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ScopeThe rare enolic phenylpyruvic acid‐2‐O‐glucoside, (PPAG:Z‐2‐(β‐d‐glucopyranosyloxy)‐3‐phenylpropenoic acid), is one of the major constituents of fermented rooibos infusions. 3‐Phenylpyruvic acid (2‐oxo‐3‐phenylpropanoic acid), without the sugar moiety and with a keto form instead of an enolic arrangement, has been shown to enhance insulin release and glucose uptake in muscle cells. The purpose...
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