Antonio Fiz [ [Material gráfico]: Gandía (Spain) : special extra-finest oranges.

Tit. en la etiqueta: "Antonio Fiz / special extra-finest-oranges / Gandia (Spain)"

'Suntipt' [ [Material gráfico]: Spanish oranges.

Tit. en la etiqueta: "Spanish / 'Suntipt' / oranges"

Mansanet Martí [ [Material gráfico]: Tabernes oranges : finest selected.

Impreso en ángulo inferior derecho: "Antonio Mansanet / Simat de Valldigna / Valencia-España / Teleg. SIMANTON-TABERNES"

Oranges Vimont well-known [ [Material gráfico]: Consuelo García Botella vda. de Vicente Mont : Algemesí (Valencia).

Impreso en ángulo superior izquierdo: "Producido en España" y en el derecho: "R.E. 20.471"

Les boxeurs [ [Material gráfico]: la meilleure des oranges d'Espagne : Maison Borrás : Liége.

Tit. en la etiqueta: "Maison Borras / Liege / Les Boxeurs / la meilleure des oranges d'Espagne"

Optimisation of analytical methods for the characterisation of oranges, clementines and citrus hybrids cultivated in Spain on the basis of their composition in ascorbic acid, citric acid and major sugars

Three HPLC methods were optimised for the determination of citric acid, succinic acid and ascorbic acid using a photodiode array detector and fructose, glucose and sucrose using a refractive index in twenty eight citrus juices. The analysis was completed in <16 min. Two different harvests were taken into account for this study. For the season 2011, ascorbic acid content was comprised between 19.4 and 59 mg vitamin C/100 mL; meanwhile for the season 2012, the content was slightly higher for most of the samples ranging from 33.5 to 85.3 mg vitamin C/100 mL. Moreover, the citric acid content in orange juices ranged between 9.7 and 15.1 g L−1, while for clementines the content was clearly lower (i.e. from 3.5 to 8.4 g L−1). However, clementines showed the highest sucrose content with values near to 6 g/100 mL. Finally, a cluster analysis was applied to establish a classification of the citrus species.