Table 1

Stability of phosphoglycerate mutase (PGM) isoenzymes in human heart extract incubated in plasma and serum

			% Activity of isoenzymes
Incubation medium	Time	Total activity	MM	MB	BB
The activity of the isoenzymes is expressed as a percentage of the total activity on electrophoretogram.
Plasma at 0°C	0 minutes	100	39	40	21
	12 hours	100	40	43	17
	24 hours	100	39	41	20
	48 hours	100	35	54	11

Plasma at 37°C	0 minutes	100	50	36	14
	12 hours	57	20	63	17
	24 hours	35	3	74	23
	48 hours	23	0	51	49

Serum at 37°C	0 minutes	100	52	43	5
	4 hours	47	34	44	22
	24 hours	35	23	58	19
	48 hours	22	12	64	24

Preheated serum (60°C, 30 minutes) at 37°C	0 minutes	100	56	39	5
	4 hours	–	28	61	11
	24 hours	–	18	68	14
	48 hours	22	11	71	18