Explorative study of apple juice fluorescence in relation to antioxidant properties
Katarzyna Włodarska , Katarzyna Pawlak-Lemańska , Igor Khmelinskii , Ewa Sikorska
AbstractTotal fluorescence spectra (excitation-emission matrices, EEM) were recorded for a series of commercial apple juices, including clear and cloudy juices produced from concentrate, cloudy juices that were not from concentrate, and freshly squeezed juices. An exploratory study of the spectra with parallel factor analysis (PARAFAC) revealed three groups of fluorophores with different emission properties, and these properties were characterized by excitation/emission maxima at 270/315 nm, (310, 370)/455 nm, and 430/(550, 680) nm, respectively. A regression analysis of the total fluorescence spectra arranged into three-way arrays using N-way partial least squares regression methods (NPLS1 and NPLS2) and an analysis of the unfolded spectra by partial least squares methods (PLS1 and PLS2) revealed quantitative relations between the fluorescence and antioxidant properties of juices. The best models for the total phenolic contents and total antioxidant capacities were obtained by applying the NPLS1 method to the EEM. The model parameters were as follows: R2CV = 0.802, RPD = 2.3 for the total phenolic content and R2CV = 0.808 and RPD = 2.3 for the total antioxidant capacity. These results show the potential use of fluorescence spectroscopy for screening apple juices for their antioxidant properties.
|Journal series||Food Chemistry, ISSN 0308-8146, (A 40 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Apple juice, Antioxidants, Fluorescence, Parallel factor analysis, Multivariate regression|
|ASJC Classification||; ;|
|Score|| = 40.0, 05-02-2020, ArticleFromJournal|
= 40.0, 05-02-2020, ArticleFromJournal
|Publication indicators||= 8; : 2016 = 2.102; : 2016 = 4.529 (2) - 2016=4.498 (5)|
|Citation count*||25 (2020-06-12)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.