Relationship of Structure to Properties of Some Anionic Surfactants as Collectors in the Flotation Process. 1. Effect of Chain Length

1999 ◽  
Vol 44 (1) ◽  
pp. 133-137 ◽  
Author(s):  
N. A. Abdel-Khalek ◽  
A. M. A. Omar ◽  
Y. Barakat
Keyword(s):  
Chain Length ◽  
Anionic Surfactants ◽  
Flotation Process ◽  
Relationship Of

Structure-function relationship of substrate length specificity of dextran glucosidase from Streptococcus mutans

Biologia ◽  
2008 ◽  
Vol 63 (6) ◽  
Author(s):  
Wataru Saburi ◽  
Hironori Hondoh ◽  
Young-Min Kim ◽  
Haruhide Mori ◽  
Masayuki Okuyama ◽  
...  
Keyword(s):  
Structure Function ◽  
High Activity ◽  
Streptococcus Mutans ◽  
Chain Length ◽  
Structural Elements ◽  
Chain Length Specificity ◽  
Structure Function Relationship ◽  
Function Relationship ◽  
Relationship Of ◽  
Long Chain

AbstractDextran glucosidase from Streptococcus mutans (SMDG), an exo-type glucosidase of glycoside hydrolase (GH) family 13, specifically hydrolyzes an α-1,6-glucosidic linkage at the non-reducing ends of isomaltooligosaccharides and dextran. SMDG shows the highest sequence similarity to oligo-1,6-glucosidases (O16Gs) among GH family 13 enzymes, but these enzymes are obviously different in terms of substrate chain length specificity. SMDG efficiently hydrolyzes both short-and long-chain substrates, while O16G acts on only short-chain substrates. We focused on this difference in substrate specificity between SMDG and O16G, and elucidated the structure-function relationship of substrate chain length specificity in SMDG. Crystal structure analysis revealed that SMDG consists of three domains, A, B, and C, which are commonly found in other GH family 13 enzymes. The structural comparison between SMDG and O16G from Bacillus cereus indicated that Trp238, spanning subsites +1 and +2, and short β → α loop 4, are characteristic of SMDG, and these structural elements are predicted to be important for high activity toward long-chain substrates. The substrate size preference of SMDG was kinetically analyzed using two mutants: (i) Trp238 was replaced by a smaller amino acid, alanine, asparagine or proline; and (ii) short β → α loop 4 was exchanged with the corresponding loop of O16G. Mutant enzymes showed lower preference for long-chain substrates than wild-type enzyme, indicating that these structural elements are essential for the high activity toward long-chain substrates, as implied by structural analysis.

scholarly journals In vitro Analysis of the Effect of Alkyl-Chain Length of Anionic Surfactants on the Skin by Using a Reconstructed Human Epidermal Model

2014 ◽  
Vol 63 (10) ◽  
pp. 995-1004 ◽  
Author(s):  
Fumiko Yamaguchi ◽  
Shin-ichi Watanabe ◽  
Fusae Harada ◽  
Miyuki Miyake ◽  
Masaki Yoshida ◽  
...  
Keyword(s):  
Chain Length ◽  
Alkyl Chain ◽  
Anionic Surfactants ◽  
Alkyl Chain Length ◽  
Vitro Analysis ◽  
In Vitro Analysis

Substantivity of Various Anionic Surfactants Applied to Wool

1992 ◽  
Vol 62 (3) ◽  
pp. 140-143 ◽  
Author(s):  
L. A. Holt ◽  
J. S. Kelson ◽  
R. N. Reddie
Keyword(s):  
Nonionic Surfactant ◽  
Chain Length ◽  
Alkyl Chain ◽  
Anionic Surfactants ◽  
Alkyl Chain Length ◽  
Set Up ◽  
Ph Range

Wool samples containing various anionic surfactants (alkylbenzene sulphonates, primary and secondary alkane sulphonates, and an olefin sulphonate) lose some of the surfactant to the treatment liquor when subjected to typical dyeing conditions. At the boil, equilibrium is set up within 15 minutes between the concentration of surfactant in the liquor and that on the fiber. The extent of extraction is influenced by the alkyl chain length of the surfactant, the pH of the liquor, and the bath volume. For many surfactants, less than 5% is extracted at a 20:1 liquor/wool ratio in the pH range 5–6. The presence of nonionic surfactant in the treatment liquors results in slightly higher levels of extraction. Exhaustion of anionic surfactants onto wool gives distributions of surfactant between the wool and liquor similar to those obtained when treated wools are extracted under the same conditions of temperature, pH, and liquor/wool ratio.

Interaction of a new surface sensitive probe compound with anionic surfactants of varying hydrophobic chain length

2011 ◽  
Vol 364 (2) ◽  
pp. 395-399 ◽  
Author(s):  
Arnab Maity ◽  
Prasun Ghosh ◽  
Tarasankar Das ◽  
Jyotirmayee Dash ◽  
Pradipta Purkayastha
Keyword(s):  
Chain Length ◽  
Anionic Surfactants ◽  
Hydrophobic Chain

Synthesis and chain length–anti-HIV activity relationship of fully N - and O -sulfated homooligomers of tyrosine

2001 ◽  
Vol 9 (2) ◽  
pp. 487-492 ◽  
Author(s):  
Masaaki Ueki ◽  
Shigeru Watanabe ◽  
Takeshi Saitoh ◽  
Hideki Nakashima ◽  
Naoki Yamamoto ◽  
...  
Keyword(s):  
Chain Length ◽  
Activity Relationship ◽  
Relationship Of ◽  
Anti Hiv

scholarly journals Structure-activity Relationship of Pamamycins: Effect of Side Chain Length on Aerial Mycelium-inducing Activity

2008 ◽  
Vol 61 (2) ◽  
pp. 98-102 ◽  
Author(s):  
Ikuko Kozone ◽  
Makoto Hashimoto ◽  
Udo Gräfe ◽  
Hiroshi Kawaide ◽  
Hiroshi Abe ◽  
...  
Keyword(s):  
Chain Length ◽  
Aerial Mycelium ◽  
Structure Activity Relationship ◽  
Activity Relationship ◽  
Side Chain ◽  
Side Chain Length ◽  
Structure Activity ◽  
Relationship Of

Relationship of structure to antimicrobial activity in anionic surfactants

1985 ◽  
Vol 19 (11) ◽  
pp. 797-802 ◽  
Author(s):  
B. V. Passet ◽  
A. A. Golubyatnikova ◽  
N. V. Enina ◽  
S. V. Nekrasov ◽  
E. T. Mordvinova
Keyword(s):  
Antimicrobial Activity ◽  
Anionic Surfactants ◽  
Relationship Of
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