Preparation and Mechanism of Bio-Based Sodium Alginate Fibers with Flame Retardant and Antibacterial Properties

Abstract

Flame retardant and antibacterial sodium alginate (SA) fiber were fabricated using the bio-based flame retardant of phytic acid and DL-arginine successively, and then the morphological structures, combustion behavior, thermal stability, and mechanical as well as antibacterial properties of SA fiber were investigated carefully. It is found that when the additional amount of PADL (reaction products of phytic acid and DL-arginine) in SA composite fiber is 20 wt%, its limiting oxygen index (LOI) is 40.0 ± 0.3%, and UL−94 is V−0 grade. The combustion behavior of composite fiber shows that PADL can effectively reduce combustion heat and promote carbon formation. Its peak of HRR (pkHRR) is 5.9% of pure SA fiber, and the residual carbon increases from 23.0 ± 0.1% to 44.2 ± 0.2%. At the same time, the density of the residual carbon increases gradually. PADL can promote SA to form expanded carbon with increasing density, and isolate the heat and volatilization of combustible gases. The guanidine group of DL-arginine can interact with the cell membrane to kill bacteria, and the antibacterial property of SA composite fiber is increased by 30%. This study provides a very ecological, safe, environmentally friendly and simple method to prepare flame retardant and antibacterial SA composite fiber with bio-based materials.

Inhibitory Potential of Bifidobacterium longum FB1-1 Cell-Free Supernatant against Carbapenem-Resistant Klebsiella pneumoniae Drug Resistance Spread

“…LC-MS data revealed that organic acids constituted 74.77% of the primary antibacterial components in the CFS of B. longum FB1-1. Notably, among the antibacterial substances detected, citric acid, epirizole, DL-arginine, and betaine exhibited higher relative abundances (as presented in Table 2 ) [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

“…LC-MS data revealed that organic acids constituted 74.77% of the primary antibacterial components in the CFS of B. longum FB1-1. Notably, among the antibacterial substances detected, citric acid, epirizole, DL-arginine, and betaine exhibited higher relative abundances (as presented in Table 2) [25][26][27][28][29][30][31][32][33]. Figure 5A depicts experimental phenomena, showing that, although the inhibitory impact of high-temperature-treated CFS on CRKP was lower compared to the control, it still exhibited significant antibacterial activity, underscoring its potential as an antibacterial agent.…”

Molecular design and properties of a P‐N synergistic flame retardant epoxy resin curing agent

“…The presence of CO 2 (2362 and 669 cm −1 ) is readily discernible in the spectrum 40,41 . The presence of phosphorus‐based radicals, PO (1259 cm −1 ), can effectively quench energetic hydroxyl or hydrogen radicals generated during polymer decomposition in the gas phase, thereby interrupting flame propagation 42,43 …”