In order to improve the gelling properties of agarose, we modified it by methylation. The agarose was prepared from Gracilaria asiatica, G. bailinae, and G. lemaneiformis with alkaline, treated with diatomaceous earth and activated car‑ bon, and anhydrous alcohol precipitation. | Modification and comparison of three Gracilaria spp. agarose with methylation for promotion of its gelling properties