The intake of either NPJ or HPJ led to a decrease in urinary 8-hydroxy-2 ' - deoxyguanosine ( NPJ : 935 134 to 298 19 ng/mg creatinine ; HPJ : 749 84 to 285 17 ng/mg creatinine ) , 8-iso-prostaglandin F2 ( NPJ : 437 68 to 156 14 ng/mg creatinine ; HPJ : 347 43 to 154 13 ng/mg creatinine ) , erythrocyte catalase , and glutathione reductase activities .