1,721,061 research outputs found
Nuovi approcci alla valutazione di qualità e autenticità
No full textIl volume copre l'intera filiera: dalle caratteristiche compositive alla qualità dell'olio, in relazione alle variabili agronomiche e tecnologiche di produzione, alla valorizzazione dei co-prodotti d'estrazione, in un'ottica di economia circolare, fino agli aspetti normativi relativi alla commercializzazione. Vengono inoltre esaminate le più moderne metodiche analitiche sia per indagare la caratterizzazione e l'origine geografica degli oli sia per approfondire gli aspetti relativi alle fonti di contaminazione e di sicurezza alimentare. Largo spazio trovano inoltre le innovazioni di processo nel settore dell'estrazione meccanica degli oli vergini di oliva. Un capitolo è completamente dedicato al rapporto tra consumo di olio d'oliva e salute
Field-Deployable Determinations of Peroxide Index and Total Phenolic Content in Olive Oil Using a Promising Portable Sensor System
Full text linkUseful information about the oxidative stability of a virgin olive oil in terms of oxidation products and antioxidant compounds can be obtained by analyzing the peroxide index (PI) and total phenolic content (TPC), respectively. These quality parameters are usually determined in a chemical laboratory using expensive equipment, toxic solvents, and well-trained personnel. This paper presents a novel portable sensor system for in the field and rapid determination of PI and TPC that is particularly suited in the case of small production environments that cannot afford an internal laboratory for quality control analysis. The system is small, can be powered by both USB ports and batteries, is easy to operate, and integrates a Bluetooth module for wireless data transmission. It estimates the PI and TPC in olive oil from the measurement of the optical attenuation of an emulsion between a reagent and the sample under test. The system has been tested on a set of 12 olive oil samples (eight for calibration and four for validation), and the results have shown how the considered parameters can be estimated with good accuracy. The maximum deviation from the results obtained with the reference analytical techniques is 4.7 meq O-2/kg in the case of PI and 45.3 ppm in the case of TPC for the calibration set, while it is 14.8 meq O-2/kg in the case of PI and 55 ppm in the case of TPC for the validation set
Metabolic fingerprinting strategies for authentication challenge: EVOO adulterated by soft deodorized olive oil
No full textComposition of cold-pressed hemp seed oils: key elements of quality and authenticity
No full textWith the promotion of the agro-industrial chain of Cannabis sativa L., the presence on the market of food products obtained from industrial hemp has become more frequent and relevant. Among these, it is important to mention cold-pressed hemp seed oil, which, in relation to specific sensory quality and nutritional characteristics, is certainly one of the most widespread. In order to guarantee consumers regarding its safety, quality and authenticity, it is essential to know the key compositional parameters, their variability and the analytical methods that can be used to detect them. In this review article, all the evidence from the literature, useful to define a quality regulatory framework for the product category “cold-pressed hemp oil” according to the basic criteria of the Codex Alimentarius and some related considerations such as the seed conservation methods, the fundamental variables of the production process and the safety of the edible oil obtained, this last in relation to the legal limit (7.5 mg/kg), expressed as the sum of Δ9 – tetrahydrocannabinol (acid plus neutral form), are discussed. Nowadays, apart this last legal obligation, there is no specific and harmonized EU legislation to define the quality and authenticity of cold-pressed hemp seed oil. In order to help achieve this
objective, this review presents a discussion of the data from the literature and provides interpretative elements. The path and information described herein were keys in drafting the commercial standard entitled “Cold-pressed hemp oil obtained from Cannabis sativa L. seeds - Characteristics and methods of analysis” UNI-11876:2022
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
A sustainable approach for the valorisation of a tomato by-product: green techniques for lycopene extraction
No full textCharacterization of a Novel Oil obtained through the Co-milling of Olives and Hemp Seeds
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