title: Gamma radiation effects on microbiological, physico-chemical and antioxidant properties of Tunisian millet (Pennisetum Glaucum L.R.Br.).
abstract: Hygienic quality of Tunisian pearl millet flour is always of major concern to consumers as well as all involved in the production, processing and distribution sectors. In the present study, the microbiological and biochemical properties of this food were examined following gamma-radiation. The D10-values for the Total Aerobic Plate Count, yeasts and moulds were respectively 1.5 and 3.7kGy. Furthermore, millet flour is commonly susceptible to mycotoxin contaminations, so the Ochratoxin A residues were also investigated; a reduction of 74% was observed with 10kGy. Moreover, the radiation process did not significantly alter fatty acids composition of the millet flour as obtained with Gas chromatography-flame ionisation detector technic. The peroxide value had increased from 26.16 to 34.43meqO2/kg with 3kGy. At 1kGy, we noticed an important loss of vitamin A of about 88.6%. In contrast, the total phenolic content, the ABTS-RSA and the DPPH-RSA of the radiated millet flour exhibited non-significant changes (p<0.05).
authors: LIP-MB, National Institute of Applied Sciences and Technology (INSAT), University of Carthage, Tunisia. Electronic address: bmmaha2010@gmail.com.
authors: Maha
authors: M
authors: Ben Mustapha
authors: National Center of Sciences and Nuclear Technologies of Tunis (CNSTN), Pôle Technologique, B.P. 72, Sidi Thabet 2020, Tunisia.
authors: Mehrez
authors: M
authors: Bousselmi
authors: National Center of Sciences and Nuclear Technologies of Tunis (CNSTN), Pôle Technologique, B.P. 72, Sidi Thabet 2020, Tunisia.
authors: Taïeb
authors: T
authors: Jerbi
authors: National Center of Sciences and Nuclear Technologies of Tunis (CNSTN), Pôle Technologique, B.P. 72, Sidi Thabet 2020, Tunisia.
authors: Nasreddine
authors: N
authors: Ben Bettaïeb
authors: LIP-MB, National Institute of Applied Sciences and Technology (INSAT), University of Carthage, Tunisia.
authors: Sami
authors: S
authors: Fattouch
mesh_terms: D000596:Amino Acids / Q000032:analysis; D000975:Antioxidants / Q000737:chemistry*; D005227:Fatty Acids / Q000032:analysis; D005433:Flour / Q000032:analysis / Q000382:microbiology / Q000528:radiation effects; D005506:Food Contamination / Q000032:analysis; D005514:Food Irradiation / Q000379:methods*; D005658:Fungi / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D005720:Gamma Rays; D009183:Mycotoxins / Q000032:analysis / Q000737:chemistry; D008897:Panicum / Q000737:chemistry / Q000382:microbiology* / Q000528:radiation effects*; D031782:Pennisetum; D010636:Phenols / Q000032:analysis; D014416:Tunisia; D014801:Vitamin A / Q000032:analysis
chemical_list: D000596:Amino Acids; D000975:Antioxidants; D005227:Fatty Acids; D009183:Mycotoxins; D010636:Phenols; D014801:Vitamin A
keywords: Antioxidant activities; D(10)-value; GC-FID; Gamma irradiation; Millet; Ochratoxin A