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Choline chloride\u2013malonic acid (CCMA) and choline chloride\u2013lactic acid (CCLA) were used to obtain high purity \u03b1-chitin from ball-milled P. henslowii exoskeleton in 2 h at 120 \u00b0C, with yields of 12.05 \u00b1 2.54% and 12.8 \u00b1 1.54%, respectively. The physical and chemical characteristics of the obtained chitins were assessed using CHN elemental analysis, attenuated total reflectance\u2013Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. Furthermore, the CCLA solvent was reusable three times with little effect on the extract purity, and calcium lactate was produced at the end of the recycling cycles. The ensuing calcium lactate was also characterized in terms of chemical and physical properties. The obtained chitin is a promising raw material for downstream processing and the double valorization pathway with the obtention of calcium salts may increase the viability of a DES-based approach for the processing of mineralized substrates.<\/jats:p>","DOI":"10.3390\/md20110717","type":"journal-article","created":{"date-parts":[[2022,11,17]],"date-time":"2022-11-17T06:19:01Z","timestamp":1668665941000},"page":"717","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Double Valorization for a Discard\u2014\u03b1-Chitin and Calcium Lactate Production from the Crab Polybius henslowii Using a Deep Eutectic Solvent Approach"],"prefix":"10.3390","volume":"20","author":[{"given":"Colin","family":"McReynolds","sequence":"first","affiliation":[{"name":"Universite de Pau et des Pays de l\u2019Adour, E2S UPPA, IPREM, CNRS, 64 600 Anglet, France"},{"name":"MANTA\u2014Marine Materials Research Group, Universite de Pau et des Pays de l\u2019Adour, E2S UPPA, 64 600 Anglet, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amandine","family":"Adrien","sequence":"additional","affiliation":[{"name":"Universite de Pau et des Pays de l\u2019Adour, E2S UPPA, IPREM, CNRS, 64 600 Anglet, France"},{"name":"MANTA\u2014Marine Materials Research Group, Universite de Pau et des Pays de l\u2019Adour, E2S UPPA, 64 600 Anglet, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7465-4977","authenticated-orcid":false,"given":"Arnaud","family":"Petitpas","sequence":"additional","affiliation":[{"name":"Universite de Pau et des Pays de l\u2019Adour, E2S UPPA, IPREM, CNRS, 64 600 Anglet, France"},{"name":"MANTA\u2014Marine Materials Research Group, Universite de Pau et des Pays de l\u2019Adour, E2S UPPA, 64 600 Anglet, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laurent","family":"Rubatat","sequence":"additional","affiliation":[{"name":"Universite de Pau et des Pays de l\u2019Adour, E2S UPPA, IPREM, CNRS, 64 600 Anglet, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1295-5010","authenticated-orcid":false,"given":"Susana C. 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