Figure 6
From: Rheoreversible hydrogels in paper restoration processes: a versatile tool
HPLC analysis. HPLC chromatograms of the extracts in water of RS before and after cleaning treatment with traditional and hydrogel proposed methods. In insert: detail of chromatogram, region between 4 and 10 minutes before cleaning treatment (1), and after treatment with water (2), with PLU hydrogel (3) or with PEO hydrogel (4). STRATA-SAX separation and concentration of the acid components of each analyzed sample (before and after cleaning treatment) were performed before the chromatographic analysis.