2.3. Total phenolics measurement
Total phenolics content of MPEE or green tea extract was determined by the
method as described previously (Singleton and Rossi, 1965) with minor modification. Briefly, 1 ml MilliQ water was added into the 200ll of the extract followed
by adding 50ll Folin–Ciocalteu reagent. The mixture was vortexed and incubated
for 7 min at room temperature (RT). Then 290ll of sodium carbonate (20%) was
added and mixed evenly. The absorbance was measured at 760 nm by UV–vis Spectrophotometer (UV mini 1240, Shimadzu Corporation, Japan) after 1 h incubation.
Quantitation of total phenolics content was based on the standard curve of gallic
acid. Results were expressed in terms of gallic acid equivalence (GAE) in mg per
dry pericarp weight in gram