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Comparative Study of PAMAM G4NH2-Ag and G4OH-Ag Nanocomposites on Arthrospira platensis after Various Conditions

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Abstract:

The purpose of this study is to investigate the effect of PAMAM G4NH2-Ag and G4OH-Ag nanocomposits on algae (cyanobacterium) Arthrospira platensis (spirulina) as a model at various conditions using UV-visible spectroscopy. It is known that the efficiency of energy production in photosynthetic microorganisms is partly determined by light absorption. In our case, we observed an increase in absorption in the region corresponding to chlorophyll a under various conditions when PAMAM G4NH2-Ag and PAMAM G4OH-Ag nanocomposits were added to spirulina. From these data, we may conclude that the photoactivity of chlorophyll a in spirulina is enhanced through the action of PAMAM G4NH2-Ag and PAMAM G4OH-Ag nanocomposits in vivo. This effect persisted regardless of dendrimer type, spirulina fermentation, freezing at different temperatures, or high-dose irradiation followed by re-cultivation.

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Periodical:

Key Engineering Materials (Volume 1028)

Pages:

89-96

DOI:

https://doi.org/10.4028/p-1Cmmko

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Online since:

October 2025

Authors:

Eter Gelagutashvili*, Tamar Giorgadze, Vasil Bregadze, Irine Khutsishvili

Keywords:

Arthrospira platensis, G4OH, PAMAM Dendrimers G4NH2, Silver Nanocomposites

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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