1,720,972 research outputs found
Caratterizzazione di trigliceridi di sintesi con funzione di solvente/supporto in aroma burro
No full textIl presente lavoro si inquadra nell'ambito del controllo di rispondenza alle leggi comunitarie (Direttive CE 88/388/CEE del 22.06.88 e 91/71/CEE del 16.01.91) di una serie di aromi di varia natura e destinazione. E' stato esaminato a tali fini un aroma burro caratterizzato da un non comune solvente/supporto, reperito sul mercato nazionale degli aromi. La ricerca è stata quindi estesa allo studio delle modifiche apportate alla composizione trigliceridica di un burro genuino dall'aggiunta dell'aroma stesso. Tale verifica è stata mirata all'analisi dei trigliceridi e tenendo conto dei valori di S previsit dal metodo di analisi incluso nel Regolamento CE n. 213 del 09.01.01 e destinato a valutare la rpesenza di grassi estranei nel grasso di latte
Evaluation of the colorimetric tetrazolium assay for the cytotoxicity testing a commercial vanilla flavouring
Full text linkThe tetrazolium colorimetric assay (MTT-assay) has been used to evaluate the cytotoxicity of a vanilla flavouring found on the market. It was characterised by the use of 1,2-propylene glycol and glycerol as diluents and by the presence of vanillin, heliotropine and the corresponding 1,2-propylene and glycerol acetals. The method developed by Mosmann (J. Immunol. Methods 65, 55–63-1983) was used with some modifications. The same assay was applied to the diluent 1,2-propylene glycol in order to verify its possible influence on the toxic effect. This technique proved useful for preliminary screening useful to evidence doubts relating to the safety of flavouring preparations
Criterio di caratterizzazione PCA di liquori limoncello
No full textIl lavoro descrive, attraverso alcuni esempi, il criterio statistico di caratterizzazione/classificazione di liquori "limoncello" basato sull'analisi di correlazione PCA (Principal Component Analysis) fra dati analitici GC relativi a quei terpeni da olio essenziale di limone che più sono risultati utili a tal fine. Il criterio adottato dal Laboratorio HRGC/MS/HPLC si è dimostrato utile ed effettivamente applicabile nel controllo di qualità industriale in quanto consente di classificare i liquori "limoncello" in modo univoco anche al fine di evidenziare gli effetti dello stoccaggio
Prodotti a base di carne aromatizzati con macis e noce moscata - Determinazione analitica di safrolo e safrolo-simili
No full textThe Italian law (D.L. N. 107, 25.01.1992), relating to flavourings for use in foodstuff and to source materials for their production, defines the maximum limits for certain natural substances present in flavourings, in food ingredients or in foodstuff. Safrole and isosafrole are among these substances limited by law. The present note describes an analytical method suitable for routine analyses and useful to give results characterised by high recovery. The method is optimised in operating conditions in respect to safrole and isosafrole identification
GC/MS-MID Determination of Safrole in Soft Drinks
Full text linkSafrole [1,3-benzodioxole, 5-(2-propenyl)-] is a limited substance according to the CE Directives N. 88/388 and 91/71 concerning “flavourings for use in foodstuffs and to source materials for their production”. At today the GC analytical methods proposed for the quantitative determination of safrole are critical as far as concerning reproducibility, recovery values and detection limits. This note describes an improved analytical method to quantify safrole in “soft” drinks. Average recoveries of safrole from samples spiked at levels from 30.0 to 80.0 microg/L ranged from 80 to 93% with good reproducibility (RSD=2.7 at 30.0 microg/Ll). Limits of detection (LOD) and quantification (LOQ) were 10.0 microg/L and 30.0 microg/L respectively. The proposed method is also suitable for routine analysis
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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