Suntheanine
product may be the only ‘pure’ L-theanine ingredient on the US market
Scientist says most L-theanine products impure
8/10/2003 - Taiyo International’s Suntheanine product may be the only ‘pure’ L-theanine ingredient on the US market, claim its researchers who report that the amino acid, which is found in green tea and associated with relaxing effects, may sometimes have a different composition in bulk commercial products.
The findings of Dr Daniel Armstrong, the Caldwell Professor of Chemistry at Iowa State University, are from a series of chemical analyses performed on several commercially available raw materials claiming to be pure L-theanine.
Armstrong said that his team's analysis of several ingredients being sold and marketed as ‘L-theanine’ had revealed that they contain more than just the L-form.
“We found all of those tested that are made through chemical synthesis or claiming to be extracted from green tea actually have about 50 per cent present as D-theanine," he said, adding that "the only material that proved to be pure L-theanine was the Suntheanine brand, produced via biofermentation, which had more than 99.95 per cent L-theanine, our current detection limit".
Suntheanine L-theanine is included in the CortiSlim TM and Cortisyn TM.
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