Quantitative determination of alpha-tocopherol in Arbutus unedo by TLC-densitometry and colorimetry. 
A quantitative determination of alpha-tocopherol in Arbutus unedo leaves was established by TLC-densitometry and colorimetry.  Data obtained by TLC-densitometry were compared with those obtained by colorimetry.  Also, the alpha-tocopherol content in leaves collected at different times of the year was studied comparatively.  The highest amount of alpha-tocopherol was found in the March collection.