Vibrational Spectroscopy as a Rapid Quality Control Method for <i>Melaleuca alternifolia</i> Cheel (Tea Tree Oil)

Tankeu, Sidonie; Vermaak, Ilze; Kamatou, Guy; Viljoen, Alvaro

doi:10.1002/pca.2470

Cited by 20 publications

(12 citation statements)

References 19 publications

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“…A broad peak around 3300 cm −1 observed in α-terpineol and terpinen-4-ol indicates the O–H bond stretching vibration [ 13 , 24 , 25 ]. The C–H stretching of an alkyl or alkenyl group gives an absorption in the 2800–3000 cm −1 range [ 20 , 26 ]. The C–H bendings of an alkyl group and an alkenyl group occur in the 1300–1500 cm −1 [ 24 , 25 , 26 , 27 ] and 700–900 cm −1 ranges [ 7 , 26 ], respectively.…”

Section: Resultsmentioning

confidence: 99%

“…α-Terpineol (96% purity, Alfa Aesar, Ward Hill, MA, USA), 1,8-cineole (99% purity, Alfa Aesar, Ward Hill, MA, USA), terpinen-4-ol (≥95% purity, Sigma Aldrich, Burlington, MA, USA), α–terpinene (≥95% purity, Sigma Aldrich, Burlington, MA, USA), and γ–terpinene (97% purity, Sigma Aldrich, Burlington, MA, USA) were analyzed as reference materials to determine the constituents. These organic materials have been known for the main phytochemical constituents of tea tree extract [ 20 ].…”

Section: Methodsmentioning

confidence: 99%

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Corrosion Inhibition of Mild Steel and 304 Stainless Steel in 1 M Hydrochloric Acid Solution by Tea Tree Extract and Its Main Constituents

2021

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Tea tree extract, containing antioxidant constituents α-terpineol, terpinen-4-ol, and α-terpinene, has a wide range of applications in the cosmetic, food, and pharmaceutical industries. In this study, tea tree extract showed an anticorrosive effect under 1 M HCl solution on mild steel (MS) and 304 stainless steel (STS). Uniform corrosion for MS and pitting corrosion for STS at 298 K were retarded, with inhibition efficiencies of 77% and 86%, respectively. The inhibition of uniform and pitting corrosion was confirmed by scanning electron microscopy and laser scanning confocal microscopy in terms of surface roughness and pitting morphologies. The most effective constituent contributing to the inhibitory performance of tea tree extract was revealed to be α-terpineol, with an inhibition efficiency of 83%. The adsorption of tea tree extract was confirmed by surface characterization analysis using Fourier transform infrared spectroscopy, Raman spectroscopy, and Electrochemical impedance spectroscopy. Interestingly, G- and D-peaks of Raman spectra were detected from the inhibited steels, and this finding is the first example in the corrosion inhibition field. The anticorrosion mechanism can be explained by the formation of organic-Fe complexes on the corroded steel surface via electron donor and acceptor interactions in the presence of an oxygen atom of the hydroxyl group or ether of organic inhibitors.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Corrosion Inhibition of Mild Steel and 304 Stainless Steel in 1 M Hydrochloric Acid Solution by Tea Tree Extract and Its Main Constituents

2021

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“…A previous study used mid‐infrared and NIR spectra to predict the seven main terpenoids in TTO. [ 26 ] Using 55 TTO samples obtained from various sources in South Africa, they successfully developed partial least squares (PLS) multivariate calibration models for all seven terpenoids, with CV r 2 ranging from 0.97 for 1,8‐cineole to 0.76 for α‐terpinene and RMSE between 0.2% for low‐abundant terpinolene to 3.5% for high‐abundant terpinen‐4‐ol. The Raman approach of this study improved on these outcomes in several respects.…”

Section: Discussionmentioning

confidence: 99%

Predicting tea tree oil distillate composition using portable spectrometric technology

Gloerfelt-Tarp

Mieog

Bigland³

et al. 2022

J Raman Spectroscopy

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Commercial tea tree oil (TTO) has to conform chemically to the international standard ISO4730: 2017, which defines acceptable ranges for the 15 main terpenoids therein. Lack of in‐house capacity for the technology typically required for terpenoid quantification (GC‐FID) necessitates that Australian TTO producers outsource the analyses to commercial service providers. This is associated with high cost and slow turnaround times, which have been recognized as limiting factors for TTO process optimization in the areas of quality assurance, distillation and blending. This paper describes the testing of two custom portable Raman devices with different lasers (785 and 1064 nm) for the relative quantification of the 15 main TTO components using model‐based predictions. Initial testing showed that the 1064‐nm device provided superior data for TTO predictions. Machine‐learning algorithms were trained with spectral data from the 1064‐nm device and corresponding GC‐FID data from 214 TTO samples. Hold‐over validation (HV) correlations between actual and predicted values using up to 53 unseen samples showed r2 at or above 0.92 for 10 and at or above 0.95 for 6 of the 15 specified terpenoids. The highly abundant key TTO quality compound terpinen‐4‐ol showed an HV r2 of 0.96 with a root mean square error (RMSE) of 0.37%, whereas the lowly abundant key compound 1,8‐cineole showed an HV r2 of 1.00 with a RMSE of 0.13%. These results indicated a strong potential for Raman spectrometry to provide real‐time product quality data at TTO distillation sites enabling direct feedback control and process optimisations.

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“…The quantitative analysis of pulegone in hydrodistilled pennyroyal oils (Mentha pulegium) by FTIR, combined with PLS regression, was investigated in [194]. MIR and NIR spectroscopy, in combination with PLS calibration models, were successfully used to predict the contents of seven major compounds of the essential oils of Melaleuca alternifolia [195]. Qualitative and quantitative assessment of lavender oil (Lavandula angustifolia) biomarkers were made in [196], using MIR and NIR spectroscopy combined with PLS.…”

Section: Metabolomics Quality and Authenticationmentioning

confidence: 99%

Recent advances in untargeted and targeted approaches applied in herbal-extracts and essential-oils fingerprinting - A review

Kharbach

Marmouzi

Jemli

et al. 2020

Journal of Pharmaceutical and Biomedical Analysis

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Vibrational Spectroscopy as a Rapid Quality Control Method for Melaleuca alternifolia Cheel (Tea Tree Oil)

Cited by 20 publications

References 19 publications

Corrosion Inhibition of Mild Steel and 304 Stainless Steel in 1 M Hydrochloric Acid Solution by Tea Tree Extract and Its Main Constituents

Corrosion Inhibition of Mild Steel and 304 Stainless Steel in 1 M Hydrochloric Acid Solution by Tea Tree Extract and Its Main Constituents

Predicting tea tree oil distillate composition using portable spectrometric technology

Recent advances in untargeted and targeted approaches applied in herbal-extracts and essential-oils fingerprinting - A review

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