求翻译：目前，国内外通常采用粮食发酵法生产谷氨酸，谷氨酸主要用于生产味精（谷氨酸钠）。为分离发酵液中菌体蛋白、残糖等杂质，通常采用等电沉降和离子交换相结合的方法。是什么意思？

At present, domestic and usually the food produced by fermentation of glutamic acid, glutamic acid for the production of MSG (monosodium glutamate). For the separation of the bacterial protein in the fermentation broth, residual sugar and other impurities, usually isoelectric deposition and ion-exch

At present, the domestic and international law is generally used food fermentation glutamic acid, glutamic acid production mainly for the production of glutamate (glutamic acid). Fermented liquid separation for all proteins in bacteria, impurities, such as residual sugar, usually with electricity, s

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At present, the food production of glutamic acid by fermentation of the commonly used at home and abroad, mainly used in the production of glutamic acid monosodium glutamate (glutamate). For fermentation liquid impurities such as bacterial proteins and residual sugars, typically uses a combination o

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