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Chemometric Evaluation of Discrimination of Aromatic Plants by Using NIRS, LIBS

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Abstract

Aromatic plants have different chemical compositions that give them specific properties such as colour, aroma and taste and can be classified based on differentiation of various chemical constituents such as protein, vitamins, minerals, volatile and non-volatile oil, carbohydrates and the presence of adulterants. The aim of the present study was to develop a fast, simple and non-destructive method for discrimination of aromatic plants, juniper (Juniperus communis), rosemary (Rosmarinus officinalis), laurel (Laurus nobilis), sweet basil (Ocimum basilicum), black pepper (Piper nigrum), thyme (Origanum majorana), lavender (Lavandula latifolia), spearmint (Mentha spicata) and ginger (Zingiber officinale), commonly used. In order to discriminate aromatic plants, chemometric methods, namely principal component analysis (PCA), were used together with spectroscopic methods. Analysis of plant samples was carried out using Raman spectroscopy (RS), near-infrared spectroscopy (NIRS) and laser-induced breakdown spectroscopy (LIBS). Although Raman spectra of aromatic plant samples could not be obtained due to problems with sample degradation and fluorescence effect, satisfying classification of aromatic plant samples was accomplished by LIBS and NIRS. PCA models developed using NIRS data showed that the first two principal components explained 82.56% of the total variance. Elemental composition of the aromatic plant samples was investigated using LIBS, and the first two principal components explained 77.97% of the total variance in the PCA model generated by using the LIBS data. The ability to rapidly discriminate various culinary herbs makes these spectroscopic methods available to use by the aromatic plant industry in order to perform a fast quality control of incoming raw materials.

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Authors and Affiliations

  1. Department of Food Engineering, Faculty of Engineering, Hacettepe University, Beytepe, 06800, Ankara, Turkey

    Elif Ercioglu & Ismail Hakki Boyaci

  2. Department of Agricultural Biotechnology, Faculty of Agriculture, Namik Kemal University, 59030, Tekirdag, Turkey

    Hasan Murat Velioglu

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  1. Elif Ercioglu
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  2. Hasan Murat Velioglu
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  3. Ismail Hakki Boyaci
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Correspondence to Ismail Hakki Boyaci.

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Elif Ercioglu declares that she has no conflict of interest. Hasan Murat Velioglu declares that he has no conflict of interest. İsmail Hakki Boyaci declares that he has no conflict of interest.

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Ercioglu, E., Velioglu, H.M. & Boyaci, I.H. Chemometric Evaluation of Discrimination of Aromatic Plants by Using NIRS, LIBS. Food Anal. Methods 11, 1656–1667 (2018). https://doi.org/10.1007/s12161-018-1145-x

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