Identification of different varieties of sesame oil using near-infrared hyperspectral imaging and chemometrics algorithms

PLoS One. 2014 May 30;9(5):e98522. doi: 10.1371/journal.pone.0098522. eCollection 2014.

Abstract

This study investigated the feasibility of using near infrared hyperspectral imaging (NIR-HSI) technique for non-destructive identification of sesame oil. Hyperspectral images of four varieties of sesame oil were obtained in the spectral region of 874-1734 nm. Reflectance values were extracted from each region of interest (ROI) of each sample. Competitive adaptive reweighted sampling (CARS), successive projections algorithm (SPA) and x-loading weights (x-LW) were carried out to identify the most significant wavelengths. Based on the sixty-four, seven and five wavelengths suggested by CARS, SPA and x-LW, respectively, two classified models (least squares-support vector machine, LS-SVM and linear discriminant analysis,LDA) were established. Among the established models, CARS-LS-SVM and CARS-LDA models performed well with the highest classification rate (100%) in both calibration and prediction sets. SPA-LS-SVM and SPA-LDA models obtained better results (95.59% and 98.53% of classification rate in prediction set) with only seven wavelengths (938, 1160, 1214, 1406, 1656, 1659 and 1663 nm). The x-LW-LS-SVM and x-LW-LDA models also obtained satisfactory results (>80% of classification rate in prediction set) with the only five wavelengths (921, 925, 995, 1453 and 1663 nm). The results showed that NIR-HSI technique could be used to identify the varieties of sesame oil rapidly and non-destructively, and CARS, SPA and x-LW were effective wavelengths selection methods.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Algorithms
  • Calibration
  • Discriminant Analysis
  • Least-Squares Analysis
  • Sesame Oil / chemistry*
  • Spectroscopy, Near-Infrared / methods*
  • Support Vector Machine

Substances

  • Sesame Oil

Grants and funding

This work was supported by 863 National High-Tech Research and Development Plan (Project No: 2012AA101903), Ningbo Department of Science and Technology (2011C11024) and the Fundamental Research Funds for the Central Universities of China (2012FZA6005, 2013QNA6011). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.