Abstract
Common maize seeds and silage maize seeds are similar in appearance and are difficult to identify with the naked eye. Four varieties of common maize seeds and four varieties of silage maize seeds were identified by near-infrared hyperspectral imaging (NIR-HSI) combined with chemometrics. The pixel-wise principal component analysis was used to distinguish the differences among different varieties of maize seeds. The object-wise spectra of each single seed sample were extracted to build classification models. Support vector machine (SVM) and radial basis function neural network (RBFNN) classification models were established using two different classification strategies. First, the maize seeds were directly classified into eight varieties with the prediction accuracy of the SVM model and RBFNN model over 86%. Second, the seeds of silage maize and common maize were firstly classified with the classification accuracy over 88%, then the seeds were classified into four varieties, respectively. The classification accuracy of silage maize seeds was over 98%, and the classification accuracy of common maize seeds was over 97%. The results showed that the varieties of common maize seeds and silage maize seeds could be classified by NIR-HSI combined with chemometrics, which provided an effective means to ensure the purity of maize seeds, especially to isolate common seeds and silage seeds.
Highlights
Maize is an important food crop in the world
It is difficult to distinguish a mixture of common maize seeds and silage maize seeds
Identi cation of different varieties of common maize seeds and silage maize seeds is an important step to ensure the purity of maize seeds
Summary
Maize is an important food crop in the world. It can be classi ed into common (edible) maize and silage maize according to their uses. Common maize has different varieties, including sweet maize, waxy maize and so on. It is difficult to distinguish a mixture of common maize seeds and silage maize seeds. In the process of maize harvesting and marketing, different varieties of maize seeds are likely to be mixed and are difficult to be detected, which will have a certain impact on sellers and consumers. Strengthening the identi cation of maize seed purity is the key to ensure the purity of maize seeds. Identi cation of different varieties of common maize seeds and silage maize seeds is an important step to ensure the purity of maize seeds
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