Effects of photo-stimulation with laser or LED on the composition of Xanthan gum produced in media containing distilled water or dialyzed or not produced water by means of Raman spectroscopy

Antônio Luiz Barbosa Pinheiro, Paulo Fernando de Almeida, Igor Carvalho Fontes Sampaio, Pedro Jorge Louro Crugeira, Jacson Nunes dos Santos, Josilene Borges Torres Lima Matos, Luiz Guilherme P. Soares, David A. Moraga Amador, Landulfo Silveira