Nh2

Chemical formula of pentahydrate: C5H8O4Na 5H20 Molecular weight: 259.5

The condensed solution of L-Glu Na was cooled between — 0.8 and — 8.5 °C, from which pentahydrate crystals were crystallized (29). The crystal structure belongs to the tri-clinic and space group P1, and lattice constant is (30)

Figure 6. The solubility of sodium l-glutamate with change in temperature.

Figure 6. The solubility of sodium l-glutamate with change in temperature.

The crystal density is 1.480 g/cm3.

As shown in Figure 6, the transition point form monohydrate to pentahydrate is —0.8 °C. Above —0.8 °C monohydrate crystals exist as the stable form, between —0.8 and —8.5 °C, pentahydrate exists as the stable form, and below —8.5 °C the solution itself turns into ice. The solubility of pentahydrate is changeable with temperature compared to monohydrate, and is designated as follows:

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