| Sains Malaysiana 52(4)(2023):
          
        1259-1272 http://doi.org/10.17576/jsm-2023-5204-17
            
           
             
           Optimization of Tween 80 and PEG-400
            Concentration in Indonesian Virgin Coconut Oil Nanoemulsion as Antibacterial against Staphylococcus aureus
  
 (Pengoptimuman Kepekatan Tween 80 dan PEG-400 dalam
            Nanoemulsi Minyak Kelapa Dara Indonesia sebagai Antibakteria terhadap Staphylococcus aureus)
  
           
             
           MIKSUSANTI1,
            ELSA FITRIA APRIANI2,* & AZZAHRA HITHTHAH BAMA BIHURININ2 
             
           1Department
            of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Jl. Palembang-Prabumulih,
            Km. 32, Ogan Ilir, South
            Sumatra, Indonesia
  
           2Department
            of Pharmacy, Faculty of Mathematics and Natural Sciences, Universitas Sriwijaya, Jl. Palembang-Prabumulih,
            Km. 32, Ogan Ilir, South
            Sumatra, Indonesia
  
           
             
           Diserahkan: 25 Oktober 2022/Diterima:
            6 Mac 2023
  
 
             
           Abstract
            
          Virgin Coconut
            Oil (VCO) can act as an antibacterial due to free fatty acids. To increase the
            stability of VCO, the VCO can be formed into nanoemulsion preparations. This study aimed to optimize the concentration of Tween 80 and
            Polyethylene glycol-400 (PEG-400) in nanoemulsion formula and determine antibacterial activity against Staphylococcus
              aureus. The content of VCO was determined using Gas Chromatography-Mass
            Spectrometry (GC-MS), and the results showed that VCO contained lauric acid, palmitic acid, caprylic acid, oleic acid, capric acid, and stearic acid.
            Optimization was carried out using the 22 factorial design method on
            the response of pH, density, percent transmittance, particle size, and polydispersity index. The optimum formula was obtained at
            concentrations of Tween 80 and PEG-400 40% and 26%, respectively, with a
            desirability value of 0.961. The optimum formula showed no phase separation and
            a significant decrease in pH (p>0.05). The optimum and comparison formula
            (pure VCO) had significantly different antibacterial activity (p<0.05) where
            the diameter of the inhibition zone was 24.77±1.66 mm and 16.73±2.00 mm,
            Minimum Inhibitory Concentration (MIC) of 1250 ppm and 2500 ppm, Minimum
            Bactericidal Concentration (MBC) of 2500 ppm and more than 2500 ppm,
            respectively. The optimum formula of VCO nanoemulsion was proven to have good stability and a potent antibacterial activity. 
             
           Keywords: Antibacterial;
            factorial design; nanoemulsion; Staphylococcus aureus; virgin coconut oil
            
           
             
          Abstrak
            
          Minyak Kelapa Dara (VCO) boleh bertindak sebagai antibakteria kerana kandungan asid lemak bebas. Bagi meningkatkan kestabilan VCO, ia boleh disediakan dalam bentuk nano-emulsi. Tujuan kajian ini dijalankan adalah untuk mendapatkan kepekatan yang optimum bagi Tween 80 dan Polietilena glikol-400 (PEG-400) di dalam formulasi nano-emulsi dan untuk menentukan aktiviti antibakteria terhadap Staphylococcus aureus. Kandungan VCO telah dianalisis dengan menggunakan Kromatografi gas–spektrometri jisim (GC-MS) dan hasilnya menunjukkan VCO mengandungi asid laurik, asid palmitik, asid kaprilat, asid oleik, asid kaprik dan asid stearik. Pengoptimuman telah dijalankan menggunakan kaedah reka bentuk faktorial 22 pada tindak balas pH, ketumpatan, peratus transmisi, saiz zarah dan indeks polidispersiti.
            Formula optimum didapati pada kepekatan Tween 80 dan PEG-400 masing-masing 40% dan 26%, dengan nilai kemahuan 0.961. Formula optimum juga menunjukkan tiada pemisahan campuran mahupun penurunan pH yang ketara (p>0.05). Formula optimum dan perbandingannya (VCO tulen) didapati mempunyai aktiviti antibakteria yang berbeza secara signifikan (p<0.05) dengan diameter zon inhibasi masing-masing ialah 24.77±1.66 mm dan 16.73±2.00 mm, Kepekatan Perencatan Minimum (MIC) 1250 ppm dan 2500 ppm dan Kepekatan Bakteria Minimum (MBC) 2500 ppm dan lebih daripada 2500 ppm.
            Formula optimum nano-emulsi VCO terbukti mempunyai kestabilan yang baik dan aktiviti antibakteria yang tinggi.
  
          
             
          Kata kunci: Antibakteria; minyak kelapa dara; nano-emulsi; reka bentuk faktor; Staphylococcus aureus
            
           
             
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           *Pengarang untuk surat-menyurat; email: elsafitria@mipa.unscri.ac.id 
             
          
          
           
         
            
          
           
          
           
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