PDF(Pubmed)
Abstract：
This research aimed to produce eco-friendly straws using soy protein isolate (SPI) and cassava starch (CS) at different ratios by the extrusion technique and by coating with beeswax and shellac wax. Three straw formulations (F) (F1: 24.39% SPI-24.39% CS; F2: 19.51% SPI-29.37% CS; and F3: 14.63% SPI-34.15% CS) were prepared, incorporating glycerol (14.6% w/w) and water (36.6% w/w). After extrusion and drying at 80 °C for 20 h, visual assessment favored F2 straws due to smoother surfaces, the absence of particles, and enhanced straightness. For the physical property test, the straws were softened in pH buffer solutions for 5 min. To simulate practical application, mechanical bending strength was studied under different relative humidity (RH) settings. Water absorption reduced the strength as RH increased. F2 straws outperformed other formulations in bending strength at 54% RH. For hydrophobic coatings, F2 was chosen. Beeswax- and shellac wax-coated straws displayed negligible water absorption and sustained their integrity for over 6 h compared to uncoated straws. This study shows that extrusion and natural coatings may make sustainable straws from SPI and CS. These efforts help meet the growing demand for eco-friendly plastic alternatives, opening up new options for single-use straws.
摘要：
这项研究旨在通过挤出技术以及用蜂蜡和虫胶蜡涂覆，以不同比例使用大豆分离蛋白（SPI）和木薯淀粉（CS）生产环保秸秆。制备了三种秸秆配方（F）（F1：24.39％SPI-24.39％CS；F2：19.51％SPI-29.37％CS；和F3：14.63％SPI-34.15％CS），结合甘油(14.6%w/w)和水(36.6%w/w)。挤出并在80°C下干燥20小时后，由于表面更光滑，视觉评估有利于F2吸管，没有粒子，和增强的直线度。对于物理性能测试，将吸管在pH缓冲溶液中软化5分钟。为了模拟实际应用，研究了不同相对湿度(RH)设置下的机械弯曲强度。随着RH的增加,吸水率降低了强度。F2吸管在54%RH下的弯曲强度优于其他配方。对于疏水涂层，选择F2。与未涂覆的吸管相比，涂有Beeswax和虫胶蜡的吸管显示出可忽略的吸水率，并且保持了超过6小时的完整性。这项研究表明，挤出和天然涂料可以从SPI和CS制造可持续的秸秆。这些努力有助于满足对环保塑料替代品日益增长的需求，为一次性吸管开辟了新的选择。
