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Effect of biological salts and additives on the stability of (A) Helichrysum odoratissimum methanol extract + Gum arabic, (B) H. odoratissimum methanol extract – Gum arabic, (C) H. odoratissimum leaf powder + Gum arabic and (D) H. odoratissimum leaf powder – Gum arabic gold nanoparticles at pH 7 from 450 to 800 nm.
