Potensi Pemaparan Light Emitting Diode (LED) Inframerah Untuk Fotoinaktivasi Bakteri Bacillus subtilis
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Penelitian ini bertujuan untuk mengetahui pengaruh pemaparan cahaya LED inframerah pada fotoinaktivasi bakteri Bacillus subtilis dengan cara melakukan uji potensi untuk mengetahui panjang gelombang yang sesuai dengan spektrum serap fotosensitiser bakteri Bacillus subtilis. Selain itu dilakukan uji optimasi untuk menentukan jarak dan waktu pemaparan yang efektif pada proses fotoinaktivasi bakteri Bacillus subtilis dengan variasi jarak 1,5 cm, 2cm, dan 3cm serta variasi waktu 5 menit, 10 menit, 15 menit dan 20 menit. Penelitian ini menggunakan metode TPC (Total Plate Count) untuk menghitung jumlah kematian koloni bakteri akibat pemaparan. Hasil penelitian menunjukkan bahwa LED inframerah dengan panjang gelombang 950 nm berpotensi untuk fotoinaktivasi bakteri Bacillus subtilis. Dan efek pemaparan yang paling efektif adalah pada jarak 1,5 cm pada waktu 15 menit dengan prosentase kematian sebesar 53%.
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