Issues

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2021

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vol. 19 /

Issue 3

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I Gusti Made Sanjaya, Iffah Karimah
«Differences in Physical-Chemical Character of Red and White Galangal (Alpinia galanga) Extract in Green Synthesis of Nanosilver »
0737–0750 (2021)

PACS numbers: 68.37.Lp, 78.40.-q, 78.67.Bf, 81.05.Zx, 81.16.Pr, 83.80.Mc, 87.85.Rs

This research is carried out on the physical-chemical characteristics of red and white galangal (Alpinia galanga) extracts in green synthesis of nanosilver. The study is carried out experimentally through an extraction process followed by instrumentation measurement and then through a redox reaction of nanosilver formation followed by instrumentation measurement. The results physically show that the red-galangal and white-galangal extracts are not too different as a raw material in green synthesis of nanosilver, whereas chemically there are 10 and more bioactive compounds detected in red galangal extracts compared to white galangal extracts. The percentage of bioactive compounds from red galangal extract, which became a reducing agent in the reaction of nanosilver formation, (81%) is smaller than the percentage of bioactive compounds from white galangal extract (92%). The oxidation efficiency of bioactive compounds from red galangal extract (an average of 4.04%, except galanganol of 0.05% and ellagic acid of 9.02%) is greater than the oxidation efficiency of bioactive compounds from white galangal extract (an average of 1.79%). The diameter of the nanosilver resulting from the reduction reaction of each galangal extract on silver ions calculated based on UV–Vis spectra is almost the same, which is around 16–17 nm. This fact is corroborated by TEM results, which show that the nanosilver produced from the reaction using red galangal extract reductant has a diameter of about 8–26 nm, while the nanosilver diameter of white galangal extract is around 10–26 nm. These results indicate that the particle size of the obtained nanosilver is in accordance with the standard nanoparticle size, which is of 1–100 nm.

Keywords: physical-chemical characterization, galangal extract, green synthesis, nanosilver

https://doi.org/10.15407/nnn.19.03.737

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