Strawberries (Fragaria xannanasa) are susceptible to mechanical, physical, and physiological damage, which increases their incidence of rot during storage. Therefore, a method of protection is necessary in order to minimize quality losses. One way to achieve this is by applying polymer coatings. In this study, multisystem coatings were created based on polymer nanocapsules loaded with Lippia graveolens essential oil, and it was found to have excellent optical, mechanical, and water vapor barrier properties compared to the control (coating formed with alginate and with nanoparticles without the essential oil). As for the strawberries coated with the multisystem formed from the polymer nanocapsules loaded with the essential oil of Lippia graveolens, these did not present microbial growth and only had a loss of firmness of 17.02% after 10 days of storage compared to their initial value. This study demonstrated that the multisystem coating formed from the polymer nanocapsules loaded with the essential oil of Lippia graveolens could be a viable alternative to preserve horticultural products for longer storage periods.

In this study, a simple, and eco-friendly high-performance liquid chromatography-diode array detection (HPLC-DAD) method was developed and validated for analyzing methylxanthines, including theobromine (TB), theophylline (TF), and caffeine (CF). This method demonstrated excellent performance using an isocratic mobile phase of water (85%) and ethanol (15%) at 0.1 mL min–1, 25 °C in a core–shell Kinetex® C18 column. The method was linear (1–100 μg mL–1), exhibiting high precision and accuracy with relative standard deviations below 2.67% and recoveries ranging from 98.15% to 108.88%. The detection and quantification limits ranged from 0.19–0.26 μg mL–1 and 0.64–0.87 μg mL–1, respectively. We applied this method to analyze powdered lemon-flavored beverages enriched with black or green tea extracts. CF was detected exceeding 1.62 g kg–1. The proposed method showed excellent greenness, evidenced by the Analytical Eco-Scale, Analytical GREEnness metric (AGREE) calculator, and GAPI.