An environment friendly technique for green synthesis of silver nanoparticles has been reported. Silver nanoparticle have been synthesized using water extract of leaves of pucuk idat (Cratoxylum glaucum), commonly known as local Bangka plant. The flavonoid and tannin present in the extract act as reducing agent. AgNO3 0,05 M solution was reducing using the extract at room temperature by stirring. Color changing of the solution was detected at 30 minutes reaction time. The color tends to be darker by the increasing of reaction time. Various techniques used to characterize synthesized nanoparticles are UV-Visible spectrophotometer, x-ray diffraction (XRD) and scanning electron microscopy (SEM). UV-Visible spectrophotometer showed absorbance peak in 405 nm, the XRD shows that silver nanoparticles formed are crystalline. The average particle size of Ag nanoparticles estimated from the Scherrer formula is 35,59 nm, while SEM image shows shape of silver nanoparticle is random and some spherical shape.

Telah dilakukan sintesis nanopartikel perak menggunakan bioreduktor ekstrak daun pucuk idat (Cratoxlum glaucum) menggunakan metode iradiasi microwave. Sintesis dilakukan dengan mereaksikan ekstrak daun pucuk idat dengan larutan perak nitrat pada perbandingan komposisi 1:2. Variabel penelitian ini yaitu variasi konsentrasi perak nitrat dan waktu sintesis. Berdasarkan hasil analisis UV-Vis menunjukkan adanya serapan panjang gelombang maksimum yang merupakan karakteristik pembentukan nanopartikel perak pada panjang gelombang 398,8 nm dengan konsentrasi AgNO3 0,5 mM dan waktu sintesis 120 detik. Analisis ukuran partikel menunjukkan distribusi ukuran partikel sebanyak 10% berukuran 92,5 nm dan secara keseluruhan berukuran 544,1 nm. Hasil uji aktivitas antibakteri menunjukkan nanopartikel perak memiliki sifat antibakteri yang kuat terhadap bakteri E.coli dan S.aureus