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Food additives data book - wordpres

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Polysaccharides 698<br />

NAME: Gellan<br />

CATEGORY: Polysaccharides<br />

FOOD USE: Water gels/ Dessert gels/ Pet foods/ Jams/ Dairy products/ <strong>Food</strong> packaging/ Edible films and coatings/<br />

All food products<br />

SYNONYMS: Polymer with a tetrasaccharide repeating unit composed of a beta-D-(1 Æ 3) glucopyranosyl unit,<br />

beta-D-(1 Æ 4) glucuronopyranosyl unit, beta-D-(1 Æ 4) glucopyranosyl unit and alpha-L-(1 Æ 4)<br />

rhamnopyranosyl unit with some acetyl and glycerol groups attached/ CAS 71010-52-1/ EINECS<br />

275-117-5/ E418/ Gum gellan/ Gelrite/ Kelcogel<br />

MOLECULAR MASS: 1–2 ¥ 10 6<br />

ALTERNATIVE FORMS: Salts of potassium; sodium; calcium; magnesium, etc.<br />

PROPERTIES AND APPEARANCE: White/off-white powder or soft flakes<br />

SOLUBILITY % AT VARIOUS Solubility varies with molecular weight and associated cations. Generally, not fully soluble until about<br />

TEMPERATURE/pH COMBINATIONS: 100°C in water, sucrose or sodium chloride.<br />

Solubility declines with increasing molecular weight and increasing concentration. It is not pHindependent<br />

FUNCTION IN FOODS: Gelling agent; coating in food contact surfaces; thickening agent; stabiliser; bulking agent<br />

ALTERNATIVES: Gelatin; agar; alginate; curdlan; carrageenan (application-dependent)<br />

TECHNOLOGY OF USE IN FOODS: Gellan should be dispersed in cold water and autoclaved at 121°C for 10 minutes to hydrate the<br />

polysaccharide. A high shear mixer will aid dispersion, although prolonged shear of high molecularweight<br />

polymers will reduce the viscosity.<br />

Gellan is a linear polymer of glucose molecules that forms stacked interacting double helices when<br />

heated and cooled in aqueous solution. Cations (particularly divalent cations) are required for gel<br />

formation. Synergistic interactions with gelatin and gum arabic.

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