Alberto Yuste
University of Valencia
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Featured researches published by Alberto Yuste.
Journal of Virological Methods | 2013
Irene López-Fabuel; T. Wetzel; Edson Bertolini; Alexandra Bassler; Eduardo Vidal; Luis B. Torres; Alberto Yuste; Antonio Olmos
A real-time multiplex RT-PCR has been developed for the simultaneous detection and identification of the major RNA viruses that infect grapevines (Grapevine fanleaf virus, Arabis mosaic virus, Grapevine leafroll-associated virus 1, Grapevine leafroll-associated virus 3 and Grapevine fleck virus). Serial dilutions of infected plant extracts were tested using the new method, and the results were compared with those obtained using a commercially available ELISA and real-time singleplex RT-PCR. The two real-time RT-PCR versions detected up to the same level of dilution and were at least 10,000 times more sensitive than the ELISA. In addition, 158 grapevine plants collected in a survey of the Protected Designation of Origin in Alicante, Spain were compared using the three methods. The results of the molecular methods were very similar, with only four discordant results, and both were able to detect many more infected plants than the ELISA. The high prevalence of Grapevine fleck virus, Grapevine leafroll-associated virus 3 and Grapevine fanleaf virus suggests that the main pathways of viral introduction are infected plant material that has escaped controls and/or uncontrolled traffic of propagating plant material. Real-time multiplex RT-PCR could be used to facilitate a better control of grapevine viruses.
Phytochemistry | 1997
J. Alberto Marco; Juan F. Sanz-Cervera; Alberto Yuste
The latex of Euphorbia canariensis yielded, in addition to five known ingenol esters, the ingenane derivatives ingenol 3-angelate 5,20-diacetate and 5-deoxyingenol 3-angelate 20-acetate, and the lathyrane derivatives 2,3-diepiingol 7,12-diacetate 8-benzoate, 2,3-diepiingol 7,12-diacetate 8-isobutyrate and 2-epiingol 3,7,12-triacetate 8-benzoate. The structures were established with the aid of spectroscopic methods, mainly NMR, and molecular mechanics calculations. They were also supported by the results of some chemical transformations.
Phytochemistry | 1991
J. Alberto Marco; Juan F. Sanz; Alberto Yuste; Miguel Carda; J. Jakupovic
Abstract Extraction of aerial parts of Artemisia barrelieri and chromatographic separation yielded a new germacranolide, two new monocyclic sesquiterpenes and a novel germacranolide dimer, together with several known compounds.
European Journal of Plant Pathology | 2010
Edson Bertolini; Julio García; Alberto Yuste; Antonio Olmos
Table grapes from one of the most important growing area in Spain (Vinalopó, Alicante) protected by the Designation of Origin “Vinalopó bagged table grape”, were surveyed and analysed to determine the prevalence of the five viruses included in the Spanish certification program: Arabis mosaic virus (ArMV), Grapevine fanleaf virus (GFLV), Grapevine fleck virus (GFkV), Grapevine leafroll associated virus-1 (GLRaV-1) and Grapevine leafroll associated virus-3 (GLRaV-3). Ninety five sampling points were selected and the position of grapevine plants georeferenced. Samples were collected in two different vegetative periods and analyses were performed by ELISA and real-time RT-PCR. Purified RNA and immobilized viral targets from plant extracts on nylon membranes were used in parallel assays as templates for PCR assays. In order to analyse these five viral species by real-time RT-PCR, new specific primers and TaqMan probes were designed for detection of ArMV and GFkV. Real time RT-PCR from purified RNA was more sensitive than spot version and ELISA tests. The most prevalent virus was GFLV (95.8%) followed by GLRaV-3 (94.7%), GLRaV-1 (66.3%) and GFkV (65.3%). ArMV was not detected in any sample. The high level of viral infections and the presence of mixed infections suggest that initial infected plant material and uncontrolled traffic of propagation material have played an important role in the spread of viruses.
Phytochemistry | 1998
J. Alberto Marco; Juan F. Sanz-Cervera; Alberto Yuste; J. Jakupovic; F. Jeske
Abstract The aerial parts of Euphorbia terracina yielded 11 new jatrophane derivatives as well as a further diterpene displaying the novel 1(15 → 14) abeo -jatrophane framework.
Phytochemistry | 1994
J. Alberto Marco; Juan F. Sanz-Cervera; Alberto Yuste; M.Carmen Oriola
Abstract The aerial parts of two Andryala species yielded several guaianolides and guaianolide glycosides, three of them being new. The aerial parts of Urospermum dalechampii yielded several known germacranolides and the new dihydroflavonol 3- O -methyltaxifolin.
Phytochemistry | 1997
J. Alberto Marco; Juan F. Sanz-Cervera; Alberto Yuste; J. Jakupovic
Abstract The aerial parts of Euphorbia terracina yielded five new bishomoditerpene lactones, named terracinolides C-G, which display the novel C 22 17-ethyljatrophane framework.
Journal of Pharmacy and Pharmacology | 1998
Francisco J. Miranda; José A. Alabadí; Marta Ortí; José M. Centeno; Marta Piñón; Alberto Yuste; Juan F. Sanz-Cervera; J. Alberto Marco; Enrique Alborch
We have analysed the effects of 2,3‐diepiingol 7,12‐diacetate‐8‐isobutyrate (compound 1), ingenol‐3‐angelate‐17‐benzoate (compound 2), ingenol‐3‐angelate‐17‐benzoate‐20‐acetate (compound 3) and 3,5,7,8,9,15‐hexahydroxyjatropha‐6(17),11‐dien‐14‐one‐5,8‐bis(2‐methylbutyrate)‐7‐(2‐methylpropionate) (compound 4), four diterpenes isolated from E. canariensis, on the isometric tension developed by isolated rabbit basilar and carotid arteries.
Tetrahedron Letters | 1991
J. Alberto Marco; Juan F. Sanz; Alberto Yuste; J. Jakupovic
Abstract The novel germacronolide-valine adduct dimer 1 has been isolated from aerial parts of Centaurea aspera var. aspera . Its structure has been determined by spectroscopic methods.
Journal of Pharmacy and Pharmacology | 1997
Francisco J. Miranda; José A. Alabadí; Pedro Pérez; Marta Ortí; José M. Centeno; Alberto Yuste; Juan F. Sanz-Cervera; J. Alberto Marco; Enrique Alborch
We have analysed the effects of 7,12‐O‐diacetyl‐8‐O‐benzoil‐2,3‐diepiingol (DBI), an ingol derivative isolated from E. canariensis, on isometric tension developed by isolated rabbit basilar and carotid arteries.