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Oral bacterial infections are fairly common in patients with diabetes mellitus; however, due to limited treatment options, herbal medicines are considered an alternate solution. This study aimed to formulate a stable essential-oil-loaded nanoemulsion for the treatment of oral bacterial infections. Essential oils from edible sources including coriander, clove, cinnamon and cardamom were extracted by hydrodistillation. The response surface methodology was used to optimize the nanoemulsion formulation by applying the Box–Behnken design. The oil concentration, surfactant concentration and stirring speed were three independent factors, and particle size and polydispersity index were two responses. The particle size, polydispersity index and zeta potential of the optimized formulation were 130 mm, 0.222 and −22.9, respectively. The ATR-FTIR analysis revealed that there was no incompatibility between the active ingredients and the excipients. A significant release profile in active ingredients of nanoemulsion, i.e., 88.75% of the cinnamaldehyde and 89.33% of eugenol, was recorded after 24 h. In the ex vivo goat mucosal permeation study, 71.67% of the cinnamaldehyde permeated and that of the eugenol 70.75% from the nanoemulsion. The optimized formulation of the essential-oil-loaded nanoemulsion showed a 9 mm zone of inhibition against Staphylococcus aureus and Staphylococcus epidermidis, whereas in anti-quorum sensing analysis, the optimized nanoemulsion formulation showed an 18 mm zone of inhibition. It was concluded that formulated essential-oil-loaded nanoemulsion can be used against S. epidermidis and S. aureus infections in oral cavity. [ABSTRACT FROM AUTHOR]

• A new series of chalcones based pyrazole were designed and synthesized. • Compounds 5a, 5l and 5w were assigned their chemical structures by X-ray diffraction analysis. • Some compounds exhibited in vitro anti-acetylcholinesterase potential, antidiabetic potential against α-glucosidase and α-amylase, and antioxidant potentials against DPPH free radicals. About 25 chalcones engrafted pyrazole scaffold combined with benzothiophene and indole moieties 5a-y were designed and constructed in two steps using readily available acetyl acetone, phenyl hydrazine and DMF-DMA as starting material. The synthesized chalcone analogs were screened for in vitro anti-acetylcholinesterase potential, antidiabetic potential against α -glucosidase and α -amylase, and antioxidant potentials against DPPH free radicals. The compounds 5a, 5r, 5m, 5o and 5p showed strongest acetylcholine esterase inhibition (AChEI) with IC 50 values of 5 ± 1.16 μg/mL (5p), 8 ± 0.14 μg/mL (5a), 8 ± 0.57 μg/mL (5r), 10 ± 1.73 μg/mL (5m) and 10 ± 0.60 μg/mL (5o). The highest inhibition against α -glucosidase was demonstrated by compounds 5f, 5o, 5j, 5e, 5c, and 5a with IC 50 values of 4 ± 0.14, 6 ± 0.43, 8 ± 0.43, 10 ± 0.11, 11 ± 0.28 and 12 ± 0.57 μg/mL respectively, whereas, the compounds 5x, 5d, 5w, 5y and 5u showed prominent α-amylase inhibition with IC 50 values of 20 ± 1.15 μg/mL (5x), 30 ± 0.60 μg/mL (5d), 40 ± 0.72 μg/mL (5w), 40 ± 0.50 μg/mL (5y), and 60 ± 2.19 μg/mL (5u). The highest anti-oxidant potential against DPPH free radicals was demonstrated by compounds 5w, 5v and 5y with IC 50 values of 160 ± 5.77, 260 ± 4.63, and 360 ± 4.04 μg/mL respectively. Molecular docking was used to study their interaction with the active site of enzymes. [ABSTRACT FROM AUTHOR]