Abstract The integral valorisation of discarding potatoes from three local varieties using processes of low environmental impact to recover the starch contained in the flesh as well as the bioactive compounds present in the skin or in the processing wastewaters was studied. The remaining flesh after starch extraction was also recovered to further processing. The extraction of starch and active extracts using environmentally friendly technologies, the physicochemical and phytochemical characterisation of the extracts, the formulation and mechanical characterisation of the corresponding functional hydrogels, have allowed proposing potential food and non-food applications. Results indicated that subcritical water extraction (220 °C) was an efficient technology to recover antioxidants from the potato skin. Processing wastewaters exhibited high protein content. The extracted starch featured comparable physicochemical properties to that available commercially and the corresponding hydrogels exhibited enhanced mechanical properties with absence of syneresis. It should be remarked that Agria and Neiker varieties provided the highest total starch and bioactive content in terms of phenolics, TEAC value and DPPH inhibition percentage, respectively.

中文翻译：

---

废弃马铃薯的生物精炼概念：淀粉和生物活性化合物的回收

摘要 研究了使用对环境影响低的过程来回收果肉中含有的淀粉以及表皮或加工废水中存在的生物活性化合物，从而丢弃来自三个地方品种的马铃薯的整体价值。淀粉提取后剩余的果肉也被回收用于进一步加工。使用环保技术提取淀粉和活性提取物，提取物的物理化学和植物化学表征，相应功能水凝胶的配方和机械表征，已允许提出潜在的食品和非食品应用。结果表明，亚临界水提取（220°C）是一种从马铃薯皮中回收抗氧化剂的有效技术。处理废水表现出高蛋白质含量。提取的淀粉具有与市售淀粉相当的物理化学特性，相应的水凝胶表现出增强的机械性能，没有脱水收缩。应该注意的是，Agria 和 Neiker 品种分别在酚类、TEAC 值和 DPPH 抑制百分比方面提供了最高的总淀粉和生物活性含量。