Page 6 - NRG of commercial importance

ril0tAt li$rult [r ilmru ntslils At[ Gllils

yielding trees xre Ac.lcta dlotica habul), A They decompose completelr on heating
'rat""l"i '
(khair), Steruculia urens (kullu), without melting and tend to become
Anogeissru btifotia (dhau.ra), Butea nwnospffi'rr chared'
Galas), Bauhinia retusa (semal), Lannea o Most gums emanate from plants in a
ccromandelicn (Iendia), and Azalirachta indica hquid form. They dry up into ffanslucent,
(neem). Gum is also etitracted from seeds of amorphous, tear*haped bodies or flakes
certain plants like guar, tamarind, cassia tora on contactwith air.
etc. Guar gum is the prominent seed based
natural gum. Gum'resins
Gum-resins are a mixture of both gurns and
The principal characteristics ofgums are:
r They consist of polysaccharides or their resins and possess the properties of both the
groups. They contain traces of essential oils.
deriatives. These are usuah derived from the plant
r They are soluble in water or at least growing in dry and arid regions. Some of the
become soft and swollen when mixed commonly used gum-resins ale asafoetida,
with water. However they are insoluble in
mynh, salai, guggul etc.
alcohol and other organic solvens.

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