Green and Sustainable Encapsulation of Guava Leaf Extracts (Psidium guajava L.) into Alginate/Starch Microcapsules for Multifunctional Finish over Cotton Gauze

Abstract

Utilization of natural products in medical textiles toward multifunctional applications without side effects is an extremely motivating goal. Herein, a novel, eco-friendly procedure was developed to introduce multifunctional cotton gauze fabrics using guava leaf powder extract. Biocompatible microcapsules composed of guava leaf powder extract and starch core and calcium-alginate (Ca-alginate) outer membrane were developed. The current strategy involved the identification and assessment of the bioactive compounds extracted from guava leaf via ultrasonic technique. Then, the guava leaf extract was loaded within a matrix of sodium alginate/starch and coated onto the cotton gauze fabrics. The morphological properties of both blank and treated cotton gauze fabrics were characterized by Fourier-transform infrared spectroscopy (FT−IR) and scanning electron microscopy (SEM). The antibacterial activity of the developed cotton gauze was evaluated against E. coli as Gram negative pathogenic bacteria and S. aureus as Gram positive pathogenic bacteria using the agar diffusion and bacterial counting methods. Furthermore, the treated cotton gauze fabrics were also used to conduct further studies toward the production of wound healing dress. The treated cotton gauze demonstrated remarkable antimicrobial, antioxidant, UV shielding, and wound healing properties. As a result, the current study presents a new simple approach to design smart cotton gauze for multifunctional medical and healthcare applications employing bioactive extract from sustainable plant waste.

A freeze–thaw PVA hydrogel loaded with guava leaf extract: physical and antibacterial properties

“…The peak at 1451 cm À1 conrms the C-H bending of the methyl groups', while the peak at 1051 cm À1 indicates the C-O-C stretch. These observations were also previously conrmed by Jeyasundari et al and Rehan et al 64,65 The PGL0 hydrogel showed absorbance peaks similar to those of PVA powder. The difference is in the width of the peak of the hydroxyl group (stretching O-H).…”

Nanosystems for the Encapsulation of Natural Products: The Case of Chitosan Biopolymer as a Matrix

“…Starch is one of the most abundant and low-cost natural polymers, it is generally recognized as GRAS and has recently used in microencapsulation of extracts such as Hibiscus sabdariffa [ 51 ] anthocyanin [ 52 ] extract. Its combined use with other natural polymers for encapsulation processes has also been investigated [ 53 , 54 , 55 ].…”

Microencapsulación de aceite esencial de pomelo en matriz de alginato-almidón y alginato-sílice

“…También fue posible la encapsulación con agregado de almidón con eficiencias y rendimientos similares a la de sílice. Otros autores también han obtenido buenos resultados en la encapsulación de extracto de la hoja de guayaba en alginato más almidón aunque no indican valores de eficiencia ni rendimiento (Rehan et al, 2019) y sin interferir el almidón con el alginato en la matriz. Tabla 1: Promedio y desvío estándar medio de eficiencia (E%) y rendimiento (R%) realizados por quintuplicado en cada caso.…”