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A novel approach for lavender essential oil authentication and quality assessment
Mei Wang1, Jianping Zhao2, Zulfiqar Ali2
1National Center for Natural Products Research, School of Pharmacy, University of Mississippi, University, MS, 38677, USA; Natural Products Utilization Research Unit, Agricultural Research Service, U.S. Department of Agriculture, University, MS, 38677, USA.
A new Q-Index method effectively assesses lavender essential oil (LEO) quality and detects adulteration. This approach identifies key compounds, distinguishing authentic LEO from fraudulent samples for improved industry quality control.
Area of Science:
- Analytical Chemistry
- Natural Product Chemistry
- Food Science
Background:
- Current lavender essential oil (LEO) quality standards are insufficient due to LEO's complexity and market adulteration.
- Existing methods fail to adequately address the challenges in authenticating LEO quality.
- A need exists for reliable methods to assess LEO quality and detect adulteration.
Purpose of the Study:
- To develop an efficient and reliable method for lavender essential oil quality assessment.
- To establish a robust approach for detecting adulteration in lavender essential oil.
- To propose a novel quality index (Q-Index) for LEO analysis.
Main Methods:
- Analysis of 72 LEO samples using Gas Chromatography-Mass Spectrometry (GC/MS), Gas Chromatography-Quadrupole Time-of-Flight (GC/Q-ToF), and Nuclear Magnetic Resonance (NMR).
- Identification of 14 marker compounds and trans-furano-linalool oxide acetate as an indicator of synthetic adulteration.
- Development and validation of the Q-Index method using chemometric analysis and comparison with NMR.
Main Results:
- The Q-Index successfully discriminated between authentic LEOs (Q-Index > 100) and adulterated/poor-quality samples (Q-Index < 100).
- The Q-Index method demonstrated higher sensitivity in detecting synthetic compound adulteration compared to NMR.
- Results from GC/MS, NMR, and Q-Index methods showed good agreement, confirming the Q-Index's validity.
Conclusions:
- The proposed Q-Index method is an effective and reliable tool for lavender essential oil quality assessment and adulteration detection.
- This approach offers significant potential for improving quality control within the lavender essential oil industry.
- The Q-Index provides a sensitive and practical solution for identifying fraudulent or low-quality LEO products.
