Low grade grapes and red pepper were
obtained from local market. The material
was collected immediately prior to the
disposal step, blended and homogenized by
using Sonicator (Ultrasonic processor) XL
No. 2015 10 in dark place, then placed in
petri dish, packed with aluminium foil and
stored in a refrigerator at 50°C. All
samples were freeze dried (LABCONCO, Kansas City, USA) at 50 °C & 0.014 mbar
for 2 days to reach moisture content 4 %. Grapes and pepper samples powder were
ground and stored in a refrigerator at 80 °C
in brown glass bottle to prevent oxidative
damage until extraction.