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6 September 2024 Using Rose Bengal-Decorated Silica Nanoparticles as Photosensitizers for Control of Two Stored Product Insects and a Study of Their Elemental Composition1
Radwa G. Attia, Salwa A. Rizk, Ahmed Radwan
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Abstract

Cigarette beetles Lasioderma serricorne (Fabricius, 1792) and saw-toothed grain beetles Oryzaephilus surinamensis (Linnaeus, 1758) are considered serious stored grain pests. Developing silica nanoparticles (SNs) coated with the most effective and persistent photosensitizer is a viable alternative to current synthetic chemical pesticides. Chemical characterization confirmed the conjugation process between SNs and rose bengal (RB) and formation of SNs photosensitizer rose bengal (SNP-RB). Additionally, bioassays were performed to determine the impact of the median-lethal concentration (LC50) of the three substances against pests. The corresponding LC50 values against L. serricorne and O. surinamensis were 5.14, 20.32, 50.60 and 9.79, 28.93, 106.29 for SNP-RB, SNs and RB respectively. Therefore, the toxicity of these tested compounds after three hours of sun light exposure could be descendingly arranged in order as follows: SNP-RB, SNs and RB.

The relative percentages of mineral contents were detected in the whole body tissue of L. serricorne and revealed the existence of nine elements in untreated adults, 11 elements in adults treated with RB as well as nine elements in adults treated with SNP-RB. Silicon was the least abundant element in both controls as well as adults treated with SNP-RB, Sulphur was the least abundant element in adults treated with RB and carbon was detected as the most abundant element in all treatments. Considering O. surinamesis, ten elements existed in untreated adults, 11 elements in adults treated with RB, whereas ten elements were found in adults treated with SNP-RB. Carbon was the most abundant element in all treatments, whereas calcium appeared as the least abundant element in SNP-RB.

Radwa G. Attia, Salwa A. Rizk, and Ahmed Radwan "Using Rose Bengal-Decorated Silica Nanoparticles as Photosensitizers for Control of Two Stored Product Insects and a Study of Their Elemental Composition1," Entomological News 131(4), 193-213, (6 September 2024). https://doi.org/10.3157/021.131.0403
Received: 13 June 2023; Accepted: 14 September 2023; Published: 6 September 2024
KEYWORDS
elemental composition
Lasioderma serricorne
Oryzaephilus surinamensis
photosensitizer
Silica nanoparticles
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