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Gellan gum

Gellan gum is a water-soluble polysaccharide produced by Sphingomonas elodea, a bacterium
Gellan gum, also known commercially as Phytagel or Gelrite, is used primarily as a gelling agent, alternative to agar, in microbiological culture. It is able to withstand 120 °C heat, making it especially useful in culturing thermophilic organisms. One needs only approximately half the amount of gellan gum as agar to reach an equivalent gel strength, though the exact texture and quality depends on the concentration of divalent cations present. Gellan gum is used as gelling agent in plant cell culture on petri-dishes, as it provides a very clear gel, facilitating light microscopical analyses of the cells and tissues. Although advertised as being inert, experiments with the moss Physcomitrella patens have shown that choice of the gelling agent - agar or Gelrite - does influence phytohormone sensitivity of the plant cell culture.

Item	Specification	Result
PH(1% solution)	4.0-7.0	6.4
Ash	15.0% Max	11.0%
Loss on drying	6-14%	7.0%
Particle size through 80(150 micron)	99% Min	100%
Particle size through 100 mesh(150 micron)	97% Min	100%
Transmittancy	74% Min	85%
Isopropyl Alcohol	750ppm Max	30ppm
Heavy Metals	20.0ppm Max	2.5ppm
Lead	2.0ppm Max	0.4ppm
Arsenic	3.0ppm Max	0.3ppm
Bacteria	10000CFU/g Max	1000CFU/g
Mold	400CFU/g Max	<50CFU/g
Coliform	MPN/100g	Complies
S.aureus	Absent in 1.0g	Complies
P.aeruginosa	Absent in 1.0g	Complies