Resumo

ORJUELA-PALACIO, Juliana M.; PEREZ-CALDERON, John  e  ZARITZKY, Noemí E.. Synthesis of chitosan nano-encapsulates as a carrier system for phytosanitary products. Cienc. Tecnol. Agropecuaria [online]. 2023, vol.24, n.1, e2823.  Epub 30-Abr-2023. ISSN 0122-8706.  https://doi.org/10.21930/rcta.vol24_num1_art:2823.

Allicin is an active compound with antimicrobial activity, antioxidants and is highly effective against insects. Chitosan (Qs) is a polycationic biopolymer that forms nanoencapsulates by interacting with sodium tripolyphosphate (TPP). The synthesis of nanoencapsulates as Allicin carrier systems with phytosanitary effects is of interest to the agricultural field. Therefore, in this study nanoencapsulates were synthesized by Ionotropic gelation and then were characterized. The synthesis consists in: i) Formulation of All:Qs complexes that contain 0.2 g of All per 1 g Qs, using Qs (1%w/v) and a commercial phytosanitary with All concentration of 0.6% w/v. (ii) Obtaining the NQsAll systems using the ionotropic gelation technique by adding TPP (0.6 mg mL) to the All:Qs complex in two proportions NQsAll (5:1) and (3:1). FTIR-ATR spectra were obtained, observing the bands corresponding to the sulfoxide groups (1119 cm-1 ) and to the stretching vibration of the primary amines (1072 cm-1 ) linked to All. The electrostatic interaction of the amino groups of Qs with TPP was checked. The mean particle diameter (Dm) by dynamic light distribution and Z-Potential (PZ) were determined; TPP:Qs ratio significantly influenced, being NQsAll(5:1) the most stable, showing the smallest size (PZ=0,67 mV Dm=144.6±6.4 nm). The antioxidant capacity was evaluated by the percentage of inhibition of DPPH•; results indicated that nanoencapsulation preserved the antioxidant capacity of the complex. NQsAll(5:1) showed the best performance to formulate a nano-carrier for a phytosanitary compound. These nano-carrier systems can be a helpful alternative for the conservation of allicin; increase dispersion and wettability during crop application.

Palavras-chave : Allicin; Antioxidant capacity; Biopolymers; Ionotropic gelation; Particle diameter.

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