Effect of Ascophyllum nodosum seaweed extract on post-harvest 'Tommy Atkins’ mangoes

Abstract

-The aim of this study was to determine the effect of Ascophyllum nodosum extract (AN), applied in different doses on the physicochemical characteristics of post-harvest 'Tommy Atkins' mangoes. The selected mango fruits were treated with different extract concentrations (0%, 0.1%, 0.3%, 0.5% and 1.0%) and stored for 12 days at 25±2 °C and 75±5% RH. Every 3 days, fruit mass loss (PM), color angle (Hue) (AH), firmness, pH, titratable acidity (AT), content of total soluble solids in pulp (°Brix) and content of carbohydrates in shell were assessed. The experiments were carried out in CRD in a 5 x 5 factorial arrangement (concentrations x days of storage) with four replications. AN was effective in preventing PM, with a reduction of up to 40.2%, as observed at concentration 0.1% compared to control. There were no differences among concentrations on AH, however, all of them differed significantly from control with higher AH, especially on the 12 nd day. Fruit firmness was lower in control, the pH increased with the storage time and AT decreased. For all these parameters, mangoes treated with the extract differed from control. The pulp sample °Brix increased with the storage time as well as the content of reducing sugars, with consequent reduction of non-reducing sugars in fruit shell. These tests indicate the possibility of using AN as an alternative management in preserving mangoes in the post-harvest stage. Index Terms: Mangifera indica, fruit preservation, shelf life. Efeito do extrato da alga marinha

Effects of brown seaweed extract, silicon, and selenium on fruit quality and yield of tomato under different substrates

“…We found that the usage of seaweed extract, Si, or Se, significantly increased TTA contents and pH in tomato fruits in comparison with the control treatment, whereas the highest TTA contents and pH belonged to plants treated with the seaweed extract (10%). This study confirmed earlier reports that the application of seaweed extract, Si, and Se led to enhancements in the TTA and pH in different plants such as strawberries [ 36 ] and mango [ 47 ]. It was demonstrated that the usage of seaweed extract stimulated the biosynthesis of organic acids in a differentiated way and decelerated the natural process of senescence of different fruits, since the decline in fruit acidity was almost associated with the utilization of acids in the respiratory process, due to the process of maturation and fruit ripening [ 47 ].…”

“…This study confirmed earlier reports that the application of seaweed extract, Si, and Se led to enhancements in the TTA and pH in different plants such as strawberries [ 36 ] and mango [ 47 ]. It was demonstrated that the usage of seaweed extract stimulated the biosynthesis of organic acids in a differentiated way and decelerated the natural process of senescence of different fruits, since the decline in fruit acidity was almost associated with the utilization of acids in the respiratory process, due to the process of maturation and fruit ripening [ 47 ]. Consistent with the current results, Karagiannis et al [ 48 ] showed the increase of titratable acidity after Si foliar application due to the influence of Si on the decrease of ethylene production and respiration.…”