Sains Malaysiana 54(7)(2025): 1701-1711

http://doi.org/10.17576/jsm-2025-5407-05

 

Silver Nanoparticles Synthesised with Red Betel Leaf (Piper crocatum) Extract as a Photosensitiser for Inactivation of Escherichia coli and Staphylococcus aureus

(Nanopartikel Perak Disintesis dengan Ekstrak Daun Sirih Merah (Piper crocatum) sebagai Fotopemeka untuk Menyahaktifkan Escherichia coli dan Staphylococcus aureus)

 

SURYANI DYAH ASTUTI1,*, DAMITA KARREN1, YUNUS SUSILO2, AHMAD KHALIL YAQUBI3, ANDI HAMIM ZAIDAN1 & NASRUL ANUAR ABD RAZAK4 

 

1Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya, 60115, East Java, Indonesia

2Faculty of Engineering Dr Soetomo University, Surabaya 60118, Indonesia

3Doctorate Degree, Faculty of Science and Technology, Airlangga University, Surabaya, 60115, Indonesia

4Department of Biomedical Engineering, Faculty of Engineering, Universiti Malaya, 50603 Kuala Lumpur, Malaysia

 

Diserahkan: 25 April 2024/Diterima: 22 Mei 2025

 

Abstract

Infectious diseases caused by Escherichia coli and Staphylococcus aureus are major health concerns in Indonesia, exacerbated by antibiotic resistance and biofilm formation. This study explores the use of betel leaf-synthesised silver nanoparticles (AgNPs) combined with red laser irradiation to enhance antimicrobial effectiveness against these resistant bacteria. The study included four groups: a control group (T0) without laser irradiation, E. coli groups (A1 and A2), and S. aureus groups (A3 and A4) treated with varying concentrations of AgNPs and irradiated with a 665 nm diode laser. The photosensitiser group (A2 and A4) received AgNPs synthesised from red betel leaf extract (AgNPs-Pc), followed by a 10-min incubation. The samples were then irradiated at four different times: 90, 120, 150, and 180 min, using a laser with a wavelength of 665 nm to evaluate the antimicrobial effects. The findings showed that AgNPs-Pc combined with a red laser significantly reduced E. coli growth compared to the control group without photosensitiser. For S. aureus, growth occurred after irradiation without photosensitiser (PS). Irradiation of S. aureus with AgNPs-Pc at concentrations of 1 mM, 1.5 mM, and 2 mM for 150 s resulted in bacterial death reductions of 89.74%, 91.24%, and 89.05%, respectively. The effective inactivation of E. coli was 87.29 ± 2.68% at an energy density of 22.68 J/cm². S. aureus required a higher energy density of 37.80 J/cm² for 91.24 ± 2.76% inactivation. This study shows that red betel leaf extract-synthesised silver nanoparticles combined with red laser irradiation effectively combat antibiotic-resistant E. coli and S. aureus.

Keywords: Escherichia coli; photoinactivation; photosensitiser; red diode laser; Staphylococcus aureus

 

Abstrak

Penyakit berjangkit yang disebabkan oleh Escherichia coli dan Staphylococcus aureus merupakan masalah kesihatan utama di Indonesia, diburukkan lagi dengan kerintangan antibiotik dan pembentukan biofilem. Penyelidikan ini mengkaji penggunaan nanozarah perak hasil sintesis daun sirih (AgNPs) yang digabungkan dengan penyinaran laser merah untuk meningkatkan keberkesanan antimikrob terhadap bakteria rintang antibiotik. Kajian ini melibatkan empat kumpulan: kumpulan kawalan (T0) tanpa penyinaran laser, kumpulan E. coli (A1 dan A2) dan kumpulan S. aureus (A3 dan A4) yang dirawat dengan pelbagai kepekatan (AgNPs) dan disinari dengan laser diod 665 nm. Kumpulan fotopemekaan (A2 dan A4) menerima AgNPs yang disintesis daripada ekstrak daun sirih merah (AgNPs-Pc), diikuti dengan eraman selama 10 min. Sampel tersebut kemudiannya disinari pada tempoh masa yang berbeza: 90, 120, 150 dan 180 min, menggunakan laser dengan panjang gelombang 665 nm untuk menilai kesan antimikrob. Hasil menunjukkan bahawa AgNPs-Pc yang digabungkan dengan laser merah secara signifikan mengurangkan pertumbuhan E. coli dibandingkan dengan kawalan tanpa fotopemekaan. Untuk S. aureus, pertumbuhan terjadi setelah sinaran tanpa fotopemekaan (PS). Sinaran ke atas S. aureus dengan AgNPs-Pc pada kepekatan 1 mM, 1.5 mM dan 2 mM selama 150 saat mengurangkan kematian bakteria masing-masing sebanyak 89.74%, 91.24% dan 89.05%. Penyahaktifan berkesan bagi E. coli adalah 87.29 ± 2.68% pada ketumpatan tenaga 22.68 J/cm². S. aureus memerlukan ketumpatan tenaga yang lebih tinggi sebanyak 37.80 J/cm² untuk penyahaktifan sebanyak 91.24 ± 2.76%. Hasil ini menunjukkan bahawa nanozarah perak hasil sintesis ekstrak daun sirih merah yang digabungkan dengan sinaran laser merah adalah berkesan untuk melawan E. coli dan S. aureus yang rintang terhadap antibiotik.

Kata kunci: Escherichia coli; fotopemekaan; laser diod merah; penyahaktifan foto; Staphylococcus aureus

 

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*Pengarang untuk surat-menyurat; email: suryanidyah@fst.unair.ac.id

 

 

 

 

 

 

 

 

           

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