000			02267nam a22002417a 4500
001			61939811
003			CHED
005			20240430093258.0
008			200114t xxu||||| |||| 00| 0 eng d
040			_aCHED _cCHED
090			_aLG 995 2017 C6 L37
100			_aLapoot, Lloyd Mamalis
245			_aPreparation, characterization, and agricultural utilization of urea loaded chitosan and nanoparticles _cLloyd Mamalis Lapoot
260			_aLos Ba�os, Laguna _bUniversity of the Philippines Los Ba�os _c2017
300			_axii, 64 pages _ewith CD ROM _fThesis
500			_aThesis (Master of Science in Agricultural Chemistry) -- University of the Philippines Los Ba�os, June 2017
520			_aUrea-loaded chitosan nanoparticles were prepared by copolymerization of methacrylic acid with chitosan followed by the incorporation of urea into the nanoparticles. The shape of the nanoparticles is spherical as shown by the transmission electron microscopy (TEM) image. Particle size analysis revealed that the sizes of nanoparticles can change from 73.3 nm to 126 nm depending on the amount of chitosan used in the synthesis. The formation of the nanoparticles improved the stability of chitosan as shown by the differential scanning calorimetry (DSC) result. The loading efficiency of urea in the nanoparticles is 96.8+- 0.4%. The presence of urea resulted to an increase in size of the nanoparticles, presence of additional peaks in the FT-IR spectra of the CS-PMAA nanoparticles and an increase in the presence in the atomic concentration of nitrogen by 166% as revealed by the SEM-EDX result. The urea-loaded chitosan nanoparticle was tested as a foliar fertilizer for pechay (Brassica rapa cultivar Pavito) and lettuce (Lactuca sativa cultivar Estrosa). Analysis of variance for the growth parameters measured revealed that although foliar treatments of urea-loaded chitosan nanoparticle gave means higher compared to treatments containing commercial urea and the control, the difference were found to be not significant. Analysis of variance of the total nitrogen content also showed no significant among treatments.
650			_aChitosan.
650			_aNanoparticles.
650			_aUrea as fertilizers.
942			_2lcc _cCHEDFR
999			_c7298 _d7298