Nanomaterials
Blackberry-leaf silver nanoparticles against plant pathogens
Open access · cc by · source: Europe PMC
Rubus fruticosus extract reduces Ag+ to 50–120 nm AgNPs (SPR 449 nm) that fully inhibit two phytopathogens at the highest dose.
Study at a glance
- Design
- Animal / in-vitro — Plant-extract AgNP synthesis with antibacterial titration against plant pathogens and DPPH assays
- N
- Materials/antimicrobial assay study — no sample N
- Population
- Ralstonia solanacearum and Erwinia carotovora cultures exposed to Rubus-derived AgNPs
- Outcome
- Pathogen inhibition and antioxidant activity of biogenic AgNPs
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
SPR at 449 nm (stable 4 months). XRD peaks at 38.1°, 44.4°, 54.5°, 77.9°. TEM 50–120 nm. EDX ~90% Ag at 3 keV. Highest NP dose gave 100% inhibition of both pathogens; lower doses still beat extract alone.
Methodology
Authors mixed leaf extract with AgNO3, confirmed SPR, XRD, TEM and EDX, then titrated nanoparticles versus Ralstonia solanacearum and Erwinia carotovora, plus DPPH antioxidant assays.
Limitations
Field efficacy, mammalian toxicity, and a fully assigned capping-molecule structure are not established; ‘T1–T10’ doses need the paper’s table to translate to µg mL−1.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Powder XRD of silver colloids is a phase fingerprint, not a molecular structure. Blackberry-leaf Ag nanoparticles show peaks at 38.1°, 44.4°, 54.5° and 77.9° with TEM diameters 50–120 nm and SPR at 449 nm. Glutathione-capped Ag stirred at 60 °C is fcc; TEM diameters grow 3.20 → 4.83 → 6.19 nm at 36, 48 and 72 h while SPR sits at 344–354 nm.
Evidence for the claim as stated.
A powder pattern of a colloid and a single-crystal structure of a molecule are not the same XRD experiment. Fcc Ag peaks at 38.1–77.9° identify a metal phase and roughly a size regime; they do not give a coordination number, a space group of a molecular hydrate, or an E/Z ratio. Quoting 'XRD confirmed the structure' without saying powder versus single-crystal erases that.
Evidence for the claim as stated.
Stirring time is another TEM-readable size knob. Glutathione-capped Ag at 60 °C grows TEM diameters 3.20, 4.83 and 6.19 nm at 36, 48 and 72 h as fcc metal forms and SPR appears at 344–354 nm. Blackberry-leaf Ag is much larger by TEM (50–120 nm) with SPR at 449 nm — same metal, different length scale, both still images of dried particles.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
A powder pattern of a colloid and a single-crystal structure of a molecule are not the same XRD experiment. Fcc Ag peaks at 38.1–77.9° identify a metal phase and roughly a size regime; they do not give a coordination number, a space group of a molecular hydrate, or an E/Z ratio. Quoting 'XRD confirmed the structure' without saying powder versus single-crystal erases that.
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