Produção de Glutamato Monossódico (MSG) por Fermentação
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O realçador de sabor umami produzido por fermentação bacteriana
Visão geral
Monosodium glutamate (MSG) is produced by aerobic fermentation of Corynebacterium glutamicum on sugar substrates, followed by crystallization of the sodium salt. Discovered by Kikunae Ikeda in 1908 as the compound responsible for umami taste, MSG is now the most produced amino acid worldwide. The fermentation process was developed in the 1950s, replacing the original hydrolysis of wheat gluten or soy protein. China produces over 60% of the world's MSG supply.
Processo químico
Corynebacterium glutamicum is grown aerobically on glucose or cane molasses at 30-37 degrees C for 30-40 hours, secreting L-glutamic acid into the broth at concentrations up to 150 g/L. The broth is acidified to precipitate glutamic acid crystals at pH 3.2 (isoelectric point), which are then dissolved, neutralized with NaOH, and recrystallized as MSG monohydrate.
L-Glutamic acid + NaOH → MSG + H₂O
Matérias-primas
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Glucose or cane molasses — Corn wet milling or sugar refining (Carbon source)
-
Ammonium sulfate ((NH₄)₂SO₄) — Chemical synthesis (Nitrogen source)
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Sodium hydroxide (NaOH) — Chlor-alkali process (Neutralization agent)
Produtos finais
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MSG monohydrate (C₅H₈NNaO₄·H₂O) — Flavor enhancer (umami) (Food-grade, >99% purity)
Environmental Impact
Fermentation wastewater has high nitrogen and BOD content. The ammonium sulfate mother liquor from crystallization can be used as fertilizer. Modern plants achieve 85-90% substrate conversion, minimizing waste. Some facilities use biogas from wastewater treatment for energy recovery.
Considerações de segurança
- ⚠ Handling of concentrated acids and bases during purification
- ⚠ Ammonia gas exposure risk during fermentation
- ⚠ Crystalline MSG dust can irritate respiratory tract
- ⚠ Bioreactor aseptic operation requirements
Inovações recentes
Metabolic engineering has produced C. glutamicum strains with glutamate yields exceeding 50% of theoretical maximum.
Continuous fermentation with cell recycling membrane bioreactors improves productivity and reduces batch turnaround time.
Escala de produção
3500000
toneladas/ano
$6.2 billion
valor de mercado
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