogalactofuranose (5); levoglucosan (6); 1,6-anhydroglucofuranose (7); tetradecanoic (myristic) acid (8); C15 acids (9); hexadecanol (10); hexadecenoic acids (11); hexadecanoic (palmitic) acid (12); octadecen-9-ol (13); C17 acids (14); octadecanol (15); octadecenoic acid isomers (16); octadecanoic acid (17); monomyristin (18); eicosadienoic acids (19); eicosenoic acids (20); eicosanoic acid (21); monopalmitin (22); docosenoic acid (23); docosanoic (24); monostearin (25); tetracosenoic acids (26); tetracosanoic acid (27); hexacosanoic acid (28); cholestanol (29); octadocanoic (30). hexadecanoic acid, hexadecyl ester (31) thermally labile proteins [36]. However, the formation of these markers was attributed to the polysaccharide matrix of coral organic matter since chitin is largely present in some marine organisms (e.g.…”

Section: Polysaccharidesmentioning

confidence: 99%

Analytical pyrolysis-based study on intra-skeletal organic matrices from Mediterranean corals

et al. 2014

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Off-line analytical pyrolysis combined with gas chromatography–mass spectroscopy (GC–MS), directly or after trimethylsilylation, along with infrared spectroscopy and amino acid analysis was applied for the first time to the characterization of the intra-skeletal organic matrix (OM) extracted from four Mediterranean hard corals. They were diverse in growth form and trophic strategy namely Balanophyllia europaea and Leptopsammia pruvoti—solitary corals, only the first having zooxanthelle—and Cladocora caespitosa and Astroides calycularis—colonial corals, only the first with zooxanthelle. Pyrolysis products evolved from OM could be assigned to lipid (e.g. fatty acids, fatty alcohols, monoacylglicerols), protein (e.g. 2,5-diketopiperazines, DKPs) and polysaccharide (e.g. anhydrosugars) precursors. Their quantitative distribution showed for all the species a low protein content with respect to lipids and polysaccharides. A chemometric approach using principal component analysis (PCA) and clustering analysis was applied on OM mean amino acidic compositions. The small compositional diversity across coral species was tentatively related with coral growth form. The presence of N-acetyl glucosamine markers suggested a functional link with other calcified tissues containing chitin. The protein fraction was further investigated using novel DKP markers tentatively identified from analytical pyrolysis of model polar linear dipeptides. Again, no correlation was observed in relation to coral ecology. These analytical results revealed that the bulk structure and composition of OMs among studied corals are similar, as it is the textural organization of the skeleton mineralized units. Therefore, they suggest that coral’s biomineralization is governed by similar macromolecules, and probably mechanisms, independently from their ecology.

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On the role of peptides in the pyrolysis of amino acids

Cited by 74 publications

References 16 publications

Product compositions from pyrolysis of some aliphatic α-amino acids

Product compositions from pyrolysis of some aliphatic α-amino acids

Phenols from pyrolysis and co-pyrolysis of tobacco biomass components

Analytical pyrolysis-based study on intra-skeletal organic matrices from Mediterranean corals

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