2.6.1.16 can be concentrated by precipitation with 2.3 M ammonium sulfate with some concomitant loss of activity 639919 2.6.1.16 complete loss of activity after treatment with ammonium sulfate, 30-50% saturation 639921 2.6.1.16 dithiothreitol, D-fructose 6-phosphate, D-glucose 6-phosphate or L-glutamine, 1 mM, increases thermal stability at 37°C 639921 2.6.1.16 extremely unstable during purification 639931 2.6.1.16 freezing and thawing has no effect on activity 639921 2.6.1.16 glucose 6-phosphate, 12 mM, required as protective agent during purification 639920 2.6.1.16 inactivated by freezing and thawing 639904 2.6.1.16 inactivated when exposed to a solution of pH 5.5 or below 639904 2.6.1.16 isopropanol, 1%, stabilizes during purification 639925 2.6.1.16 sucrose needed as stabilizing agent 639913 2.6.1.16 very unstable 639904