About 1 g wound tissue were homogenized in 4 mL of cold 0.1 M sodium borate buffer (pH 8.8) containing 1 mM EDTA and 3% (w/v) polyvinylpyrrolidone for PAL assay and 0.05 M cold sodium
phosphate buffer (pH 7.8) containing 1 mM EDTA and 2% (w/v) polyvinylpyrrolidone for POD assay.