EFFECT OF TEMPERATURE, PH AND ADDITIVES ON THE RATE OF DICHLORVOS INSECTICIDE RELEASE FROM STARCH SILVER NANOPARTICLES ENCAPSULATE.

Authors

  • N. E. Ihegwuagu Author
  • R. Sha’Ato Author
  • T. A. Tor-Anyiin Author
  • L. Nnamonu Author
  • B. Sone Author
  • M. Maaza Author

Keywords:

Insecticide, release, starch, nanoparticle, Dichlorvos

Abstract

The encapsulation of widely used organophosphorus insecticide in Nigeria; dichlorvos, was achieved in situ on to cassava starch nano silver particle matrices with the aim to produce more effective, cheaper and safer slow/controlled delivery formulation than conventional pesticide formulations over a longer time. The starch -silver nanoparticle matrices was synthesized during the chemical reduction of silver nitrate by glucose employing direct heating. The starch-silver nanoparticles encapsulation of dichlorvos (CVNPsVOS) was confirmed by UV-Vis spectroscopy and characterized by HR-TEM, FESEM, FTIR, and XRD. The characteristic Surface Plasmon Resonance (SPR) at 418nm. The XRD results revealed silver diffraction peaks at 2θ angles in the formulation. Encapsulation efficiency was 95% for CVNPsVOS better than control having no silver (NativeVOS). Nano[1]formulations showed an enhanced aqueous release over the control. Their HR-TEM and FESEM images analysis indicated spheres with an average particle size range of 23nm– 35nm. FTIR also confirmed the loading of dichlorvos with additional peaks corresponding to them while Control had none. The effect of temperature on release showed (20 oC > 30 oC), pH (4.0 >9.0 > 6.5) and additives (Tween 20, Triton X-100 and peanut oil) showed an order TW (50%) >PO (48%) >TX (41%). This current synthetic/encapsulation process can be scaled up as slow release formulations with silver nanoparticles acting as anti-microbial agent also.

Author Biographies

  • N. E. Ihegwuagu

    Agricultural Research Council of Nigeria, Plant Resources Department (PRD), Agricultural Research House, Mabushi, P. O. Box 5026, Wuse, Abuja-Nigeria. 

    Chemistry Department & Centre for Agrochemical Technology, University of Agriculture, P.M.B. 2373, Makurdi, Benue State, Nigeria.

  • R. Sha’Ato

    Chemistry Department & Centre for Agrochemical Technology, University of Agriculture, P.M.B. 2373, Makurdi, Benue State, Nigeria.

  • T. A. Tor-Anyiin

    Chemistry Department & Centre for Agrochemical Technology, University of Agriculture, P.M.B. 2373, Makurdi, Benue State, Nigeria.

  • L. Nnamonu

    Chemistry Department & Centre for Agrochemical Technology, University of Agriculture, P.M.B. 2373, Makurdi, Benue State, Nigeria.

  • B. Sone

    UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk ridge, P.O. Box 392, Pretoria-South Africa,

    Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West 7129, POBox 722, Somerset West, Western Cape Province, South Africa. 

  • M. Maaza

    UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa, Muckleneuk ridge, P.O. Box 392, Pretoria-South Africa,

    Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West 7129, POBox 722, Somerset West, Western Cape Province, South Africa.

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Published

2024-05-04

Issue

Vol. 34 No. 2 (2020)

Section

Articles