Estimation of Ascorbic Acid in Intact Acerola (Malpighia emarginata DC) Fruit by NIRS and Chemometric Analysis

Abstract

Acerola fruit is one of the richest natural sources of ascorbic acid ever known. As a consequence, acerola fruit and its products are demanded worldwide for the production of health supplements and the development of functional products. However, the analytical determination of ascorbic acid is time-consuming and costly. In this study, we show a non-destructive, reliable, and fast method to measure the ascorbic acid content in intact acerola, using near-infrared spectroscopy (NIRS) associated with multivariate calibration methods. Models using variable selection by means of interval partial least squares (iPLS) and a genetic algorithm (GA) were tested. The best model for ascorbic acid content, based on the prediction performance, was the GA-PLS method with second derivative spectral pretreatment, with a root mean square error of cross-validation equal to 22.9 mg/100 g, root mean square error of prediction equal to 46.3 mg/100 g, ratio of prediction to deviation equal to 8.0, determination coefficient for calibration equal to 0.98 and determination coefficient for prediction equal to 0.96. The current methodology, using NIR spectroscopy and chemometrics, is a promising and rapid tool to determine the ascorbic acid content of intact acerola fruit.

Spouted‐bed drying of acerola pulp (Malpighia emarginata DC): Effects of adding milk and milk protein on process performance and characterization of dried fruit powders

“…The AA contents for chosen samples (AMP and ALIO) and acerola pulp in natura (AP) are presented in Table . The AA concentrations found in the present study are superior to those reported by Nóbrega, Oliveira, Genovese, and Correia (), between 406.0 and 765.3 mg AA/100 g DW for hot air dried acerola residue, and similar to the results presented by Moraes et al () that characterized fresh acerola fruit (1,190.65–2,187.06 mg AA/100 g FW). AP presented the highest concentrations ( p < .05) of AA (AP = 4,715.31 ± 107.98 mg AA/100 g DW), and even freeze drying process had a negative effect ( p < .05) on AA concentration (ALIO = 2,734.99 ± 59.28 mg AA/100 g DW).…”

Characterization of Buritirana (Mauritiella armata) Fruits from the Brazilian Cerrado: Biometric and Physicochemical Attributes, Chemical Composition and Antioxidant and Antibacterial Potential

“…Buritirana fractions were revealed to be a great source of vitamin C compared to several Brazilian tropical fruits [ 34 ]. Additionally, the vitamin C in the peel of buritirana represents about 12% of the vitamin C content of acerola ( Malpighia emarginata ), which after camu-camu ( Myrciaria dubia ), is considered one of the fruits with the highest concentration of vitamin C among Brazilian tropical fruits [ 35 , 36 ].…”

Bibliometrics and Visual Analysis of Non-Destructive Testing Technology for Fruit Quality

“…It is important to note that machine vision technology [51] began to be used for the inspection of the external quality of fruits in 1998. In the stable stage, most studies applied e-nose [52], diffuse reflection [53], and near-infrared spectra [54] technologies. Machine vision technology [55] was further developed.…”