Specifically, GS Glutamine synthetase, GOGAT Glutamate synthase, GDH glutamate dehydrogenase.
GS can be assayed spectrophotometrically. Rest other enzymes can be measured by HPLC like techniques.
You can refer the following paper for protocols for nitrate assimilating enzymes
Ali, A., Jha, P., Singh, K. S., Raghuram, N. 2008. Spirulina nitrate-assimilating
enzymes (NR, NiR, GS) have higher specific activities and are more stable than those of rice. Physiol. Mol. Biol. Plants. 14(3): 179-182.
Dear Ahmad, thanks for your information.
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