The widespread use of disposable plastic straws has caused a long-lasting environmental problem. Potential alternatives for plastic straws are far from satisfactory due to the low utility, poor water stability, and non-ideal natural degradability. In this work, an edible, hydrostable, and degradable straw was developed from the economically significant seaweed. Seaweed-derived insoluble cellulose fibers were used as the building block of the straw, and the soluble polysaccharide extracts were explored as the natural glue through the chelation with Ca. Repeated freeze-thawing was introduced to strengthen the molecular interactions, which further improved its mechanical stability and hydrostability. The straw exhibited remarkable natural degradability in open environments, particularly in marine-mimicking conditions. By incorporating pH-sensitive food pigments, the straws could indicate acid-base property of a beverage or even discriminate the freshness of milk. The versatile seaweed-derived straw adhered to the biocycle concept of “from sea to sea” to alleviate the burden of white pollution on oceans.

中文翻译：

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从海洋到海洋：基于海藻衍生的不溶性纤维素纤维和可溶性多糖的可食用、耐水和可降解的吸管

一次性塑料吸管的广泛使用造成了长期的环境问题。由于效用低、水稳定性差和自然降解性不理想，塑料吸管的潜在替代品远不能令人满意。在这项工作中，从经济上具有重要意义的海藻中开发出了一种可食用、耐水且可降解的秸秆。海藻衍生的不溶性纤维素纤维被用作秸秆的组成部分，可溶性多糖提取物通过与钙螯合探索作为天然胶。反复冻融增强了分子相互作用，进一步提高了其机械稳定性和水稳定性。该秸秆在开放环境中表现出显着的自然降解性，特别是在模拟海洋条件下。通过加入对pH值敏感的食用色素，吸管可以指示饮料的酸碱特性，甚至可以辨别牛奶的新鲜度。多功能海藻秸秆秉承“从海洋到海洋”的生物循环理念，减轻海洋白色污染的负担。