1. Preparation of crude extract from freeze-dried berry powder.To begin the this procedure, prepare the reagents as outline in the expert protocol.Next,Weigh out 10 g of freeze-dried blackberry powder. add the blackberry powder to a 1 L round-bottom flask containing 100 mL of 80% aqueous ethanol.Place the flask into an ultrasonic bath at 25 °C. Under continuous nitrogen purging in subdued light. Sonicate the mixture for 20 min at 42 kHz, 135 W.After this, use a chilled buchner funnel with vacuum suction to filter the mixture through a #2 filter paper.NOTE: At the end of this step, residuals of the sample appear on the filter paper; this is called filter cake.Rinse the filter cake with 50 mL of 100% ethanol. Save the filtrate and add the filter cake to a 1 L round-bottom flask containing 100 mL of 80% aqueous ethanol.Repeat the extraction process by sonicating, filtering and washing the mixture. Combine the two filtrates into a round-bottom flask containing 50 mL of 80% aqueous ethanol.NOTE: The final volume should be approximately 300 mL.Use a rotary evaporator at 62 °C and 50 rpm to evaporate the solvent. Continue this until the ethanol no longer evaporates. NOTE: This process takes approximately 45 min.Transfer the sample to a 50 mL conical tube. Inject nitrogen gas at the top of the tube for 10 min to evaporate any remaining ethanol .NOTE: This step is needed to ensure the complete evaporation of the ethanol. The volume of the sample at this step is approximately 20 mL.Freeze the sample at -80 °C for at least 24 h.NOTE: This step is needed to allow for a more efficient freeze-drying process.Freeze-dry the sample at -50 °C for approximately 8 h. Store the samples at -20 °C until ready to use. NOTE: The freeze dryer creates a powerful vacuum at -50 °C inside the chamber to dry the samples but preserves most of the compounds, such as polyphenols.Preparation of purified polyphenol extractsWeigh the freeze-dried extracted samples. NOTE: The volume of the extract at this step is approximately 10 mL. Add approximately ~20 mL of chloroform to a 100mL beaker with the sample. use a stir-plate. mix the solution for 5 min. Pour the mixture into a separating funnel. Let the crude extract decant for 1 h at RT. NOTE: At this step, a two-phase mixture will form. After this, discard the bottom layer (chloroform phase) and collect the aqueous layer into a clean beaker. Add two volumes of ethyl acetate to the beaker. Use a magnetic stir bar to stir the mixture for 5 min at RT. Use a chilled Buchner funnel with vacuum suction to filter the mixture through #2 filter paper Transfer the filtered sample to a round-bottom flask. Use the rotary evaporator to 62 °C and 50 rpm and evaporate the ethyl acetate for about 30 min. Freeze-dry the sample at -50 °C for 8 h. Transfer the sample to a 50 mL conical tube and store it at -20 °C.(negative twenty degree celsius)