Acetone ace

Blackberries were purchased from a local store (SuperValu, Ireland). The berries originated from Morocco and belonged to the Elvira variety. After lyophilization of whole berries for 48 h on a freeze-dryer (Lyovapor™ L-300, Büchi, Flawil, Switzerland), the lyophilized blackberries were ground with a mixer, and the samples were further lyophilized for another 48 h to total dryness. The final lyophilized sample was pulverized into a fine powder of a particle size ≤400 μm using a mesh sieve, vacuum-packed, and stored at −20 °C and in the dark until further use.
F-C phenol reagent, gallic acid, sodium carbonate (Na₂CO₃), Trolox, formic acid (HCOOH), sodium chloride (NaCl), magnesium chloride hexahydrate (MgCl₂•6H₂O), and acetone (Ace) were purchased from Sigma-Aldrich (now Merck, Wicklow, Ireland). The standards of phenolic compounds were obtained from Extrasynthese (Extrasynthese Co., Genay Cedex, France). Acetonitrile (ACN) was acquired from Romil (Lennox Laboratory Supplies LTD, Dublin, Ireland). Milli-Q^® (18.2 mΩ) (Merck Millipore, Molsheim, France) water (H₂O) was used throughout the experiments.

PVDF-HFP pellets with (Mw ∼ 400,000 kg mol-1), indium tin oxide (ITO) coated polyethylene terephthalate (PET) electrodes with an average area of 20 mm × 10 mm, and polydimethylsiloxane (PDMS) were purchased from Sigma-Aldrich Chemical Co. (United States). CB particles with average diameter of 40 nm was purchased from Alfa Aesar (United States). Solutions were prepared using N, N-dimethylformamide (DMF) and acetone (ACE) both purchased from Sigma Aldrich.

AV (99.5%), BEMT (98.7%), OCT (97%), EHT (>98%), 2-vinylnapthalene (95%) (2-VNT, internal standard), n-propyl acetate, and p-cymene were purchased from Sigma-Aldrich (St. Louis, MO, USA). OMC, anisole, and p-xylene were supplied by Tokyo Chemical Industry (Tokyo, Japan). Methanol (MeOH), ethanol (EtOH), isopropanol (IPP), formic acid, acetonitrile (ACN), and acetone (ACE) were obtained from Merck (Darmstadt, Germany). The deionized water was produced using a Milli-Q Lab system (Bedford, MA, USA). The components of the two homemade sunscreen lotions were received from local cosmetics producers.
Standard stock solutions of each UV filter were prepared in ACE at a concentration of 1 mg/mL (or 2 mg/mL for OCT). The mixed working standard solution of each UV filter was diluted with water to a final ACE:water composition of 1:39 (v/v). A solution of 2-VNT (100 μg/mL) was prepared in ACN. All prepared solutions were stored in the dark at 4 °C until required for use.