Roberto Carrizo Flores

Universidad Nacional de San Luis · Área de Biología

En el presente trabajo se construyó y caracterizó un polarímetro comparandolo con un instrumento patrón. El objetivo es implementar el prototipo en prácticas del laboratorio por su construcción de bajo costo.

The hydration of α-pinene using solid acid catalysts was studied. The catalysts were prepared by impregnating trichloroacetic acid (TCA) on different supports such as silica, titania and zirconia (TCA/SiO2, TCA/TiO2 and TCA/ZrO2·nH2O, respectively). The TCA/TiO2 catalyst converted α-pinene into hydrocarbons, while the TCA/ZrO2·nH2O catalyst was act...

The essential oil of the aerial parts of Baccharis salicifolia was examined by GC and GC-MS and the major components were identified as alpha-pinene, camphene, beta-pinene, alpha-phellandrene, alpha-cubebene, beta-cariophyllene, 6,9-guaiadiene, germacrene D and germacrone. The essential oil was tested against eight Gram positive and Gram negative b...

Artemisia echegarayi Hieron. (Asteraceae) is commonly known in Argentina as “ajenjo”. Many studies report high efficacy of essential oils against food-borne pathogenic bacteria. The antimicrobial activity and minimal inhibitory concentration of A. echegarayi essential oil were evaluated against seven bacterial species of significant importance in f...

Artemisia echegarayi Hieron. (Asteraceae) is commonly known in Argentina as "ajenjo". Many studies report high efficacy of essential oils against food-borne pathogenic bacteria. The antimicrobial activity and minimal inhibitory concentration of A. echegarayi essential oil were evaluated against seven bacterial species of significant importance in f...

Three flavonoids, (2 R,3 R)-5,4'-dihydroxy-3'- O-methyl-7-(gamma,gamma-dimethylallyloxy)dihydroflavonol 1, (2 R,3 R)-5,7,4'-trihydroxy-3'- O-methyl-6-(alpha,alpha-dimethylallyl)dihydroflavonol 2, and (2 R,3 R)-5,7,4'-trihydroxy-6-(alpha,alpha-dimethylallyl)dihydroflavonol 3, together with three known flavonoids ( 4 - 6), were isolated from the aeri...

Listeria monocytogenes is an important foodborne pathogen due to the severity of infection with a high mortality rate. In the past few years, there has been an increase in the use of naturally derived compounds such as plant extracts or essential oils as antimicrobials in food. The objective of the present study was to determine the antimicrobial e...

Aspergillus niger cultures monohydroxylate ilicic alcohol in C-3 in a cis position with respect to the methyl groups at C-4 and C-10, and trans position with respect to the hydroxyl group of C-4. Furthermore, Aspergillus niger cultures reduce ilicic aldehyde to its corresponding alcohol.

Microbial hydroxylation of tedonodiol, an eremophilane alcohol, was carried out with Aspergillus niger cultures, yielding the 2α - hydroxyderivative.

Growth-inhibitory activities of selected natural benzofurans (4-9), trans-cinnamic acid derivatives (10-13), chromene compounds (14 and 16), and some semisynthetic derivatives were determined in last instar larvae of Tenebrio molitor via topical administration in Me2CO. The most inhibitory of the tested compounds were 3-gamma, gamma-dimethylallyl-p...