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Université de Neuchâtel

Analytical methods for the determination of the geographic origin of Emmentaler cheese. Main framework of the project; chemical, biochemical, microbiological, colour and sensory analyses

Pillonel, L. ; Badertscher, R. ; Bütikofer, U. ; Casey, M. ; Dalla Torre, M. ; Lavanchy, P. ; Meyer, J. ; Tabacchi, Raphael ; Bosset, Jacques-Olivier

In: European Food Research and Technology, 2002, vol. 215, no. 3, p. 260-267

Emmentaler is a hard cheese produced and consumed in many countries. The authenticity of this cheese variety is becoming a matter of national importance with the imminent opening of the cheese market in Switzerland and the introduction of the PDO label for the Emmentaler Switzerland™. This paper is the first in a series reporting the search for parameters that make possible a geographic...

Université de Neuchâtel

Asymmetric Synthesis of the cis- and trans-3,4-Dihydro-2,4,8-trihydroxynaphthalen-1(2H)-ones

Couché, Emmanuel ; Fkyerat, Abdellatif ; Tabacchi, Raphael

In: Helvetica Chimica Acta, 2003, vol. 86, no. 1, p. 210-221

A short and efficient protocol for the asymmetric synthesis of cis- and trans-3,4-dihydro-2,4,8-trihydroxynaphthalen-1(2H)-one (1 and 2, resp.) is described, with a phthalide annulation as the key step. Introduction of a OH substituent at position 2 was performed by Sharpless dihydroxylation of a silyl enol ether or by means of an...

Université de Neuchâtel

Bafoudiosbulbins A, and B, two anti-salmonellal clerodane diterpenoids from Dioscorea bulbifera L. var sativa

Teponno, Rémy Bertrand ; Tapondjou, Azefack Léon ; Gatsing, Donatien ; Djoukeng, Jules Désiré ; Abou-Mansour, Eliane ; Tabacchi, Raphael ; Tane, Pierre ; Stoeckli-Evans, Helen ; Lontsi, David

In: Phytochemistry, 2006, vol. 67, no. 17, p. 1957-1963

Two clerodane diterpenoids, Bafoudiosbulbins A 1, and B 2, together with five known compounds: tetracosanoic acid, 1-(tetracosanoyl)-glycerol, trans-tetracosanylferulate, β-sitosterol and 3-O-β-d-glucopyranosyl-β-sitosterol were isolated from the tubers of Dioscorea bulbifera L. var sativa. Their structures were established by spectroscopic methods (1D and 2D-NMR,...

Université de Neuchâtel

Data transferability between two MS-based electronic noses using processed cheeses and evaporated milk as reference materials

Pillonel, Laurent ; Bosset, Jacques-Olivier ; Tabacchi, Raphael

In: European Food Research and Technology, 2002, vol. 214, no. 2, p. 160-162

Electronic noses produce data which are difficult to transfer between identical instruments because of differences in the characteristics of "identical" instruments and because of sensor drift. The transportability of data is, however, essential for the setting up of databanks. Results of the present investigation, using processed cheeses and evaporated milk as reference materials, show that data...

Université de Neuchâtel

Gas Chromatographic Enantiomer Separation of Atropisomeric PCBs Using Modified Cyclodextrins as Chiral Phases

Magnusson, J. ; Blomberg, L. G. ; Claude, Saturnin ; Tabacchi, Raphael ; Saxer, A. ; Schürch, S.

In: Journal of High Resolution Chromatography, 2000, vol. 23, no. 11, p. 619-627

Columns containing different types of cyclodextrin derivatives have been evaluated for chiral gas chromatographic separation of atropisomeric PCBs, o,p´-DDT and o,p´-DDD. Separation was attempted on columns containing mixed chiral selectors, and the performance of two closely related selectors was also examined. The cyclodextrins were: permethylated- β -CD (PM- β -CD),...

Université de Neuchâtel

Geographic origin of European Emmental cheese: Characterisation and descriptive statistics

Pillonel, Laurent ; Badertscher, R. ; Casey, M. ; Meyer, J. ; Rossmann, A. ; Schlichtherle-Cerny, H. ; Tabacchi, Raphael ; Bosset, Jacques-Olivier

In: International Dairy Journal, 2005, vol. 15, no. 6-9, p. 547-556

To survey the authenticity of Emmental cheese from some of the main European countries of origin, samples of cheeses manufactured during winter (110 samples) and summer (73 samples) were collected. From a preliminary study, a series of promising analytical methods were selected and applied: total nitrogen, water soluble nitrogen (WSN), 12% TCA soluble nitrogen (TCA-SN), pH-value, volatile...

Université de Neuchâtel

Geographic origin of European Emmental. Use of discriminant analysis and artificial neural network for classification purposes

Pillonel, Laurent ; Bütikofer, U. ; Schlichtherle-Cerny, H. ; Tabacchi, Raphael ; Bosset, Jacques-Olivier

In: International Dairy Journal, 2005, vol. 15, no. 6-9, p. 557-562

The goal of this work was to classify European Emmental cheeses according to their geographic origin using analytical approaches. Twenty-five analytical parameters (factors) were measured in 183 samples. Results were combined by multivariate statistical analysis. Discriminant analysis (DA) and an artificial neural network (ANN) delivered similar results when all regions and factors were included;...

Université de Neuchâtel

Isoflavonoid exudation from white lupin roots is influenced by phosphate supply, root type and cluster-root stage

Weisskopf, Laure ; Tomasi, Nicola ; Santelia, Diana ; Martinoia, Enrico ; Langlade, Nicolas Bernard ; Tabacchi, Raphael ; Abou-Mansour, Eliane

In: New Phytologist, 2006, vol. 171, no. 3, p. 657-668

• The internal concentration of isoflavonoids in white lupin (Lupinus albus) cluster roots and the exudation of isoflavonoids by these roots were investigated with respect to the effects of phosphorus (P) supply, root type and cluster-root developmental stage. • To identify and quantify the major isoflavonoids exuded by white lupin roots, we used high-pressure liquid...

Université de Neuchâtel

Lichen extracts as raw materials in perfumery. Part 1: oakmoss

Joulain, Daniel ; Tabacchi, Raphael

In: Flavour and Fragrance Journal, 2009, vol. 24, no. 2, p. 49-61

A comprehensive review is presented on extracts of a lichen, oakmoss (Evernia prunastri), that are used in the fragrance industry. Analytical aspects are discussed in detail, from both qualitative and quantitative standpoints, mainly in relation to the industrial processing of the lichen. It is shown that more than 170 constituents have been identified so far in oakmoss extracts, including...

Université de Neuchâtel

Lichen extracts as raw materials in perfumery. Part 2: treemoss

Joulain, Daniel ; Tabacchi, Raphael

In: Flavour and Fragrance Journal, 2009, vol. 24, no. 3, p. 105-116

This is a comprehensive review of extracts from the lichen Pseudevernia furfuracea (treemoss) that are used in the fragrance industry. Qualitative and quantitative analytical aspects are critically reviewed and the results are compared to those of the related oakmoss extracts. It is shown that more than 90 constituents have been identified so far in treemoss extracts, including 42...