Loss of rutin and antioxidant activity of asparagus juice caused by a pectolytic enzyme preparation from Aspergillus niger

2007 ◽  
Vol 105 (1) ◽  
pp. 173-178 ◽  
Author(s):  
T SUN ◽  
J POWERS ◽  
J TANG
Keyword(s):  
Antioxidant Activity ◽  
Aspergillus Niger ◽  
Enzyme Preparation ◽  
Pectolytic Enzyme

Characteristics of the immobilized pectin lyase activity from a commercial pectolytic enzyme preparation

1990 ◽  
Vol 10 (6) ◽  
pp. 531-539 ◽  
Author(s):  
P. Lozano ◽  
A. Manjón ◽  
J. L. Iborra ◽  
D. M. Gálvez
Keyword(s):  
Enzyme Preparation ◽  
Pectin Lyase ◽  
Lyase Activity ◽  
Pectolytic Enzyme

scholarly journals Polyprenol phosphate as an acceptor of mannose from guanosine diphosphate mannose in Aspergillus niger

1972 ◽  
Vol 126 (5) ◽  
pp. 1203-1208 ◽  
Author(s):  
R. M. Barr ◽  
F. W. Hemming
Keyword(s):  
Aspergillus Niger ◽  
Enzyme Preparation ◽  
Cetyl Alcohol ◽  
Incubation Mixture ◽  
Guanosine Diphosphate

Growth of Aspergillus niger in the presence of [2-14C]mevalonate and 32Pi led to the formation of a lipid, containing 14C (0.14% of dose) and 32P (0.009% of dose), that had chromatographic properties identical with those of exo-methylene-hexahydropolyprenol phosphate. When a particulate enzyme preparation from the thallus of A. niger was incubated with GDP-[14C]mannose, the main radioactive products were mannose 1-phosphate (57% of products) and mannose (18%). In addition radioactive mannan (8%) and a mannolipid (2%) were formed. The latter was identified as exo-methylene-hexahydropolyprenol phosphate mannose on the basis of its chromatographic properties, acid lability and on the increase in formation of the mannolipid when the phosphate of exo-methylene-hexahydropolyprenols was added to the incubation mixture. The phosphates of ficaprenols and cetyl alcohol caused no corresponding increase. These observations are interpreted as evidence that the thallus of A. niger contains a mannose transferase that uses the phosphate of exo-methylene-hexahydropolyprenols as an acceptor. This situation is discussed in the light of the analogous involvement of a prenol phosphate mannose as an intermediate in the biosynthesis of bacterial wall mannan.

scholarly journals Microbial Transformation of (-)-Nopol Benzyl Ether: Direct Dihydroxylation of Benzene Ring

2010 ◽  
Vol 5 (9) ◽  
pp. 1934578X1000500 ◽  
Author(s):  
Yoshiaki Noma ◽  
Yoshinori Asakawa
Keyword(s):  
Antioxidant Activity ◽  
Aspergillus Niger ◽  
Benzene Ring ◽  
Microbial Transformation ◽  
Benzyl Ether

The biotransformation of (-)-nopol benzyl ether (5) by Aspergillus Niger TBUYN-2 and A. niger Tiegh CBSYN was investigated. A. niger biotransformed 5 to afford (-)-4-oxonopol-2’,4’-dihydroxybenzyl ether (6), and (-)-4-oxonopol (7) as main products. Compound 6 showed strong antioxidant activity (IC50 30.2 μM), which was very similar to that of butyl hydroxyl anisol (BHA).

Multiple forms of glycosidases in an enzyme preparation from Aspergillus niger: Partial characterization of a β-apiosidase

1997 ◽  
Vol 21 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Ziya Günata ◽  
Isabelle Dugelay ◽  
M.J. Vallier ◽  
J.C. Sapis ◽  
C. Bayonove
Keyword(s):  
Aspergillus Niger ◽  
Enzyme Preparation ◽  
Partial Characterization ◽  
Multiple Forms
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