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Introduction of Gellan Gum |
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Properties of Gellan Gum |
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Application of Gellan Gum |
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 Introduction of Gellan Gum |
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Source of Gellan Gum |
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Gellan gum (E418) is a bacterial exopolysaccharide, prepared commercially by aerobic submerged fermentation from Sphingomonas elodea (previously called Pseudomonas elodea), in a manner similar to xanthan. discovered in 1978,1988 Approved in Japan,1992 USA full approved.
Compared with other colloids, Gellan Gum has many peculiar advantages: |
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The Characteristic of Gellan Gum |
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| 1. Very Low dosage, form gel at 0.05-0.25% concentration,Gellan gum is a very effective gelling agent 2. Excellent thermal stability and acid stability 1.Little effect to gel strength after heat sterilization 2.Its powder form allows longer term of use and long-term stability even under acid condition. 3.Sodium or potassium irons can form thermal reversible gel, while Magnesium or calcium irons¡¡ |
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The Structure of Gellan Gum |
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The monosaccharide building units of gellan gum are glucose, glucuronic acid and rhamnose in the molar ratios of 2:1:1. The primary structure, a tetrasaccharide repeating unit is shown in Fig.1. In the native form of the polysaccharide, there are approximately one and a half O-acyl groups per repeating unit. Originally the O-acyl substituent was thought to be l¡¡ |
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The Production of Gellan Gum |
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| Gellan gum is produced by the bacterium Pseudomonas elodea. The gum is formed by inoculating a carefully formulated fermentation medium with this organism. The medium consists of a carbon source such as glucose, a nitrogen source and a number of inorganic salts. The fermentation is allowed to proceed under sterile conditions with strict control of aeration¡¡ |
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The Specification of Gellan Gum |
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Purity ( CO2 yielding £©% 3.3 ~ 6.8 Gel Strength g/cm2 ¡Ý 900 Transmittance % ¡Ý83 Particle Size ( Pass 80 mesh ) % ¡Ý95 Loss on Drying % ¡Ü10 Ash % ¡Ü 12 pH value ( 20¡æ ) 6-8 Isopropyl Alcohol Negative Arsenic mg/kg ¡Ü3
Lead mg/kg ¡Ü2 Total Bacterial cfu/g |
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The Analysis of Gellan Gum
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| A: Prepare a 1% solution of Gellan Gum by hydrating 1g in 99 mL of deionized water. Stir the mixture for about 2 hours, using a motorized stirrer and a propeller-type stirring blade. Draw a small amount of the solution obtained into a wide-bore pipet, and transfer it into a 10% calcium chloride solution. [Note: Reserve the remaining portion of this solution for Identification test B.¡¡ |
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The Toxicological studies of Gellan Gum
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