B5 Interactions With Other Food Ingredients

MC and HPMC products are nonionic and are not precipitated as insoluble salts by multivalent metal ions. However, they can be salted out of solution when the concentration of electrolytes or other dissolved materials exceeds certain limits, as shown in Table 7B.4. This is caused by competition of the electrolytes for water and results in reduced hydration of these gums (The Dow Chemical Co., 1988). Water-insoluble materials, such as certain pigments or flavoring oils, do not adversely affect the gums. On the other hand, as MC and HPMC gums are not soluble in concentrated salt or sugar solutions, these media can be used as nonsolvent dispersing media. Subsequent dilution reduces the salt or sugar concentration to a level that allows the gum to dissolve and become fully functional.

Table 7B.4 Grams of Additive Tolerated by 100 ml of 2% Solutions of Methocel® Gums at 20°C

Methocel® Premium gum types

Table 7B.4 Grams of Additive Tolerated by 100 ml of 2% Solutions of Methocel® Gums at 20°C

Methocel® Premium gum types

Additive (g/100 ml)

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