Maceration of some plant pectic materials with aspergillus niger pectinases produced on orange peel with solid state fermentation

Document Type : Original Article

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Abstract

Different forms' C{'pectinase's liffi>'procfucel:r by the fungal isolates tested.
Aspergilius niger No. 30 was found as the most active strains tested for PG, PGL,
PMG, PMGL and PMGE biosynthesis, Asp < /em>ergillus achuleatus was highest pectinases
!61~~rs, but found in the second order. Enzymes productivity reached its maximum
afte(i~120, 96, 144, 120 and 144 hours of incubation for PG, PGL, PMG, PMGL and
iJ l~~ir respectively. The highest biosynthesis of pectinases were observed at 30°C
~ri1'~~t1.0 in the medium containing 3% 0NN) sugar cane molasse as carbon and
enE?J.9Y source. 0.07% and 0.105% as nitrogen content of corn steep liquor induced
greatly' PG, PMG, PMGE and PGL, PMGLase activities, respectively. A. niger
cultures produced highest amount of pectinases between 0.5: 1 to 0.7: 1 (solid waste to
liquid ratio of the fermentation media. PH 4, 7, 6, 8 and 6 were round as the optimum
pH for PG, PGL, PMG, PMGL and PMGE, respectively. A. niger pectinases were
found stable between pH 4.0 to pH 8.0. 30, 40, 50, 50 and 40°C were found as the
optimum temperature for these enzymes, respectively. These enzymes were also
highest stable up to 60°C, then decreased gradually. Some of meta! ions such as Na+
induced greatly pectinases activity, but other such as Hg+2 reduced greatly these
enzymes activities. Aspergillus niger pectinases system success with higher grade to
hydrolysis some plant materials, this is due to its having pectate and pectin enzymes.
Therefore, these enzymes systems well useful in the biotechnological process of fruit
and vegetable tissues such as fruit and vegetable extraction and clarification.

Keywords

Journal of Agricultural Chemistry and Biotechnology
Volume 27, Issue 4
April 2002
Pages 2527-2543

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