Pancreatic Lipase Inhibition by Polyphenols in Persimmon Leaf Tea

Area of Science:

• Food Science
• Biochemistry
• Pharmacology

Background:

• Persimmon (Diospyros kaki) leaf tea is a traditional beverage rich in polyphenols.
• While associated with health benefits, its effect on dietary lipid digestion is not fully understood.

Purpose of the Study:

• To evaluate the pancreatic lipase-inhibitory effect of persimmon leaf tea.
• To identify the key compounds responsible for this inhibition.

Main Methods:

• Hot-water extracts of persimmon leaves were tested for pancreatic lipase inhibition using synthetic (p-nitrophenyl palmitate) and physiological (triacylglycerol emulsion) substrates.
• High-performance liquid chromatography identified major flavonoids.
• In vitro assays assessed the inhibitory effects of individual flavonoids and polyphenol-depleted extracts.

Main Results:

• Persimmon leaf tea demonstrated concentration-dependent inhibition of pancreatic lipase.
• Astragalin and isoquercitrin were identified as major inhibitory flavonoids, with astragalin showing slightly stronger activity.
• Polyphenolic compounds were identified as major contributors to the lipase-inhibitory effect.

Conclusions:

• Persimmon leaf tea suppresses lipid digestion via the combined action of its major flavonoids.
• The tea exhibits milder inhibition compared to orlistat, potentially suitable for long-term dietary use.
• Persimmon leaf tea shows potential as a functional beverage for moderating dietary fat absorption.