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researcher of umami Kikuna carried a large amount of kelp into his laboratory and took out a kelp soup.

he tried various methods, such as further boiling down the kelp soup and adding chemicals.

Corrections · 3

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in 1907 he successfully extracted about 30 g of sodium glutamate, which is the source of umami, from about 38 kg of kelp soup.Umami seasoning was developed from this glutamate in 1909.This is Ajinomoto.Currently, this Ajinomoto is widely used as home taste in about 100 countries.
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a isn't needed before kelp soup and a comma after as.
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researcher of umami

Kikuna carried a large amount of kelp into his laboratory and took out  kelp soup.

he tried various methods, such as, further boiling down the kelp soup and adding chemicals.

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