Effect of Different Solvents on TPC and TFC of Produced OPE: Table 2 shows that total polyphenols content (TPC)
of the different orange peel extracts ( such as gallic acid) in the range from 63.20 - 169.56 mg/g orange peel extract.
While, total flavonoids content (TFC) was 13.89 - 29.75 µg/g (such as quercetin). Also, the same table indicats
that TPC and TFC are relatively higher in ethanolic extract (169.56 mg/g and 29.75 µg/g, respectively), followed by
methanolic extract (165.38 mg/g and 28.36 µg/g, respectively).