Aftab Alam1 
,
Rita Singh Majumdar1,
Pravej Alam2
For correspondence:- Aftab Alam Email: aftab.sharda@gmail.com
Accepted: 24 September 2019 Published: 31 October 2019
Citation: Alam A, Majumdar RS, Alam P. Development of HPTLC method for determination of α-terpinyl acetate, and evaluation of antioxidant properties of essential oils in Elettaria cardamomum. Trop J Pharm Res 2019; 18(10):2139-2145 doi: 10.4314/tjpr.v18i10.20
© 2019 The authors.
This is an Open Access article that uses a funding model which does not charge readers or their institutions for access and distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0) and the Budapest Open Access Initiative (http://www.budapestopenaccessinitiative.org/read), which permit unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited..
Purpose: To develop a simple and reliable protocol for high performance thin layer chromatography (HPTLC) quantification of α-terpinyl acetate in oils extracted from Elettaria cardamomum, and to study relative antioxidant potential of oils obtained from three varieties of fruits of E. cardamomum.
Methods: Essential oil was extracted separately from the fruits of three varieties of E. cardamomum, viz, Valley-green, Palakuzhi, and ICRI-2, using hydro-distillation method. In the development of an HPTLC method, standard α-terpinyl acetate was subjected to chromatography on aluminium-backed silica gel 60 F254 plates using a mobile phase of n-hexane: ethyl acetate (8:2, v/v), and quantified at 665 nm through densitometric analysis. The antioxidant property of essential oil of each cultivar was determined with respect to 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS) radical scavenging assays, as well as ferric reducing assay.
Results: The developed HPTLC method showed a good resolution for α-terpinyl acetate, with Rf of 0.64 ± 0.01, and also showed good linearity of the calibration plots (r2 = 0.9982). The HPTLC method was validated as per ICH guidelines, and used for the determination of α-terpinyl acetate in the essential oils. The valley green variety of E. cardamomum had the highest content of α-terpinyl acetate (55.36 ± 1.33 %w/w). The inhibitory capacity (IC50 value) for the oil of valley green variety as determined using DPPH and ABTS methods was 378.2 and 19.87 μg/mL, respectively.
Conclusion: The proposed HPTLC method is suitable for routine analysis of α-terpinyl acetate in medicinal herbs, and it reveals the role of α-terpinyl acetate in the antioxidant efficacy of cardamom oil.
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