Dear Francesca:

Try to prepare hydrogel based on slightly crosslinked High Mw Poly(Vinyl)Alcohol

Hi Francesca,

You may search at Sigma Aldrich website. The chitosan available in low, medium and high molecular weight. You may choose either one. Same goes to Hyaluronic acid. For Glycerophosphate, you may search for beta-Glycerophosphate disodium salt hydrate or Glycerol 2-phosphate disodium salt hydrate. I hope this will help you.

Hi Francesca

In addition to the previous answers and if you want the same materials with the same properties, they have mentioned the name and location of each company in the paper after each material name. Just search in the companies' websites.

Thanks all for your answers.

I did both the things Siti Hajar Saharudin and Amir Mohammed Alsharabasy suggested. However, what I was looking for was different.

Basically, in the study Zhang et al. said they used specific molecular weights and deacetilation degree (this just for chitosan) for HA and chitosan. I was wondering how they got these compounds with those specific weights since in the main chemical company websites you can usually buy them in a range of Mw. But actually they simply tested their compounds with GPC and got those Mws.

Unfortunately, since in my lab they do not have these machines, I have to switch to another project because I would not have been able to test the mechanical and chemical properties of these materials.

Thanks all again!

You can ask the company for more details about the polymers you want to buy. Moreover, in general the M. Wt of polymers is expressed as average M. Wt (number or weight), so just take the confirmation from the company about the avg M. Wt of the patch you will buy and this can solve a part of the problem.

Good luck