For Jurkat E6.1 cells, RPMI-1640 medium is commonly used. However, it's typically supplemented with sodium pyruvate and glucose. The absence of sodium pyruvate and lower glucose concentration in your current medium might affect cell growth and viability.
For optimal growth of Jurkat E6.1 cells, it's recommended to use RPMI-1640 medium supplemented with sodium pyruvate (1 mM) and glucose (4.5-5.5 g/L). These supplements provide additional energy sources and support cell metabolism.
If you're unable to obtain RPMI-1640 with the recommended supplements, you might consider adding them yourself to your current medium. However, make sure to properly prepare and filter sterilize the supplements before adding them to the medium. Additionally, you may need to optimize the concentrations based on your specific experimental requirements and conditions.