Fig. 1.
Surface plots showing the effects of the urea concentration and the extraction temperature on the peak area of four prototypic peptides (p level < 0.05). a α S1 CN-FFVAPFPEVFGK. b β LG-ALPMHIR. c Ova-HIATNAVLFFGR. d Lys-FESNFNTQATNR
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