Download (4Mb) - Etheses - Saurashtra University

Chapter IV Thermal Studies of …..
Figure: 4.7 a,b,c Thermo-grams of different amount of DL-methionine doped KDP
crystals
It has been observed that initially the crystal gives up the water of
hydration and remains in that form up to end of the analysis. One can see
from the thermo- grams that on increasing amount of doping the dehydration
as well as the phase transition process starts early and the crystals becomes
anhydrous faster than the pure KDP. Since amino acid becomes unstable at
lower temperatures, it weakens KDP crystals and as a result the dehydration
process takes place earlier and faster with comparison to pure KDP crystal.
This also proves that the amino acid has entered the KDP crystal in a doped
form. The similar nature was observed for L-arginine [18], L-alanine [19] and
L-lysine [20] doped KDP crystals.
170