Studies on antibacterial efficacy of ZnO nanoparticles using Tanner's Cassia flower extract from green synthesis

Padmasree, G.; Anuradha, K.; Kumar, Amit; Pragadeeswari, G.

doi:10.1016/j.matpr.2023.04.149

Cited by 2 publications

(1 citation statement)

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“…In contrast, for ZnO-100 ( Figure 4 c), larger agglomerates composed of smaller particles (20–40 nm) were detected. The presence and content of the E. crassipes extract did not exert a significant effect on the shape of the particles, as similar morphologies have been reported for ZnO when zinc nitrate is used in combination with other plant extracts [ 32 , 33 ]. It is important to note that nanoparticles exhibit different behaviors depending on the media in which they are applied.…”

Section: Discussionsupporting

confidence: 61%

Antifungal Activity of ZnO Nanoparticles Synthesized from Eichhornia crassipes Extract for Construction Applications

Vargas Hernández,

Alvarez Lemus,

De la Rosa García

et al. 2024

Nanomaterials

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Fungal growth on construction materials in tropical climates can degrade aesthetics and manifestations on modern and historical sick buildings, affecting the health of their inhabitants. This study synthesized ZnO nanoparticles with enhanced antifungal properties using a precipitation method. Different concentrations (25%, 50%, and 100%) of Eichhornia crassipes aqueous extract were used with Zn(NO3)2·6H2O as the precursor to evaluate their spectroscopic, morphological, textural, and antifungal properties. X-ray diffraction confirmed the hexagonal wurtzite phase of ZnO with crystallite sizes up to 20 nm. Fourier-transform infrared spectroscopy identified absorption bands at 426, 503, and 567 cm−1 for ZnO-100, ZnO-50, and ZnO-25, respectively. Nitrogen physisorption indicated a type II isotherm with macropores and a fractal dimension coefficient near 2 across all concentrations. Polydispersity index analysis showed that ZnO-50 had a higher PDI, indicating a broader size distribution, while ZnO-25 and ZnO-100 exhibited lower PDI values, reflecting uniform and monodisperse particle sizes. FESEM observations revealed semi-spherical ZnO morphologies prone to agglomeration, particularly in ZnO-25. Antifungal tests highlighted ZnO-25 as the most effective, especially against Phoma sp. with an MFC/MIC ratio of 78 µg/mL. Poisoned plate assays demonstrated over 50% inhibition at 312 µg/mL for all tested fungi, outperforming commercial antifungals. The results indicate that ZnO NPs synthesized using E. crassipes extract effectively inhibit fungal growth on construction materials. This procedure offers a practical approach to improving the durability of building aesthetics and may contribute to reducing the health risks associated with exposure to fungal compounds.

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Section: Discussionsupporting

confidence: 61%