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Dalmacio Vélez Sársfield, Argentina

Ganan N.A.,National University of Cordoba | Ganan N.A.,Institute Ciencia Y Tecnologia Of Los Alimentos Icta | Dambolena J.S.,Instituto Multidisciplinario Of Biologia Vegetal Imbiv | Martini R.E.,National University of Cordoba | Bottini S.B.,National University of the South
Journal of Supercritical Fluids | Year: 2015

Low-menthol or dementholized oils can be regarded as potential sources of biocidal compounds, particularly monoterpenic ketones such as menthone, piperitone, piperitenone, pulegone and carvone. In this work, the recovery of piperitenone from peppermint oil by supercritical carbon dioxide fractionation is studied. Separation selectivity and gas loading measurements were performed in a semicontinuous high-pressure apparatus in order to evaluate the effect of temperature and solvent density on these properties. Semicontinuous fractionation was also carried out at a fixed temperature (313 K) and pressure (85 bar), collecting and analyzing extract samples until a purified piperitenone raffinate was obtained. The phase behavior of the system was modeled and predicted with the group contribution equation of state (GC-EOS). Good agreement with the experimental results was obtained. Finally, a continuous countercurrent multistage fractionation process was simulated, based on the GC-EOS model. The effect of operation temperature and pressure, solvent-to-feed ratio and reflux ratio was studied for different purity and recovery requirements and oil feed compositions. © 2014 Elsevier B.V. All rights reserved. Source

Dambolena J.S.,CONICET | Zunino M.P.,CONICET | Lopez A.G.,Institute Ciencia Y Tecnologia Of Los Alimentos Icta | Rubinstein H.R.,CONICET | And 6 more authors.
Innovative Food Science and Emerging Technologies | Year: 2010

This work investigated the constituents and the efficacy against Fusarium verticillioides infection and fumonisin production of essential oils of Ocimum basilicum L. and Ocimum gratissimum L. from different locations in Kenya. The oil of leaves and flowering tops of O. basilicum from Sagana contained mainly linalool (95%). The flowering tops and leaves from Yatta contained mainly camphor (32.6 and 31.0%, respectively) and linalool (28.2 and 29.3, respectively). Eugenol was the main constituent in the oil of O. gratissimum leaves from both Sagana (95.5%) and Yatta (70.1%). The oil of the flowering tops had significantly less eugenol. The main component of the oil of flowering tops from Yatta was Z-β-ocimene (34.1%). Oil from both species had some antifungal activity. The oils of O. basilicum and O. gratissimum from different locations showed chemical variation, antifungal activity, free radical scavenging capacity and antimycotoxicogenic property. These properties are attributed to the phenolic compound eugenol. Industrial relevance: This manuscript gives the chemical composition and some biological effects of essential oil of two Ocimum species in Kenya namely Ocimum basilicum L. and Ocimum gratissimum L. The work reveals that there are chemovarieties of these plants in different locations in the country. Of significance is the presence of very high amounts of linalool in one chemovariety of O. basilicum while geranial and neral are major in another. The third variety contains almost equal amounts of camphor and linalool. The first two containing high quantities of linalool, geranial and neral could be cultivated after agronomic studies to provide essential oils useful in perfumery, soap or food industry while that containing camphor and linalool may find use in medicine. Proper seed selection and good agricultural practice for O. gratissimum containing high amount of eugenol could serve as good substitute for cloves which grows best only in a few islands in East Africa. Clove oil due to its high eugenol content has many biological activities including those demonstrated in the present work, and many applications in medicine and commercial world. There is need for more research on these plants especially on cultivation and commercial exploitation of the herbs. © 2009 Elsevier Ltd. All rights reserved. Source

Dambolena J.S.,CONICET | Lopez A.G.,Institute Ciencia Y Tecnologia Of Los Alimentos Icta | Rubinstein H.R.,CONICET | Zygadlo J.A.,CONICET
Food Chemistry | Year: 2010

Menthol is a naturally occurring cyclic terpene alcohol of plant origin from the Lamiaceae family. It has three chiral centres, implying eight possible different stereoisomers, which in turn define four pairs of enantiomers. This is the first work that reports on the stereoselective antifungal and antitoxigenic activities of the menthol stereoisomers on Fusarium verticillioides, with the (-)-menthol and (+)-menthol enantiomers found to be the most active inhibitors of fungal growth and sporulation. The results obtained suggest the importance of the presence of these substituents in the equatorial positions of menthol stereoisomers in the antifungal activity. The stereoisomer (-)-menthol, followed by (+)-menthol, were the most active compounds in the inhibition of fumonisin B1 (FB1) biosynthesis. The different antitoxigenic activities of (-)-menthol and (+)-menthol revealed that the molecular requirements to affect the FB1 production were dependent not only on the presence of the substituents in the equatorial positions, but also on their spatial arrangements. © 2010 Elsevier Ltd. All rights reserved. Source

Dambolena J.S.,CONICET | Dambolena J.S.,Institute Ciencia Y Tecnologia Of Los Alimentos Icta | Lopez A.G.,Institute Ciencia Y Tecnologia Of Los Alimentos Icta | Meriles J.M.,CONICET | And 4 more authors.
Food Control | Year: 2012

Fusarium is a ubiquitous hyalohyphomycete fungus usually isolated from food, which is widespread in different environments (plant, grain, soil) and present at all latitudes. This genus has been widely studied due to its ability to infect, cause tissue destruction and produce mycotoxins on important crops such as corn, wheat and other small grains. Over recent years, much effort has been directed at the search for new antifungal materials from natural sources, and many antimicrobial compounds coming from plants have been identified. Although the essential oils and their components have been recommended as fumigants for preservation of food commodities, little is known about the molecular properties related to the antifungal activity. In the present study, we performed a QSAR study for the inhibition of . Fusarium verticillioides growth by ten natural phenolic compounds, which could serve as a guide for the rational design of further inhibitors. The results of the experimental determinations demonstrated that in terms of the antifungal activity of natural phenolic compounds on . F. verticillioides, the following order was found: carvacrol > thymol > isoeugenol > eugenol > vanillin > creosol > m-cresol > o-cresol, p-cresol, and guaiacol. Mathematical models based on molecular properties, Lipophilicity, Molar refractivity and Saturated area were found to be the descriptors that best explained the antifungal activity of these compounds. These models could be used in future to predict the activity of new compounds and to guide the search for the synthesis of phenolic compounds with the capacity to alter . F. verticillioides growth. © 2012 Elsevier Ltd. Source

Martinez M.L.,CONICET | Martinez M.L.,Institute Ciencia Y Tecnologia Of Los Alimentos Icta | Penci M.C.,National University of Cordoba | Marin M.A.,Institute Ciencia Y Tecnologia Of Los Alimentos Icta | And 2 more authors.
Journal of Food Engineering | Year: 2013

The objectives of this work were to study the combined effects of seed moisture content and pressing temperature on oil recovery and quality parameters of almond oil (AO) and to evaluate the effectiveness of natural (rosemary extract and ascorbyl palmitate) and synthetic antioxidants (TBHQ) on the oxidative stability of AO analyzing chemical changes during an accelerated thermo-oxidation assay. A factorial arrangement was conducted, in pressing experiments, in order to study the combined effects of seed moisture content (4, 6, 8, 10 and 12% (w/w)) and pressing temperature (20, 40 and 60 C) on oil recovery and quality parameters. Oil recovery increased significantly as moisture content raised. The highest oil recovery (79.3%) was obtained at 8% (w/w) seed moisture content and 40 C pressing temperature. All extraction conditions employed were compatible with an acceptable chemical oil quality. Although in the accelerated assay of thermo-oxidation, the TBHQ became the most effective antioxidant, considering natural alternatives, rosemary extract and ascorbyl palmitate combination showed additional protective effect on the AO preservation. © 2013 Elsevier Ltd. All rights reserved. Source

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