Comparative study on the physicochemical properties of κ-carrageenan extracted from Kappaphycus alvarezii (doty) doty ex Silva in Tawau, Sabah, Malaysia and commercial κ-carrageenans

摘要: κ-Carrageenan is a linear, sulphated polysaccharide that widely used in the food industry as gelling agent due to its lack of toxicity and biocompatibility. In this study, physicochemical properties κ-carrageenan (TA150) derived from Kappaphycus alvarezii (formerly Eucheuma cottonii) Tawau, Sabah were investigated compared commercial (SeaKem CM611, Gelcarin GP812, GP911 NF, Grindsted® carrageenan CL220). TA150 exhibited lowest lightness but highest yellowness, with L∗ b∗ values reported 82.69 17.16, respectively. The rupture strength increased significantly increasing concentration (p 90%) under all storage temperatures (25 °C, 4 °C −18 °C). moisture content, ash, acid-insoluble matter, sulphate levels samples 3.65–11.41%, 17.75–33.18%, 0.22–3.74%, 12.00–19.71%, These low fat, protein, crude fibre contents. potassium content was GP812 (100.42 g/kg), followed by CL220 (61.92 (54.60 NF (40.90 g/kg) SeaKem CM611 (15.76 g/kg). No heavy metals detected other except for lead. However, lead fell within acceptable ranges (<5 mg/kg) set Joint FAO/WHO Expert Committee on Food Additives (JECFA).