Abstract Fungal stains affect documents and artworks on paper all over the world, diminishing their chemical stability and compromising their readability. The present paper studies the suitability of agarose and gellan gum hydrogels to remove fungal stains from paper, using paper impregnated with alizarin as a model system to simulate the most common colorant molecules produced by fungi - polyketide quinones. The effect of pH variation on the efficacy of the gels was evaluated by UV spectrometry. The results show that the cleaning efficacy of the gels greatly depends on the gel matrix, the colorant molecules, and the pH balance of the process.

中文翻译：

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用水凝胶清洁纸上的真菌污渍：pH 控制的影响

摘要 真菌污渍影响世界各地的文件和纸上艺术品，降低其化学稳定性并影响其可读性。本论文研究了琼脂糖和结冷胶水凝胶去除纸上真菌污渍的适用性，使用浸渍茜素的纸作为模型系统来模拟真菌产生的最常见的着色剂分子——聚酮醌。通过紫外光谱法评估pH变化对凝胶功效的影响。结果表明，凝胶的清洁效果很大程度上取决于凝胶基质、着色剂分子和过程的 pH 平衡。