Rapid detecting total acid content and classifying different types of vinegar based on near infrared spectroscopy and least-squares support vector machine

► NIR coupled with LS-SVM was used to detection quality of 95 Chinese vinegars. ► White vinegar and fruit vinegar were separated from traditional vinegar categories by PCA. ► LS-SVM was firstly applied to identify mature vinegar, aromatic vinegar and ric vinegar. ► LS-SVM also be used to predication total acid content in all vinegar samples.