Angga Saputra Yasir, Siwi Nurbaiti, Jenifer Kolina, Amalia Lathifah Widiadari, H. Harmiansyah, Muhammad Asyraf Muhammad Rizal, Melbi Mahardika
Despite the well-documented antimicrobial and antioxidant properties of Parameria laevigata (kayu rapet) bark, its incorporation into a dissolving microneedle (DMN) platform for transdermal acne therapy has not been previously investigated. This study developed and characterized PVA/PVP-based DMN arrays loaded with P. laevigata extract as a minimally invasive delivery system targeting acne-associated pathogens. Ultrasonic-assisted extraction in 95% ethanol yielded a phytochemical-rich extract (8.68%) containing flavonoids, tannins, saponins, and alkaloids, with strong antioxidant activity (DPPH IC50 = 40.98 ± 4.32 ppm; ABTS IC50 = 46.92 ± 3.25 ppm; FRAP = 70.24 ± 6.41 mg AAE/g extract) and moderate antibacterial activity against Staphylococcus aureus and Cutibacterium acnes at 100–150 ppm (inhibition zone: 8.22–8.46 mm). Eight DMN formulations were fabricated at a fixed 30% w/w PVA/PVP total polymer concentration with 5% extract loading. The optimized formulation (F2) produced a complete 49-needle pyramidal array with adequate mechanical integrity for stratum corneum penetration, confirmed polymer–extract physicochemical compatibility by FTIR, and exhibited Korsmeyer–Peppas release kinetics with a diffusion-controlled mechanism reaching 56.48% cumulative release over 24 h. These findings establish P. laevigata-loaded DMN arrays as a viable proof-of-concept platform for transdermal acne therapy, warranting further ex vivo permeation and in vivo efficacy validation. © 2026, Magister Program of Material Sciences, Graduate School of Sriwijaya University. All rights reserved.
Cosmetic Engineering Study Program, Institut Teknologi Sumatera, Lampung, 35365, Indonesia; Centre for Advanced Composite Materials (CACM), Universiti Teknologi Malaysia, Johor, Johor Bahru, 81310, Malaysia; Department of Applied Mechanics and Design, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Johor, Johor Bahru, 81310, Malaysia; Department of Biosystem Engineering, Faculty of Industrial Technology, Institut Teknologi Sumatera, Lampung, 35365, Indonesia; Institute of Tropical Forestry and Forest Products (INTROP), Universiti Putra Malaysia, Selangor, Serdang, 43400, Malaysia; Research Center for Biomass and Bioproducts, National Research and Innovation Agency (BRIN), South Tangerang, Serpong, 15314, Indonesia