title: Catalytic oxidation of concentrated orange oil phase by synthetic metallic complexes biomimetic to MMO enzyme.
abstract: BACKGROUND
  This paper reports the catalytic oxidation of the concentrated orange oil phase using the complexes [Fe(III)(BMPP)Cl(micro-O)Fe(III)Cl(3)], [Cu(II)(BTMEA)(2)Cl]Cl and [Co(II)(BMPP)]Cl(2) biomimetic to methane monooxygenase enzyme as catalysts and hydrogen peroxide as oxidant.
  
  
  RESULTS
  The reaction products of oil oxidation, mainly nootkatone, were identified by gas chromatography/mass spectrometry. A screening of catalysts was performed through a full 2(3) experimental design, varying the temperature from 30 to 70 degrees C, the catalyst concentration from 7.0 x 10(-4) to 1.5 x 10(-3) mol L(-1) and the oxidant/substrate molar ratio from 1:1 to 3:1. The results of reaction kinetics employing the most promising catalysts showed that conversions to nootkatone of up to 8% were achieved after 16 h at 70 degrees C.
  
  
  CONCLUSIONS
  The results obtained in this study in terms of nootkatone production should be considered encouraging, since a real, industrially collected, raw material, instead of pure valencene, was employed in the reaction experiments, with a final content about ten times that present in the original concentrated oil.
authors.affiliation: Department of Food Engineering, URI-Campus de Erechim, Av. Sete de Setembro 1621, Erechim, RS, Brazil.
authors.forename: Ilizandra A
authors.initials: IA
authors.lastname: Fernandes
authors.forename: Maria Carolina
authors.initials: MC
authors.lastname: Esmelindro
authors.forename: Marcos L
authors.initials: ML
authors.lastname: Corazza
authors.forename: Elton
authors.initials: E
authors.lastname: Franceschi
authors.forename: Helen
authors.initials: H
authors.lastname: Treichel
authors.forename: Debora
authors.initials: D
authors.lastname: de Oliveira
authors.forename: Caren D
authors.initials: CD
authors.lastname: Frizzo
authors.forename: J Vladimir
authors.initials: JV
authors.lastname: Oliveira
mesh_terms: D040761:Biomimetic Materials / Q000138:chemical synthesis / Q000737:chemistry*; D002384:Catalysis; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000737:chemistry; D007700:Kinetics; D008667:Metalloproteins / Q000737:chemistry*; D009994:Osmolar Concentration; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D010105:Oxygenases / Q000737:chemistry* / Q000378:metabolism; D010938:Plant Oils / Q000737:chemistry*; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes / Q000032:analysis / Q000138:chemical synthesis / Q000737:chemistry
chemical_list: D056831:Coordination Complexes; D008667:Metalloproteins; D016877:Oxidants; D010938:Plant Oils; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes; C506706:valencene; C087245:orange oil; D006861:Hydrogen Peroxide; D010105:Oxygenases; C021555:methane monooxygenase; C050302:nootkatone