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K Dravillas

Bio: K Dravillas is an academic researcher from University of Manchester. The author has contributed to research in topics: Pectinase & Pectin. The author has an hindex of 1, co-authored 1 publications receiving 64 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the possibility of producing pectinases by Rhizopus stolonifer and Aspergillus awamori, using cereal raw materials as substrate, was investigated.

65 citations


Cited by
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Journal ArticleDOI
TL;DR: Production of multienzyme preparations containing pectinolytic, cellulolytic and xylanolytic enzymes by the mesophilic fungi Aspergillus niger BTL, Fusarium oxysporum F3, Neurospora crassa DSM 1129 and Penicillium decumbens under solid-state fermentation on dry orange peels was enhanced by optimization of initial pH of the culture medium and initial moisture level.

260 citations

Journal ArticleDOI
TL;DR: The feasibility of using grape pomace for the production of xylanase and exo-polygalacturonase by Aspergillus awamori in solid state fermentation has been evaluated.

208 citations

01 Jan 2006
TL;DR: This review is an overview of the microorganisms, substrates, and type of culture used for PGase production and provides a description about the strategies used to enhance the production of PGases.
Abstract: Summary Polygalacturonases (PGases) or hydrolytic depolymerases are enzymes involved in the degradation of pectic substances. They have a wide range of applications in food and textile processing, degumming of plant rough fibres and treatment of pectic wastewaters. Bacteria, yeasts and fungi under both submerged (SmF) and solid-state fermentation (SSF) conditions produce these enzymes. Bacteria produce mainly alkaline and thermostable PGases, whilst fungi are the major producers of acidic PGases. In order to obtain high yields of pectinase production, strain improvement and optimization of culture conditions should be considered. This review is an overview of the microorganisms, substrates, and type of culture used for PGase production. It also provides a description about the strategies used to enhance the production of PGases.

114 citations

Journal ArticleDOI
TL;DR: A two-step optimization procedure using central composite design with four factors (concentrations of maltrin and corn steep liquor, agitation speed and inoculation ratio) was used to investigate the effect of these parameters on the polygalacturonase (PG) enzyme activity, mycelia growth (biomass) and morphology (pellet size) of Aspergillus sojae ATCC 20235.

94 citations

Journal ArticleDOI
TL;DR: When milled grains were used, the particle-size distribution and the chemical composition of the medium influenced the rate of micro-organism growth and therefore the trend followed by endo- and ex-PG production, but these two parameters did not affect the maximum production of exo-PG and enda-PG.
Abstract: The production of exo-polygalacturonase (exo-PG) and endo-PG by Aspergillus awamori grown on wheat in solid-state fermentation was studied. Endo- and exo-PG activities were detected after 24 h of inoculation. Glucose released from starch hydrolysis acted as a catabolite repressor for the exo-PG enzyme. In contrast, endo-PG production was not affected by glucose repression. When milled grains were used, the particle-size distribution and the chemical composition of the medium influenced the rate of micro-organism growth and therefore the trend followed by endo- and exo-PG production. However, these two parameters did not affect the maximum production of exo-PG and endo-PG. For one of the milled samples, three different moisture contents were used (50, 55, 60%). Moisture contents of 60% provide a higher yield of pectinases by A. awamori.

72 citations