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<p>The rise in demand for vegetable oils (VOs), especially sesame oil (SO), coupled with their economic value, has also increased the risk of adulteration by low-cost options, such as rice bran oil (RO) and mustard oil (MO). This study presents a laser-assisted method for detecting and characterizing such adulteration, emphasizing thermal diffusivity (D) as a sensitive and non-destructive marker for compositional changes. D reflects molecular mobility and heat transfer efficiency in oils and is quantified using the mode-mismatched dual-beam thermal lens (MMDBTL) technique. Adulteration levels ranging from 10 to 50% are analyzed, revealing that RO increases D due to its lower viscosity, while MO decreases D, indicating greater thermal resistance. Changes caused by adulteration are further examined with the help of Fourier transform infrared (FTIR), photoluminescence (PL), and UV–visible (UV–vis) absorption spectroscopy. FTIR spectroscopy exhibits limited sensitivity at low levels of adulteration. UV–vis spectroscopy indicates enhanced optical energy absorption with a red shift. PL spectra show a decrease in emission intensity with increasing adulterant levels, which is further validated using International Commission on Illumination (CIE) chromaticity coordinates and power spectral analysis. The inverse relationship observed between PL intensity and TL signal amplitude highlights the complementary nature of radiative and nonradiative pathways. The study confirms MMDBTL as a highly sensitive, non-destructive tool for detecting and distinguishing oil adulterants and suggests its potential for tailoring thermal properties for specific functional uses.</p>

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Thermal Diffusivity as a Marker for Adulteration in Sesame Oil: A Laser-Assisted Quality Assessment

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • P. Anju Abraham,
  • T. S. Athulya,
  • M. S. Swapna,
  • S. Sankararaman

摘要

The rise in demand for vegetable oils (VOs), especially sesame oil (SO), coupled with their economic value, has also increased the risk of adulteration by low-cost options, such as rice bran oil (RO) and mustard oil (MO). This study presents a laser-assisted method for detecting and characterizing such adulteration, emphasizing thermal diffusivity (D) as a sensitive and non-destructive marker for compositional changes. D reflects molecular mobility and heat transfer efficiency in oils and is quantified using the mode-mismatched dual-beam thermal lens (MMDBTL) technique. Adulteration levels ranging from 10 to 50% are analyzed, revealing that RO increases D due to its lower viscosity, while MO decreases D, indicating greater thermal resistance. Changes caused by adulteration are further examined with the help of Fourier transform infrared (FTIR), photoluminescence (PL), and UV–visible (UV–vis) absorption spectroscopy. FTIR spectroscopy exhibits limited sensitivity at low levels of adulteration. UV–vis spectroscopy indicates enhanced optical energy absorption with a red shift. PL spectra show a decrease in emission intensity with increasing adulterant levels, which is further validated using International Commission on Illumination (CIE) chromaticity coordinates and power spectral analysis. The inverse relationship observed between PL intensity and TL signal amplitude highlights the complementary nature of radiative and nonradiative pathways. The study confirms MMDBTL as a highly sensitive, non-destructive tool for detecting and distinguishing oil adulterants and suggests its potential for tailoring thermal properties for specific functional uses.