Yeast derivatives: a promising alternative for white wine oxidation prevention

In the previous decade, the use of Yeast Derivatives (YD) was proposed as a new strategy to control wine oxidation (Comuzzo et al., 2015). These products are obtained from yeasts by autolytic or hydrolytic processes and then dried to obtain the commercial products. The aim of this work was to carry out a preliminary investigation of commercial YDs with different compositions in order to (i) compare their capacity to prevent white wine oxidation in comparison with conventional treatment using SO2, and (ii) evaluate their impact on wine quality

Les fonds anciens des Archives communales aujourd'hui

Die alten Bestânde der Gemeindearchive. Im Verfolge einer an die Gemeindearchive betreffs ihrer alten Bestände gerichteten Umfrage zieht der Artikel zunächst die Bilanz aus den Antworten. Letztere sind zum grössten Teil negativ und bezeugen von Seiten sowohl der für die Gemeindearchive verantwortlichen Personen, als auch der Benutzer, einen äusserst starken Interesse-mangel an diesen Beständen. Es gibt zahlreiche Gründe für dieses schwindende Interesse : die Archive werden meistens von Bibliothekaren verwaltet ; man sieht in den Verantwortlichen keine Historiker, sondern Dokumentare ; die Findbehelfe sind nicht angepasst ; es fehlt den Gemeindearchivaren an Fachbildung oder an Mitteln, um sich an die Ordnung der alten Bestände heranzuwagen oder sie wieder aufzugreifen. Einige ausfuhrlicher dargestellte Einzelfälle zeigen indessen Gemeindearchivare, die in ihrer Rolle als Hüter des geschichtlichen Erbes eine bemerkenswerte Tätigkeit entfalten, in : Blois, Marseille, Nizza, Pau, Poitiers, Strassburg und Troyes. Diese ailes in allem unausgeglichene Lage lädt zum Nachdenken liber eine demnächstige weitergespannte Umfrage zu diesem Thema ein.Historical documents in municipal archives. This article is the result of a questionnaire circulated among French Municipal Archives about their keepings older than 1789 (" fonds anciens "). The answers were mainly negative, stating an extreme disinterest for these documents, both from persons responsible of municipal archives and from users. There are various reasons for this disinterest : many municipal archives are managed not by archivists, but by librarians ; many of these are more documentalists than historians ; few archives have adequate finding aids ; many municipal archivists lack specialized training and adequate means to deal with the processing of old documents. Nevertheless, in some cases there are municipal archivists who play actively their role of keepers of historical heritage, for instance at Blois, Marseille, Nice, Pau, Poitiers, Strasbourg, Troyes. This unbalanced situation should induce us to a more detailed study on the subject.Documentos histôricos en los archivos municipales. El articulo es el compendio de las respuestas a un cuestionario enviado a los archi-veros municipales de Francia relativo a sus documentos anteriores a 1789 («Fonds anciens »). Las respuestas fueron en mayor parte negativas, reflejando una considérable falta de interés para estos documentas, de parte de los responsables de los archivos y de los usuarios. Varias causas pueden descubrirse : muchos archivos municipales son administrados no por archiveras, sino por bibliotecarios ; muchos de ellos son mas documentalistas que historiadores ; pocos archivos municipales tienen instrumentes de investigaciôn adecuados ; muchos archiveros municipales carecen una formacion especializada y recursos adecuados para el tratamiento de douementos histdricos. Sin embargo, en varios casos los archiveros municipales desempenan activamente su papel de con-servadores, del patrimonio histôrico de las ciudades por ejemplo a Blois, Marseille, Nice, Pau, Poitiers, Strasbourg, Troyes. Esta situaciôn desequilibrada necesitaria un estudio mas detallado del asunto.BIBOLET Françoise, Massot Mireille, Ramière Arnaud. Les fonds anciens des Archives communales aujourd'hui. In: La Gazette des archives, n°125-126, 1984. Les archives historiques : archives d’hier, histoire de demain. pp. 179-206

The colloidal stabilization of young red wine by Acacia senegal gum: The involvement of the protein backbone from the protein-rich arabinogalactan-proteins

The arabinogalactan-proteins (AGPs) from Acacia senegal gum are used as protective colloid in young red wines to prevent the precipitation of the coloring matter. Usually, Acacia senegal gum is chosen based on its efficiency to stabilize iron hexacyanoferrate salts in hydro-alcoholic solution. In this study, the protective activity of Acacia senegal gum and its macromolecular fractions (HIC–F1, HIC–F2 and HIC–F3), separated according to their hydrophobicity, towards the precipitation of iron hexacyanoferrate salts and polyphenols in hydro-alcoholic solutions are reported. AGPs prevent the colloidal instability of both iron hexacyanoferrate salts and polyphenols in “model” hydro-alcoholic solutions and young red wine with a good correlation between results obtained on both systems. This result strengthens the use of iron hexacyanoferrate salts (hydro-alcoholic – mineral test) for the evaluation of the protective activity of A. senegal gum in young red wine. The precipitation of iron hexacyanoferrate salts is avoided by the electrostatic binding of Ca2+, the driver of the instability, with the negatively charged carried by amino-acids from the protein backbone or both by amino acids and uronic acid monosaccharides localized close to the protein backbone of AGPs. The protective activity closely depends on the protein content of AGPs in both iron hexacyanoferrate salts and polyphenols hydro-alcoholic solutions: the more they are rich in proteins, the more their colloidal stabilizing efficiency is (HIC–F3>HIC–F2>HIC–F1). The differences observed in the protective activity between AGPs from the three HIC fractions are relied not only to their protein content but also to their related rate of glycosylation that modulates the protein accessibility to its environment, then their physicochemical properties as their hydrophobic behavior

Potential diagnostic biomarkers of Ulcerative Colitis-associated colorectal dysplasia

Biomarkers of Colorectal Dysplasi

Research on the origin and the side effects of chitosan stabilizing properties in wine

Research on the origin and the side effects of chitosan stabilizing properties in wine. Applied Natural Products : From Discoveries To Innovation

Biomarqueurs potentiels de diagnostic des dysplasies colorectales associées à la rectocolite ulcéro-hémorragique

Biomarkers of Colorectal Dysplasi

Biomarqueurs potentiels de diagnostic des dysplasies colorectales associées à la rectocolite ulcéro-hémorragique

Biomarkers of Colorectal Dysplasi