丙烯酰胺(AA)和5-羟甲基糠醛(HMF),对人类有潜在的致癌作用,通常是在食品的热加工过程中产生的。本研究首先使用分子对接模型来模拟四种乳酸菌肽聚糖(PGN)与AA/HMF的结合行为,并在体外评估了基于LAB的PGN与AA/HMF的结合率。计算机模拟结果表明,相互作用能是导致LAB衍生的PGN吸附到AA/HMF的驱动力。体外结果表明,乳酸双歧杆菌B1-04的PGN结合最多AA(28.7%)和HMF(48.0%),其次是嗜酸乳杆菌NCFM,B.breveCICC6079和植物乳杆菌CICC22135。此外,由于吸附,通过AFM和SEM观察到乳酸双歧杆菌B1-04的细胞表面上的AA/HMF结合层。XPS分析表明,所选菌株对AA/HMF的去除率与C-O比例呈正相关,C=O,和PGN的N-H基团。原子O1,O2,O3,O4,N1,N2,N3,H1和H2参与LAB基PGN对AA/HMF的吸附。因此,衍生自这四种乳杆菌菌株的PGN可以被认为是用于结合AA/HMF的天然吸附剂。
Acrylamide (AA) and 5-hydroxymethylfurfural (HMF), which are potentially carcinogenic to humans, are often produced during the hot processing of foods. This study first used a molecular docking model to simulate the binding behavior of four lactic acid bacteria peptidoglycans (PGNs) to AA/HMF, and the binding rate of LAB-based PGNs to AA/HMF was evaluated in vitro. In silico results show that interaction energy is the driving force responsible for the adsorption of LAB-derived PGNs to AA/HMF. In vitro results showed that the PGN of B. lactis B1-04 bound the most AA (28.7%) and HMF (48.0%), followed by L. acidophilus NCFM, B. breve CICC 6079, and L. plantarum CICC 22135. Moreover, an AA/HMF-bound layer on the cell surface of B. lactis B1-04 was observed via AFM and SEM due to adsorption. XPS analysis indicated the removal rate of AA/HMF by selected strains was positively correlated with the proportion of C-O, C=O, and N-H groups of PGNs. The atoms O1, O2, O3, O4, N1, N2, N3, H1, and H2 are involved in the adsorption of LAB-based PGNs to AA/HMF. Thus, the PGNs derived from these four Lactobacillus strains can be regarded as natural adsorbents for the binding of AA/HMF.