Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia.
Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia.
Food Chem. 2019 Nov 15;298:125014. doi: 10.1016/j.foodchem.2019.125014. Epub 2019 Jun 22.
Natural red purple dye, Betanin, was extracted from the beetroot, purified by aqueous two- phase extraction and gel permeation column chromatography, and used as a reducing agent for the synthesis of silver-betanin core-shell triangular nanodisks for the first time. Spectroscopic data show that the nanoparticle structure is core@shell like with Ag as core and betanin as shell. Langmuir monolayer model (q = 32.4 mg/g, R = 0.99 and R = 0.997) was the best fit adsorption isotherm for the dye removal. Adsorption kinetics is well explained by pseudo-second-order equation. Gibbs free energy (ΔG = -2.59 kJ mol), enthalpy (ΔH = 18.05 kJ mol), and entropy (ΔS = 68.92 J/K/mol) were calculated and discussed. The antibacterial activity of betanin-AgNPs were determined against Escherichia coli MTCC-450 (E. coli) and Staphylococcus aureus MTCC-3160 (S. aureus) bacteria.
天然红色素甜菜红，通过水相双相萃取和凝胶渗透色谱柱层析从甜菜根中提取出来，首次被用作合成银-甜菜红核壳三角纳米盘的还原剂。光谱数据表明，纳米颗粒结构为核壳型，Ag 为核，甜菜红为壳。Langmuir 单层模型（q=32.4mg/g，R=0.99 和 R=0.997）是最适合用于去除染料的吸附等温线。吸附动力学很好地解释了拟二级方程。计算并讨论了吉布斯自由能（ΔG=-2.59kJ/mol）、焓（ΔH=18.05kJ/mol）和熵（ΔS=68.92J/K/mol）。测定了甜菜红-AgNPs 对大肠杆菌 MTCC-450（E. coli）和金黄色葡萄球菌 MTCC-3160（S. aureus）细菌的抗菌活性。
