MUMBAI, India, Aug. 10 -- Intellectual Property India has published a patent application (202641037293 A) filed by Indian Institute Of Technology Madras Iit Madras on March 26, 2026, for A Method For Preparing Calcium Oxalate Monohydrate From Fish Scales.
Inventors include Kundanati, Lakshminath; Ramakrishnan, Swaminathan; and Devara, Venkata Krishna.
The application for the patent was published on July 31, 2026, under issue no. 31/2026.
Abstract: ABSTRACT A METHOD FOR PREPARING CALCIUM OXALATE MONOHYDRATE FROM FISH SCALES The present disclosure discloses a method for preparing calcium oxalate monohydrate from fish scales, the method comprising: a. pre-treating fish scales to 5 obtain pretreated fish scales; b. grinding the pretreated fish scales to obtain fish scale powder; c. preparing a ternary deep eutectic solvent by mixing choline chloride, oxalic acid dihydrate, and a solvent system comprising water, ethylene glycol, triethylene glycol, acetic acid, citric acid, or combinations thereof; d. combining the fish scale powder with the ternary deep eutectic solvent to obtain a 10 mixture; and e. heating the mixture to obtain the calcium oxalate monohydrate. The present disclosure further discloses a ternary deep eutectic solvent composition for extracting calcium from fish scales and a calcium oxalate monohydrate obtained by the process as disclosed herein. 26
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