Classification of Different Blueberry Cultivars by Analysis of Physical Factors, Chemical and Nutritional Ingredients, and Antioxidant Capacities

Juan Song,Qiong Shi,Lu Xu,Si-Min Yan,Si-Zhan Wu,Hai-Yan Fu

doi:10.1155/2020/9474158

Abstract

Blueberry fruits of different cultivars are featured with different quality indices. In this work, three types of quality factors, including 6 physical parameters, 12 chemical and nutritional components, and 3 antioxidant indices, were measured to compare and classify blueberry fruits from 12 different cultivars in China. Using the autoscaled data of quality factors, unsupervised principal component analysis was performed for exploratory analysis of intercultivar differences and the influences of quality factors. A supervised classification method, partial least squares discriminant analysis (PLSDA), was combined with the global particle swarm optimization algorithm (PSO) and two multiclass strategies, one-versus-rest (OVR) and one-versus-one (OVO), to select discriminative quality factors and develop classification models of the 12 cultivars. As a result, OVO-PLSDA with 8 quality factors could achieve the classification accuracy of 0.915. This study will provide new insights into the quality variations and key factors among different blueberry cultivars.

Highlights

IntroductionA native American cultivar, has been widely cultivated around the world [1]
Blueberry, a native American cultivar, has been widely cultivated around the world [1]
Projection of the 12 classes onto the first 2 principal components (PCs) showed the variations among different cultivars of blueberries. e loadings of the first PC (Figure 1) indicated that the levels of 1 physical parameter and 5 chemical and nutritional components contribute significantly to the class separation achieved by PC1

Summary

Introduction

A native American cultivar, has been widely cultivated around the world [1]. It is a very popular fruit due to its pleasant flavor, high nutritional value, and healthy effects [2, 3]. Fresh blueberry fruits are rich in various nutritional ingredients, such as anthocyanins, polyphenols, flavonoids, polysaccharides, vitamins, minerals, and dietary fibres, [4]. E cultivation of blueberry in China started in the mid1980s and began to be popularized in the early 21st century. According to an incomplete survey, over 100 different cultivars of blueberries have been introduced and bred in China, among which about 10–15 cultivars are important in the domestic market [12]

Methods

Results

Conclusion