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Caption : figure s1. chromatograms of the pashs obtained with the columns poroshell120 c18 and pursuit 3 pah at 235 nm.

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Caption : figure s2. chromatographic peaks in the presence of acn, methanol and thf at 235 nm.

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Caption : figure s3. chromatographic profiles for different temperatures at 235 nm.

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Caption : figure s4. typical chromatogram after recovery experiments at 230 nm.