title: A Novel Non-Cumbersome Approach Towards Biosynthesis of Pectic-Oligosaccharides by Non-Aflatoxigenic Aspergillus sp. Section Flavi Strain EGY1 DSM 101520 through Citrus Pectin Fermentation.
abstract: Pectic-Oligosaccharides (POS) have a growing potential in food and feed industries. To satisfy the demand of worldwide markets from POS and avoid the shortcomings of currently applied methodologies encountered in their preparation, the present study highlights a novel robust approach for POS biosynthesis. In the current approach, Aspergillus sp.section Flavi strain EGY1 DSM 101520 was grown on citrus pectin-based medium as a core POS production medium. POS' levels accumulated in the fungal fermentation broth were optimized through a three step sequential statistical mathematical methodology; Plackett-Burman design (PBD), Box-Behnken design (BBD) and canonical analysis. Three key determinants namely citrus pectin, peptone and NaH2PO4 were pointed out by PBD to impose significant consequences (P<0.05) on the process outcome (POS' levels). Optimal levels of these key determinants along with maximal of POS' levels were set by BBD and canonical analysis to be 2.28% (w/v) citrus pectin, 0.026% (w/v) peptone and 0.28% (w/v) NaH2PO4 to achieve a net amount of 1.3 g POS /2.28 g citrus pectin. Through this approach, a yield of 57% (w/w) POS of the total citrus pectin was obtained after 24 h of fungal growth on optimized citrus pectin-based medium. A fold enhancement of 13 times in POS' levels released in the fermentation fungal broth was realized by the end of the optimization strategy. This novel robust approach is considered a new insight towards POS biosynthesis via efficient, rapid and non-cumbersome procedure. To the best of authors' knowledge, the present work is the first article underlining detailed POS production from the fermentation broth of a fungus growing on citrus pectin-based medium.
authors.affiliation: Institute of Graduate Studies and Research, Department of Biotechnology, University of Alexandria, Alexandria, Egypt.
authors.forename: Amira M
authors.initials: AM
authors.lastname: Embaby
authors.affiliation: Institute of Graduate Studies and Research, Department of Biotechnology, University of Alexandria, Alexandria, Egypt.
authors.forename: Ramy R
authors.initials: RR
authors.lastname: Melika
authors.affiliation: Institute of Graduate Studies and Research, Department of Biotechnology, University of Alexandria, Alexandria, Egypt.|Texas Tech University, Department of chemistry and Biochemistry, Lubbock, Texas, United States of America.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Hussein
authors.affiliation: Faculty of Pharmacy, Department of Pharmaceutics, University of Alexandria, Alexandria, Egypt.
authors.forename: Amal H
authors.initials: AH
authors.lastname: El-Kamel
authors.affiliation: Institute of Graduate Studies and Research, Department of Environmental Studies, University of Alexandria, Alexandria, Egypt.|University of Alberta, Department of Civil and Environmental Engineering, Edmonton, AB, Canada.
authors.forename: Heba S
authors.initials: HS
authors.lastname: Marey
mesh_terms: D001230:Aspergillus / Q000254:growth & development* / Q000378:metabolism; D050260:Carbohydrate Metabolism; D005285:Fermentation; D019649:Food Industry; D006863:Hydrogen-Ion Concentration; D009844:Oligosaccharides / Q000096:biosynthesis*; D010368:Pectins / Q000737:chemistry*; D010461:Peptones / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry
chemical_list: D009844:Oligosaccharides; D010461:Peptones; D010710:Phosphates; C586814:citrus pectin; D010368:Pectins; C018279:sodium phosphate