Reference

Selective electrogenerative oxidation of benzyl alcohol with platinum-graphite packed-bed anodes

Selective electrogenerative oxidation of benzyl alcohol with platinum-graphite packed-bed anodes. Dieckmann, G. R.; Langer, S. H. (Chem. Eng. Dep., Univ. Wisconsin, Madison, WI 53706, USA). Journal of Applied Electrochemistry, 27(1), 1-8 (English) 1997 Chapman & Hall. CODEN: JAELBJ. ISSN: 0021-891X. DOCUMENT TYPE: Journal CA Section: 72 (Electrochemistry) Section cross-reference(s): 22, 25 The selective electrogenerative oxidn. of benzyl alc. in 1M sulfuric acid solns. was studied on several types of graphite supported platinum packed-bed anodes in a hybrid continuous-flow cell with an oxygen gas diffusion cathode. Benzaldehyde formed preferentially on all three catalytic packed-beds under electrogenerative conditions (Eanode < 0.75 V) where the platinum catalyst was not irreversibly oxidized. Tin-palladium chloride graphite-pretreatment before platinum deposition through ethanol redn. significantly enhanced catalytic activity. This electrocatalyst provided current densities ￡77 mA cm-2 (superficial packed-bed cross sectional area) with a platinum loading of 0.89% Pt on graphite at relative low polarization. The origin of the catalytic activity is discussed and evidence is presented on the roles of tin and palladium. Benzyl alc. oxidn. appears to provide a sensitive probe reaction for demonstrating the existence of special types of catalytic centers.

Volatile compounds secreted by the oyster mushroom (Pleurotus ostreatus) and their antibacterial activities

Volatile compounds secreted by the oyster mushroom (Pleurotus ostreatus) and their antibacterial activities. Beltran-Garcia, Miguel J.; Estarron-Espinosa, Mirna; Ogura, Tetsuya ( Departamento de Quimica, Universidad Autonoma de Guadalajara. Av. Patria 1201, Guadalajara, Mex.). Journal of Agricultural and Food Chemistry, 45(10), 4049-4052 (English) 1997 American Chemical Society. CODEN: JAFCAU. ISSN: 0021-8561. DOCUMENT TYPE: Journal CA Section: 10 (Microbial, Algal, and Fungal Biochemistry) Section cross-reference(s): 17 The oyster mushroom (Pleurotus ostreatus) is widely cultivated, but the volatile compds. it produces are little known. Several methods of isolation of volatile components were compared: extn. by carbon tetrachloride, vacuum distn., and conveyance by nitrogen flow. The obsd. order of extn. efficiency was CCl4 > vacuum > N2. Compds. extd. by CCl4 were 3-octanone, 3-octanol, 1-octen-3-ol, benzaldehyde, 1-octanol, benzoic acid, and an unidentified trace component. The extd. mixt. of compds. demonstrated strong antibacterial activity against some bacterial strains. Addn. of a facsimile mixt. contg. these volatile compds. to a culture broth resulted in complete inhibition of the eight bacteria used for antibacterial assay. Benzaldehyde, which does not contribute notably to the inhibition of bacterial growth, is formed as a reaction to the stress of CCl4 contact or vacuum dehydration. The amt. of benzaldehyde produced may be an indicator of the degree of stress imposed.