Généralement les réactions d'oxydation sont lente

Acid catalyzed kinetics of oxidation of glycine by chloramine the order with respect to glycine is one .

Of course, you can assume that the reaction order with respect to glycine is one. However, if you really want to know, you need appropriate data. I recommend the method of initial reaction rates to determine the exact reaction order. Usually, only the reaction order of elemental reactions is an integer. Here, it can be also 1.15 or anything else.