Food Safety and Preservation Department, IATA-CSIC, Avda. Agustín Escardino 7, 46980 Paterna, Valencia, Spain.
Food Safety and Preservation Department, IATA-CSIC, Avda. Agustín Escardino 7, 46980 Paterna, Valencia, Spain.
Carbohydr Polym. 2020 Apr 1;233:115887. doi: 10.1016/j.carbpol.2020.115887. Epub 2020 Jan 16.
The residues generated after the extraction of agar from Gelidium sesquipedale by means of a hot-water treatment, with (NaOH+HW residue) and without (HW residue) an alkali pre-treatment have been valorized to produce high performance cellulosic films. Both residues were mainly composed of structural carbohydrates (in particular, agar), ashes and lipids. The residual agar could only be completely removed by applying a two-step process based on bleaching and alkaline treatments. The application of the alkaline pre-treatment for the extraction of agar did not significantly affect the properties of the films produced from the extracted fractions, hence making the HW residue more sustainable and economically viable. The agar remaining in the less purified fractions had a positive effect on the performance of the films, improving their transparency, mechanical properties and water vapour barrier, outperforming benchmark biopolymers; in addition, these materials presented antioxidant capacity inhibiting the degradation of β-carotene.
利用热水处理从鹿角菜中提取琼脂后产生的残渣（NaOH+HW 残渣）和未经碱预处理的残渣（HW 残渣）已被利用来生产高性能纤维素薄膜。两种残渣主要由结构碳水化合物（特别是琼脂）、灰分和脂质组成。只有通过基于漂白和碱性处理的两步法才能完全去除残留的琼脂。在提取琼脂的碱预处理应用中，不会显著影响从提取部分生产的薄膜的性能，因此使 HW 残渣更具可持续性和经济可行性。留在较未纯化部分的琼脂对薄膜的性能有积极影响，提高了它们的透明度、机械性能和水蒸气阻隔性能，优于基准生物聚合物；此外，这些材料具有抗氧化能力，可以抑制β-胡萝卜素的降解。
