title: Decontamination of sugar syrup by pulsed light.
abstract: The pulsed light produced by xenon flash lamps was applied to 65 to 67 °Brix sugar syrups artificially contaminated with suspensions of Saccharomyces cerevisiae and with spores of Bacillus subtilis, Geobacillus stearothermophilus, Alicyclobacillus acidoterrestris,  and Aspergillus niger. The emitted pulsed light contained 18.5 % UV radiation. At least 3-log reductions of S. cerevisiae, B. subtilis, G. stearothermophilus, and A. acidoterrestris suspended in 3-mm-deep volumes of sugar syrup were obtained with a fluence of the incident  pulsed light equal to or less than 1.8 J/cm(2), and the same results were obtained for B. subtilis and A. acidoterrestris suspended in 10-mm-deep volumes of sugar syrup. A. niger spores would require a more intense treatment; for instance, the maximal log reduction  was close to 1 with a fluence of the incident pulsed light of 1.2 J/cm(2). A flowthrough reactor with a flow rate of 320 ml/min and a flow gap of 2.15 mm was designed for pulsed light treatment of sugar syrup. Using this device, a 3-log reduction of A. acidoterrestris spores  was obtained with 3 to 4 pulses of incident pulsed light at 0.91 J/cm(2) per sugar syrup volume.
authors.affiliation: Claranor SA, Chemin de la Rollande, Agroparc, BP 21 531, F-84916 Avignon cedex 9, France.
authors.forename: Aline
authors.initials: A
authors.lastname: Chaine
authors.forename: Caroline
authors.initials: C
authors.lastname: Levy
authors.forename: Bernard
authors.initials: B
authors.lastname: Lacour
authors.forename: Christophe
authors.initials: C
authors.lastname: Riedel
authors.forename: Frédéric
authors.initials: F
authors.lastname: Carlin
mesh_terms: D056450:Alicyclobacillus / Q000528:radiation effects; D001234:Aspergillus niger / Q000528:radiation effects; D001412:Bacillus subtilis / Q000528:radiation effects; D002241:Carbohydrates; D003257:Consumer Product Safety; D003666:Decontamination / Q000379:methods*; D004307:Dose-Response Relationship, Radiation; D005506:Food Contamination / Q000032:analysis / Q000517:prevention & control; D005516:Food Microbiology; D005519:Food Preservation / Q000379:methods*; D001411:Geobacillus stearothermophilus / Q000528:radiation effects; D006358:Hot Temperature; D006801:Humans; D012441:Saccharomyces cerevisiae / Q000528:radiation effects; D013171:Spores, Bacterial / Q000528:radiation effects; D014466:Ultraviolet Rays
chemical_list: D002241:Carbohydrates