Blood storage XXIV: red blood cell 2,3-DPG and ATP maintenance for six weeks in CPD-adenine with higher phosphate, pyruvate, and dihydroxyacetone.

The individual and collective effects of various phosphate, pyruvate and dihydroxyacetone concentrations on 2,3-DPG and ATP maintenance during blood storage with CPD-adenine (0.25 mM), were studied. Phosphate concentrations ranged from 2 to 100 mM. Low concentations were best for 2,3-DPG maintenance during the first three weeks, after which there was no difference. ATP concentrations were better maintained by the highest phosphate concentrations in the first week. After the second week the lower concentrations of phosphate were better. With pyruvate 40 and 60 mM were the best for 2,3-DPG levels through six weeks of storage. ATP concentrations were poorest with high pyruvate. Maintenance of 2,3-DPG was above half normal for six weeks of storage in the 60, 80 and 100 mM DHA preservatives. ATP concentrations were best maintained in the preservative lacking DHA. Combinations of phosphate, pyruvate and DHA in concentrations which had been found to be effective when used individually were studied. Best maintenance of 2,3-DPG (above half normal levels) for six weeks was afforded by pyruvate, phosphate and DHA, and by pyruvate and DHA. ATP maintenance was best afforded by CPD-adenine alone and CPD-adenine with pyruvate and phosphate. Pyruvate alone maintained ATP less well and the pyruvate-DHA was worst. Intermediate in maintenance of ATP was the preservative containing pyruvate, phosphate and DHA.