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A gradient based facile HPLC method for simultaneous estimation of antioxidants extracted from tea powder
Shankara H Nanjegowda1, Manasa G Papanna2, Raghu Ram Achar3
1Department of Chemistry, Sri Jayachamarajendra College of Engineering, JSS Technical Institutions Campus, Mysore, 570 006 India ; Institute of Excellence, Vijnana Bhavana, Manasagangotri, Mysore, 570 006 India.
Journal of Food Science and Technology
|July 14, 2016
Summary
A new RP-HPLC method accurately quantifies major tea powder bioactives (TPBAs) like caffeine and EGCG. This validated technique offers precise and rapid analysis for quality control.
Area of Science:
- Analytical Chemistry
- Pharmacognosy
- Food Science
Background:
- Tea powder contains various bioactive compounds with significant health benefits.
- Accurate quantification of these compounds is crucial for quality control and research.
- Existing methods may lack the simplicity, speed, or precision required for routine analysis.
Purpose of the Study:
- To develop a simple, rapid, and precise RP-HPLC method for simultaneous estimation of key tea powder bioactives (TPBAs).
- To validate the developed method according to ICH guidelines for reliability.
- To analyze the antioxidant properties of individual TPBAs to confirm their identity and activity.
Main Methods:
- Extraction of TPBAs (caffeine, EGCG, Ct, EC, ECG) from tea powder using ethanol:water mixtures.
- Simultaneous quantitative determination using a gradient RP-HPLC method with UV detection at 205 nm.
- Method validation including specificity, linearity (0.5-60 μg/mL, R²=0.999-1.0), accuracy, precision, LOQ, and LOD.
Main Results:
- A validated RP-HPLC method was successfully established for the simultaneous quantification of five major TPBAs.
- The method demonstrated excellent linearity, precision, and accuracy, meeting ICH guideline requirements.
- Antioxidant activity analysis confirmed the identity and biological relevance of the quantified TPBAs.
Conclusions:
- The developed RP-HPLC method provides a robust, efficient, and accurate tool for analyzing key bioactive compounds in tea powder.
- This method can be effectively utilized for quality control and standardization of tea products.
- The findings support the established antioxidant properties of major tea polyphenols.
