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Agriculture

Ultrasonic-Assisted Extraction Enhances Bioactive Compounds and Antioxidant Activity in White Tea

Strategic Insights

— 1 min read

A recent study published in the Journal of the Saudi Society of Agricultural Sciences has investigated the effects of ultrasonic-assisted extraction (UAE) methods on the bioactive compounds and antioxidant activities of white tea extracts from three different cultivars. The research, conducted by Chulalongkorn University, found that UAE probe extraction yielded higher concentrations of bioactive compounds, while the UAE bath preserved greater antioxidant activity. The study highlights the potential applications of UAE techniques in producing bioactive-rich white tea extracts, particularly from purple-leaf cultivars, for use in functional foods, nutraceuticals, and cosmetics.

Key Takeaways:

  • The study employed HPLC to quantify catechin, epicatechin, epigallocatechin gallate (EGCG), gallic acid, and caffeine in white tea extracts from two purple-leaf cultivars (SS-2 and SS-3) and one green-leaf cultivar (GMB-7).
  • UAE probe extraction yielded higher concentrations of bioactive compounds, while the UAE bath preserved greater antioxidant activity.
  • Longer extraction times improved both phytochemical content and antioxidant capacity across all cultivars.
  • Purple-leaf cultivars exhibited significantly higher levels of anthocyanins, polyphenols, and flavonoids (p
  • Multivariate analyzes, including principal component analysis (PCA) and heat map visualization, revealed different clustering patterns based on cultivar type and extraction method, explaining 70.82% of total variance.
  • The findings highlight the effectiveness of UAE techniques in producing bioactive-rich white tea extracts, particularly from purple-leaf cultivars.
  • The study's results have potential applications in functional foods, nutraceuticals, and cosmetics.

Statistics:

  • TPC (Total Phenolic Content) ranged from 318.52 to 352.51 mg GAE/g for the bath method and 327.53 to 376.45 mg GAE/g for the probe.
  • Longer extraction times improved both phytochemical content and antioxidant capacity across all cultivars by an average of 15.63% (p 0.05).
  • The study found that 70.82% of total variance could be explained by different clustering patterns based on cultivar type and extraction method.

Sources:

  • "Effects of ultrasound-assisted bath, probe, and extraction time on bioactive compounds and antioxidant activity in white tea (Camellia sinensis) extracts from purple- and green-leaf cultivars." Journal of the Saudi Society of Agricultural Sciences, 2025, 24(3):1-17.
  • Mukhammad Iqbal Prawira-Atmaja, Department of Food Technology, Faculty of Science, Chulalongkorn University.
  • Sirima Puangpraphant, Department of Food Technology, Faculty of Science, Chulalongkorn University.

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