EFFECT OF NPK FERTILIZATION ON THE CHEMICAL PROPERTIES AND BIOACTIVE COMPOUNDS IN CABEZONA PINEAPPLE FRUITS Pineapple quality
Main Article Content
Keywords
Big-headed pineapple, NPK fertilization, Chemical properties, Bioactive compounds
Abstract
ABSTRAC
Objective: To evaluate the effect of NPK fertilization on the chemical properties and bioactive compounds of the big-headed pineapple fruit.
Design/methodology/approach: 15 NPK fertilization treatments were evaluated and established in the field in a Random Complete Block design with four repetitions per treatment. At the end of the crop cycle, the obtained fruits were determined pH, °Brix and % citric acid, following the methodology established by NMX-FF-028 and 011 respectively. The pH was measured directly to the juice with a potentiometer. Ascorbic acid with a kit to determine ascorbic acid from the SIGMA-ALDRICH® brand, the concentrations of total polyphenols were also determined following the methodology of De la Cruz et al. (2018) and those of total flavonoids following the methodology of Hossain et al. (2011) with modifications.
Results: The average values for °Brix, % citric acid and pH were 7.3, 7.1 and 3.4 respectively, without significant differences between treatments. In the concentration of ascorbic acid, a highly significant difference was observed between treatments, with treatment three having the highest concentration (19.4 mg 100 g-1 FF). The concentrations of total polyphenols (41.34 mg 100 g-1 FF) and flavonoids (1.6 mg 100 g-1 FF) did not show significant differences between the fertilization treatments and the control.
Study limitations/implications: The degree of maturity of the pineapple fruit directly influences the chemical properties and concentration of bioactive compounds.
Findings/conclusions: NPK fertilization had no effect on °Brix and pH. The percentage of citric acid and the concentration of total polyphenols increase as the doses of P2O5 are increased. The concentration of ascorbic acid and total flavonoids is not affected by NPK fertilization dose.
Keywords: Big-headed pineapple, NPK fertilization, Chemical properties, Bioactive compounds.