Ascorbic acid degradation in aqueous solution during UV-Vis irradiation.

This work studied the effect of multi-wavelength UV processing on the ascorbic acid content of aqueous solutions, at different pH values (3, 4, and 5). The source of radiation was a mid-pressure mercury lamp (460 W), emitting between 250 and 740 nm. The samples were treated for 60 min, at 25 °C and 45 °C, with the lamp on and with the lamp off.

Maize seed coatings and seedling sprayings with chitosan and hydrogen peroxide: their influence on some phenological and biochemical behaviors.

Objective: To evaluate the effect of chitosan (CH) and hydrogen peroxide (H(2)O(2)) seed coatings and seedling sprinklings on two different maize varieties by measuring their phenology, the H(2)O(2) presence, the catalase (CAT) activity, and the protein quantity.

Methods: Seven groups of ten seeds for each maize variety were treated with CH (2% (20 g/L) and 0.2% (2 g/L)) or H(2)O(2) (8 mmol/L) by coating, sprinkling, or both.