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Detector elettrochimico ECD (Coularray®): applicazione nel settore enologico per la determinazione di sostanze antiossidanti
No full textOrganic acids profile in tomato juice by HPLC with UV detection
No full textA simple method was developed to determine 10 organic acids simultaneously
in tomato products using reverse-phase high performance liquid chromatography
(HPLC) column with the diode array detector set at 210 nm. After
centrifugation and filtration, the samples were passed through to an anion
exchange resin and the organic acids were released using 0.1 N HCl. The
chromatographic separation was achieved with isocratic analysis in a 20-min
run. The method was reliable and sensitive. The coefficient of determination of
the standard calibration curve is 0.9925 r2 0.9999 and the limit of detection
ranged from 0.08 to 6.00 mg/kg for trans-aconitic acid and acetic acid,
respectively. The limit of quantification ranged from 0.19 to 15.18 mg/kg for
trans-aconitic and acetic acid, respectively. To establish the efficiency of the
anion resin the procedure was applied to a standard solution of a mixture of
organic acids. The organic acids recovery ranged from 87.0% 1.9 for citramalic
acid to 109.9% 5.2 for fumaric acid
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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