Assertion: l tryptophan | /r/HasAspect | high purity
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Source sentences:
text: More specifically, L-tryptophan formed by the enzymatic process inevitably contains impurities such as cells, materials used for culturing and various proteins and L-tryptophan having a high purity can hardly be obtained, and since it is relatively difficult to separate the enzyme from formed L-tryptophan, it is difficult to use the enzyme repeatedly.