2.1. Materials
The LGRA106 and LGRA107 genotypes of L.gracilis Schauer were obtained from the Active Germplasm Bank and donated by the Department of Agronomical Engineering of Federal University of Sergipe, São Cristóvão, Brazil. To obtain the EOs, the leaves were dried at 40 ± 1 °C in an air-circulated oven for 5 days, and the oils were then extracted by hydrodistillation using Clevenger equipment for 140 min (Melo et al., 2013). Chitosan, in the powder form (particle size 80 mesh, deacetylation degree 85.9%, pH 8.2), was obtained from Polymar ciência e nutrição S/A (Fortaleza-CE, Brazil). The cassava starch of ‘Dinha Bá’ mark was purchased from the local market. Guavas were purchased from the Municipal Market of Aracaju, SE, and were chosen to ensure uniformity in size and peel colouration (yellow with green traces).