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- Title
Improved biological effects of uniconazole using porous hollow silica nanoparticles as carriers.
- Authors
Tan, Wei-Ming; Hou, Ning; Pang, Sen; Zhu, Xiao-Feng; Li, Zhao-Hu; Wen, Li-Xiong; Duan, Liu-Sheng
- Abstract
BACKGROUND: The aim of this work is to prepare a controlled-release formulation of uniconazole using porous hollow silica nanoparticles (PHSNs) as carrier, and to investigate the biological effects on rice growth. RESULTS: PHSNs with a shell thickness of ∼15 nm and a particle size of 80-100 nm were synthesised through a sol-gel route using nanosized calcium carbonate particles as templates. Simple immersing (SI) and supercritical fluid drug loading (SFDL) technologies were employed to load uniconazole into PHSNs with loading efficiencies of ∼22 and ∼26% respectively. The prepared uniconazole-loaded PHSNs (UCZ-PHSNs) by SI and SFDL both demonstrated sustained release properties, and the latter showed better controlled release ability with a slower release rate. Compared with free uniconazole, UCZ-PHSNs exhibited a weaker growth retardation effect in the early stage but more significant retardation ability in later stages for agar-cultured rice seedlings. For the rice that grew in clay, UCZ-PHSNs demonstrated a weaker plant height retardation effect than free uniconazole at the early jointing stage by foliar spraying, but exhibited a stronger retardation capacity than free uniconazole by being applied into soil before seedling transplantation. CONCLUSION: The results indicated that the prepared UCZ-PHSNs possessed good controlled-release properties and had improved retardation effects on rice growth. It is recommended that UCZ-PHSNs be applied into soil before seedling transplantation rather than administered by foliar spraying at the early jointing stage. Copyright © 2011 Society of Chemical Industry
- Subjects
NANOPARTICLES; CALCIUM carbonate; IMMERSION in liquids; SPRAYING &; dusting in agriculture; APPLICATION of pesticides; CONTROL of agricultural pests &; diseases
- Publication
Pest Management Science, 2012, Vol 68, Issue 3, p437
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.2288