Effects of phenolic hydroxyl and carboxyl groups on the concentration of different forms of water in brown coal and their dewatering energy

2016 ◽  
Vol 154 ◽  
pp. 7-18 ◽  
Author(s):  
Yan-Na Han ◽  
Zong-Qing Bai ◽  
Jun-Jie Liao ◽  
Jin Bai ◽  
Xin Dai ◽  
...  
Keyword(s):  
Brown Coal ◽  
Phenolic Hydroxyl ◽  
Carboxyl Groups

THE PROBLEM OF PLASTEIN FORMATION: II. THE CHEMICAL CHANGES INVOLVED IN PLASTEIN FORMATION BY PAPAIN AND BY PEPSIN

1940 ◽  
Vol 18b (9) ◽  
pp. 272-280 ◽  
Author(s):  
H. B. Collier
Keyword(s):  
Enzymatic Hydrolysis ◽  
Free Amino ◽  
Essential Role ◽  
Phenolic Hydroxyl ◽  
Carboxyl Groups ◽  
Hydroxyl Groups ◽  
Chemical Changes ◽  
Phenolic Hydroxyl Groups ◽  
Hydrolysis Of

It has been confirmed that free amino and carboxyl groups disappear during plastein formation from concentrated proteose by crystalline pepsin. Using papain, the changes are obscured by simultaneous hydrolysis. Enzymatic hydrolysis of the plasteins results in the liberation of free amino and carboxyl groups.Reactive "tyrosine" decreases during plastein formation by either enzyme. The same groups are liberated on enzymatic hydrolysis of the plasteins, in a manner analogous to that which takes place in the hydrolysis of typical proteins.It is concluded that in so far as the changes in amino, carboxyl, and "tyrosine" groups are concerned, the plasteins are similar to typical proteins. It is further suggested that the phenolic hydroxyl groups of tyrosine play an essential role in the structure of the protein molecule.Benzaldehyde was found to have no effect on the formation of plastein from proteose by crystalline pepsin.

Comparative Studies of Brown Coal and Lignin. II. The Action of Concentrated Alkali at Elevated Temperatures

1960 ◽  
Vol 13 (4) ◽  
pp. 567 ◽  
Author(s):  
BM Lynch ◽  
RA Durie
Keyword(s):  
Functional Groups ◽  
Brown Coal ◽  
Comparative Studies ◽  
Elevated Temperatures ◽  
Carboxyl Groups ◽  
Hydroxyl Groups ◽  
Brown Coals ◽  
Simple Chemical ◽  
Phenolic Hydroxyl Groups ◽  
Dihydric Phenol

A study was made of the products formed by treating brown coal or lignin with concentrated aqueous or ethanolic alkali at 200 �C. With brown coals a major redistribution of the oxygen-containing functional groups appeared to occur, because the products contained aliphatically linked carboxyl groups and aliphatic hydroxyl, as well as phenolic hydroxyl groups. The behaviour of lignin under the same conditions was less clear but sufficiently similar to that of brown coal to suggest that reactions of the same type were occurring in both cases. Reactions involving decarboxylation, ring scission of dihydric phenol structures, and subsequent hydrogenation are suggested tentatively as the main steps in the formation of the products. The results provide some additional evidence for the view that there is a simple chemical relation between Victorian brown coal and lignin.

Determination of carboxyl groups in Yallourn brown coal

Fuel ◽  
1990 ◽  
Vol 69 (11) ◽  
pp. 1456-1458 ◽  
Author(s):  
Harry N.S. Schafer ◽  
Mary J. Wornat
Keyword(s):  
Brown Coal ◽  
Carboxyl Groups

The nature of olefins and carboxyl groups in an Australian brown coal resin

1984 ◽  
Vol 7 (2) ◽  
pp. 161-168 ◽  
Author(s):  
Michael A. Wilson ◽  
Philip J. Collin ◽  
Anthony M. Vassallo ◽  
Nigel J. Russell
Keyword(s):  
Brown Coal ◽  
Carboxyl Groups

Role of carboxyl groups in the disintegration of brown coal briquettes by water sorption

1997 ◽  
Vol 50 (1) ◽  
pp. 57-68 ◽  
Author(s):  
Jun-ichi Ozaki ◽  
Yoshiyuki Nishiyama ◽  
Peter J. Guy ◽  
Geoffrey J. Perry ◽  
David J. Allardice
Keyword(s):  
Brown Coal ◽  
Water Sorption ◽  
Carboxyl Groups

Acidity distribution of carboxyl groups in Loy Yang brown coal: its analysis and the change by heat treatment

2003 ◽  
Vol 260 (1) ◽  
pp. 176-183 ◽  
Author(s):  
Kenji Murakami ◽  
Ryuhei Kondo ◽  
Kiyoshi Fuda ◽  
Toshiaki Matsunaga
Keyword(s):  
Heat Treatment ◽  
Brown Coal ◽  
Carboxyl Groups ◽  
Its Analysis

Influence of Calcium Ions on the Plant Cell Surface: Membrane Fusions and Conformational Changes

1974 ◽  
Vol 32 ◽  
pp. 154-155
Author(s):  
D. James Morré ◽  
Charles E. Bracker ◽  
William J. VanDerWoude
Keyword(s):  
Cell Wall ◽  
Cell Surface ◽  
Conformational Changes ◽  
Calcium Ions ◽  
Surface Membrane ◽  
Carboxyl Groups ◽  
Cross Linking ◽  
Ultrastructural Evidence ◽  
Glycine Max L ◽  
Wall Extensibility

Calcium ions in the concentration range 5-100 mM inhibit auxin-induced cell elongation and wall extensibility of plant stems. Inhibition of wall extensibility requires that the tissue be living; growth inhibition cannot be explained on the basis of cross-linking of carboxyl groups of cell wall uronides by calcium ions. In this study, ultrastructural evidence was sought for an interaction of calcium ions with some component other than the wall at the cell surface of soybean (Glycine max (L.) Merr.) hypocotyls.

Sign in / Sign up

Export Citation Format

Share Document