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The microspheres were encapsulated using polyethylene glycol and 1\u2010hexadecanol to form a sustained\u2010release SP tablet. Micromorphology, active ingredient loading, structure identification, photolysis resistance and biological activity were evaluated in this report.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>RESULTS<\/jats:title>\n                    <jats:p>\n                      (i) The SP microspheres had an average particle size of 6.16\u2009\u00b1\u20092.28\u2009\u03bcm, low adhesion and good dispersion as evaluated by scanning electron microscopy and morphology. (ii) The average active ingredient loading and encapsulation of SP microspheres were 32.80\u2009\u00b1\u20090.74% and 78.41\u2009\u00b1\u20092.22%, respectively. (iii) The chemical structure of encapsulated SP was confirmed by Fourier transform infrared and\n                      <jats:sup>1<\/jats:sup>\n                      H\u2010nuclear magnetic resonance. (iv) The photostability of the microspheres and the tablets were evaluated. The results showed that DT\n                      <jats:sub>50<\/jats:sub>\n                      (time required to dissipate 50% of the mass originally present) of SP was 0.95\u2009days in microspheres and 6.94\u2009days in tablets. (v) The long\u2010term insecticidal activity of SP tablets was investigated, and the tablet had a long\u2010lasting activity against the mosquito larvae, showing 100% larval mortality for 63\u2009days.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>CONCLUSIONS<\/jats:title>\n                    <jats:p>\n                      The study provided a new long\u2010lasting formulation of SP, which displayed good efficacy in the control of\n                      <jats:italic>Ae.\u2009aegypti<\/jats:italic>\n                      larvae. \u00a9 2024 Society of Chemical Industry.\n                    <\/jats:p>\n                  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