Król Żaneta, Malik Magdalena, Marycz Krzysztof, Jarmoluk Andrzej
Department of Animal Products Technology and Quality Management, Wroclaw University of Environmental and Life Sciences, Chelmonskiego 37/41, 51-630 Wroclaw, Poland.
Faculty of Chemistry, Wroclaw University of Technology, Smoluchowskiego 23, 50-370 Wroclaw, Poland.
Polymers (Basel). 2016 Jul 30;8(8):275. doi: 10.3390/polym8080275.
The aim of the study was to investigate the effect of using direct electric current (DC) of 400 mA for five minutes on the physiochemical properties of gelatine (2%, 4%, and 8%), carrageenan (1.5%, 2%, and 2.5%) and sodium alginate (0.75%, 1%, and 1.25%) hydrosols with different sodium chloride concentration. The pH, oxidation-reduction potential (ORP), electrical conductivity (EC), available chlorine concentration (ACC) and rheological parameters were measured. Moreover, Fourier transform infrared spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM) analysis were carried out. The results have shown that pH, ORP, EC and ACC values are changed upon applying DC and the magnitude of change depends on the concentration of the polymer and the addition of sodium chloride. After seven days of storage, the ACC of the samples exposed to DC decreased by 88%⁻96%. The FT-IR spectra demonstrated that the structure of gelatine, carrageenan and sodium alginate are not significantly affected by DC. Furthermore, the use of DC did not affect the flow and gelation temperature of the hydrosols. These results suggest that the use of DC did not cause undesirable changes in hydrosols layer and these innovative materials can be used, e.g., for food preservation.
本研究的目的是调查使用400毫安直流电5分钟对不同氯化钠浓度的明胶（2%、4%和8%）、卡拉胶（1.5%、2%和2.5%）以及海藻酸钠（0.75%、1%和1.25%）水溶胶的理化性质的影响。测量了pH值、氧化还原电位（ORP）、电导率（EC）、有效氯浓度（ACC）和流变学参数。此外，还进行了傅里叶变换红外光谱（FT-IR）和扫描电子显微镜（SEM）分析。结果表明，施加直流电后，pH值、ORP、EC和ACC值会发生变化，变化幅度取决于聚合物的浓度和氯化钠的添加量。储存七天后，暴露于直流电的样品的ACC下降了88%⁻96%。FT-IR光谱表明，明胶、卡拉胶和海藻酸钠的结构未受到直流电的显著影响。此外，使用直流电不会影响水溶胶的流动和凝胶化温度。这些结果表明，使用直流电不会在水溶胶层中引起不良变化，这些创新材料可用于例如食品保鲜。
