1,721,108 research outputs found
Ideabrill packaging capability in the preservation of raw and cooked ham. a comparative study
No full textABSTRACT: IDEABRILL PACKAGING CAPABILITY IN PRESERVATION ON RAW AND COOKED HAM. A COMPARATIVE STUDY.
Food packaging contributes to the preservation and shelf-life of food. In literature, several studies demonstrate that active packaging, enriched of bioactive compounds like the essential oil of Rosmarinus Officinalis [1], and modified atmosphere packaging, can positively affect the preservation of food. The study of new types of packaging is continuously increasing, especially in terms of environmental impact and food preservation. In this study, three types of packaging provided by Esseoquattro company were tested, in order to assess their capability in the preservation of food. Ideabrill® packaging, a three layers pack of polyethylene high density layer, metallic layer and cellulose with long fiber layer, combined with Ideabrill® sacchetto salvafreschezza was compared to paper coupled with wings alone and combined with Ideabrill® sacchetto salvafreschezza. The study was conducted on raw and cooked ham preserved in the packaging described above through the quantification of biogenic amines (BAs) at day 0, 3, 5 and 7. BAs can be considered markers to evaluate the freshness and the quality of food. In particular, a higher concentration of BAs is related to a higher deterioration degree of food. BAs were extracted, derivatized with dansyl chloride, purified with a SPE C-18 and then analyzed with an HPLC-DAD method. This study, in combination with microbiological study, shows that Ideabrill® packaging combined with Ideabrill® sacchetto salvafreschezza displayed the best conservation capability for raw and cooked ham when compared with others. Moreover, from an eco-friendly point of view, Ideabrill® packaging layers can be easily separated in order to encourage recycling.
[1] Sirocchi, V., Caprioli, G., Cecchini, C., Coman, M. M., Cresci, A., Maggi, F., ... & Sagratini, G. (2013). Biogenic amines as freshness index of meat wrapped in a new active packaging system formulated with essential oils of Rosmarinus officinalis. International journal of food sciences and nutrition, 64(8), 921-928
Bioactive compounds in lentils and nutraceutical effects
No full textLentils are an endemic crop of central Italy in particular of Umbro-Marchean Apennines and some of these are recognized by the European Union with the acronym PGI, Protected Geographical Indication. Among pulses, lentils have high nutritional value and they are an important sources of bioactive compounds: besides nutrients such as PUFA (regulation of cognitive function, cardiovascular diseases prevention) there are important nutraceutical compounds such as soyasaponins (hypocholesterolemic, antiepatotoxic and anticarcinogenic activity) and isoflavones (osteoporosis prevention, ameloriation postmenopausal symptoms, tumor initiation prevention). In our labs, several methods to determine the above compounds have been validated and applied to lentils and other legumes using HPLC-MS, UHPLC-MS/MS, GC-FID systems. Furthermore, some in vivo and in vitro biological studies have been performed, such as anti-hypercholesterolemic effect on a rat model with diet induced hypercholesterolemia. Additionally, toxic effect of soyasaponins and lentil extracts have been studied in vitro on caco-2 cells.
Results showed that soyasaponins I and βg are present in lentils in concentrations ranging from 541 to 1457 mg kg−1. The isoflavone content in lentils ranged from 0.41 to 58.61 μg kg-1. Unsaturated fatty acids are predominant in lentils with respect to saturated fatty acids. Soyasaponin I and lentil extracts no cytotoxic effect produced in Caco-2 cells at the tested concentrations. Lentils are an important source of bioactive compounds and lentils extracts may have a nutraceutical effect.
References
1Vila-Donat, P.; Caprioli, G.; Conti, P.; Maggi, F.; Ricciutelli, M.; Torregiani E.; Vittori, S.; Sagratini, G., Food Anal. Meth., 2013, DOI 10.1007/s12161-013-9708-3. 2Vila-Donat, P., Caprioli, G., Maggi, F., Ricciutelli, M., Torregiani, E., Vittori, S., Sagratini, G., Food Chem., submitted. 3Folch, J., Lees, M., Sloane Stanley, G. H. (1956). J. Biol. Chem., 1956, 226, 497-509
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
total parathyroidectomy without autotransplantation: the third option in surgical treatment of secondary hyperparathyroidism of the uremic patients
No full textEffect of the ultrasound-assisted extraction parameters on the determination of ergosterol and vitamin D2 in Agaricus bisporus, A. bisporus Portobello, and Pleurotus ostreatus mushrooms
No full textErgosterol is an important secondary metabolite precursor of vitamin D2 in mushrooms and is responsible for
various health-promoting effects. The increasing interest in searching and analyzing foods rich in provitamin and
vitamin D requires the optimization of a fast and effective extraction method. The comprehensive optimization of
the parameters influencing ultrasound-assisted extraction (U.A.E) was performed to determine the best U.A.E
conditions for ergosterol and vitamin D in mushrooms. The highest extraction yields were obtained with ethanol
as solvent, 20 mg/mL as the solid-solvent ratio (SSR), at a frequency of 40 kHz, and a power of 240 W, for 30 min
at 40 ◦C. For conjugated ergosterol, U.A.E in basic conditions (pH 11 using an ethanolic solution of KOH) at
60 ◦C for 30 min was ideal. Moreover, saponification after U.A.E did not provide any improvement on the
extraction yield. The developed U.A.E. methods were applied on three mushroom species obtaining high levels of
total ergosterol for Agaricus bisporus (6.8 ± 0.1 mg/g dw), A. bisporus Portobello (7.3 ± 0.2 mg/g dw), and
Pleurotus ostreatus (4.9 ± 0.1 mg/g dw). Moreover, good levels of vitamin D2 (13.9–19.2 mg/100 g dw) in
mushrooms were obtained after ultraviolet-C (UV-C) irradiation
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
