color produced by the ketose sugar. The L-fuculose o-nitro-phenylhydrazone produced a high intensity color and is the derivative of L-fuculose. L-fuculose also had produced this high intensity color, while the aldose form, L-fucose, produced a very low intensity color. When comparing both of these isomers to the standard, it was clear that the product that also produced an intense color formation was the ketose sugar, L-fuculose.

Formation

As mentioned previously, L-fucose isomerase can interconvert between the two isomers

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