This study used zirconium phosphate as an adsorbent to isolate a strictinin-rich polyphenol fraction from Chinese green tea extract. The strictinin content rose from 4.96% in the extract to 58.2% in the isolated fraction. Zirconium carryover into the fraction was not reported.
Key numbers
- Strictinin HPLC content increased from 4.96% in 70% ethanol green tea extract to 58.2% after isolation with zirconium phosphate calcined at 900 °C (Abstract).
- This paper reports no numerical findings relevant to zirconium exposure.
Methods (brief)
Preparation of zirconium phosphate at several calcination temperatures, adsorption and desorption of tea polyphenols, and HPLC analysis.
Evidence fitness
Off-topic for dietary exposure. The paper uses zirconium phosphate as an adsorbent for tea polyphenol isolation; it does not support dietary exposure or toxicity claims for zirconium. Zirconium residues in the isolated polyphenol were not measured.
Limitations
No zirconium was measured in food, water, soil or human samples, so nothing in the paper describes exposure.
Related evidence
Update history
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