2.1. Raw materials and reagents
Fig (Green Husk species) leaf used in this experiment was picked
up from 3 year-old trees in August 2013, in Weihai, China, washed
with deionized (DI) water to remove dust, and stored in a ventilated
room until use.
Rutin (purity ≥95%) was analytically pure and purchased
from Aladdin Co., Ltd. (Shanghai, China). Al(NO3)3, NaNO2, NaOH
and absolute ethanol were purchased from Sinopharm Chemical
Reagent Co., Ltd. (Shanghai, China) which were of analytical grade.