Role of CaCO3 in the physicochemical properties of crustacean-sourced structural polysaccharides

Organic and mineral acid demineralizations: effects oncrangonandLiocarcinus vernalis– sourced biopolymer yield and properties

“…Results showed that for each shell, the DA, thermal stability, crystallinity and hydrogen bond strength of extracted reduced as the concentration of HCl increased. Earlier studies [19] affirm that CaCO 3 is more predominant and strongly bonded to embedded chitin in the crab shell than that of the shrimp. Ameh et al [16] were able to successfully study shrimp shell demineralization kinetics with CH 3 CH (OH) COOH using the shrinking core model.…”

“…A greater quantity (57.1%) is observed for CH 3 COOHD shrimp chitin between 342°C and 417°C with no evidence of CaCO 3 existence. This shows chitin -CaCO 3 bond is weaker in shrimp shell compared to that in crab shell [19] hence, CH 3 COOH will completely isolate chitin from shrimp shell. In addition to this, a much reduced CaCO 3 content of 18.9% observed between 665°C and 713°C may have further enhanced its easy removal by this organic acid.…”

“…Chitin extracted from crab shell with HCl possesses DA of 90.7%. Increasing amount of acetyl groups (function of increasing DA) imparts improved resistance to thermal, chemical [19] and mechanical degradation [25] on the biopolymer with shrimp chitin having the better property of the two shells. More detailed OH and NH (3600-3000 cm −1 ) groups are exhibited by HClD crab chitin sample compared to that observed in the CH 3 COOHD crab chitin and the virgin sample (Figure 2(a)).…”

Research progress on applications of calcium derived from marine organisms

“…Crustacean processing and consumption generate 30–40% of marine resource waste 29 . Crustacean shells mainly comprise calcium carbonate (CaCO 3 ), chitin, and protein 30 . Research on shrimp and crab shells have mainly focused on the utilization of chitin and protein resources, while calcium is sometimes recycled as a by-product, such as calcium hydrogen phosphate, calcium lactate, and calcium 31 .…”

“…Marine biological calcium has biological functions other than improving calcium homeostasis and bone health. For example, coral calcium was shown to regulate blood pressure and prevent the metastasis of colon cancer 30 , 73 , 74 . Calcium spirulan, derived from Spirulina platensis ( Arthrospira platensis ), a filamentous blue-green microalga from rivers and lakes, was shown to inhibit herpes simplex virus 1 actively, and possibly, infections caused by other herpesviruses 75 .…”