Effect of process variables on the osmotic dehydration of star-fruit slices

The objective of this work was to study the effect of blanching and the influence of temperature, solution concentration, and the initial fruit:solution ratio on the osmotic dehydration of star-fruit slices. For blanching, different concentrations of citric and ascorbic acids were studied. The samples immersed in 0.75% citric acid presented little variation in color in relation to the fresh star-fruit. Osmotic dehydration was carried out in an incubator with orbital shaking, controlled temperature, and constant shaking at 120 rpm. The influence of process variables was studied in trials defined by a complete 23 central composite design. In general, water loss and solids gain were positively influenced by temperature and by solution concentration. Nevertheless, lower temperatures reduced water loss throughout the osmotic dehydration process. An increase in the amount of dehydrating solution (initial fruit:solution ratio) slightly influenced the evaluated responses. The process carried out at 50 ºC with a solution concentration of 50% resulted in a product with lower solids gain and greater water loss. Under these conditions, blanching minimized the effect of the osmotic treatment on star-fruit browning, and therefore the blanched fruits showed little variation in color in relation to the fresh fruit.

The effect of different concentrations of pre-harvest gibberellic acid on the quality and durability of ‘Obilnaja’ and ‘Black Star’ plum varieties

Abstract The research work aimed at investigating the effect of pre-harvest gibberellic acid (GA3) treatment on the quality of ‘Obilnaja’ and ‘Black Star’ Japanese plum varieties. GA3 was sprayed onto the trees during the fruit color break at 0, 25, 50, 75, and 100 ppm concentrations. After pre-cooling, the plums were placed in modified atmosphere packages and exposed to the following conditions as follows: short storage-transportation (ST) [20 days at 2 °C and 90% relative humidity (RH)]; distribution center (DC) (5 days at 6 °C and 80% RH), and shelf life conditions (SL) (2 days at 20 °C and 70% RH). Pre-harvest GA3 treatments increased the fruit weight and size. Treatment of GA3 at 50, 75, and 100 ppm increased the fruit flesh firmness and total soluble substances (TSS) values in both the plum varieties during storage, transport, and marketing; it also limited the weight loss during the marketing process. Treatment of GA3 had no significant effects on the color, titratable acidity (TA), and the total phenolic and antioxidant activity values of plums. Pre-harvest GA3 treatment at 50 ppm GA3 can be thus recommended for both the plum varieties due to its effect on the fruit quality.

7/3/20, Stade Bergeyre, [football] association, équipe du Red Star : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 58360

2/5/20, [stade Bergeyre], championnat de Paris, [football] association, Red Star contre R.C.F. [Racing Club de France] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59140

2/5/20, [stade Bergeyre], championnat de Paris, [football] association, Red Star contre R.C.F. [Racing Club de France] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59141

2/5/20, [stade Bergeyre], championnat de Paris, [football] association, Red Star contre R.C.F. [Racing Club de France] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59143

2/5/20, [stade Bergeyre], championnat de Paris, [football] association, Red Star contre R.C.F. [Racing Club de France] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59144

2/5/20, [stade Bergeyre], championnat de Paris, [football] association, équipe [du] Red Star : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59147

2/5/20, [stade Bergeyre], championnat de Paris, [football] association, équipe [du] Red Star : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59148

Red Star, stade Bergeyre, 23/5/20 [équipe de football] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59386

13/5/20, [football] association, Saint-Ouen, équipe du Red Star club : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59263