Subcellular distribution and chemical forms of cadmium in the edible seaweed, Porphyra yezoensis

• Published in: Food chemistry Vol. 168; pp. 48 - 54
• Main Authors: Zhao, Yanfang, Wu, Jifa, Shang, Derong, Ning, Jinsong, Zhai, Yuxiu, Sheng, Xiaofeng, Ding, Haiyan
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.02.2015; Elsevier
• Subjects: Biological and medical sciences; Cadmium; Cadmium - analysis; Cell Wall - chemistry; Chemical and industrial products toxicology. Toxic occupational diseases; Chemical form; Food Contamination - analysis; Food toxicology; Medical sciences; Metals and various inorganic compounds; Porphyra - chemistry; Porphyra yezoensis; Seaweed - chemistry; Subcellular distribution; Tolerance mechanism; Toxicology; Cadmium ion (PubChem CID: 31193); Dithiothreitol (PubChem CID: 19001); Cadmium; Cadmium dichloride (PubChem CID: 24633); Chemical form; Acetic acid (PubChem CID: 176); Tolerance mechanism; Porphyra yezoensis; Sucrose (PubChem CID: 5988); Cadmium oxalate (PubChem CID: 3083647); Sodium chloride (PubChem CID: 5234); Cadmium phosphates (PubChem CID: 26060); Ethanol (PubChem CID: 702); Subcellular distribution; Organo-ligands (PubChem CID: 11403475); Rhodophyta; Algae; Chemical compound; Porphyra; Tolerance; Transition metal; Bangiophyceae; Heavy metal; Edible alga; Distribution; Mechanism of action
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2014.07.054

•Subcellular distribution and chemical forms of Cd in P. yezoensis is little known.•The majority of Cd was localised in cell walls for both control and treatment groups.•Most Cd was found dominant in 1M Nacl extractable fractions for the control group.•Most Cd was found dominant in 2% HAC extractable fractions for the treatment groups. The subcellular distribution and chemical forms of Cd were investigated in the edible seaweed, Porphyra yezoensis. The seaweed was exposed to different Cd concentrations (0.01, 0.05, 0.1, 0.5, 1.0 and 5.0mgl−1) for up to 96h. In both the controls (no Cd added) and treatment groups, 41.2–79.2% of Cd was localised in the cell wall, and the proportion of Cd in the cell wall increased with increasing concentrations of Cd and exposure time. In the control groups, 74.8% of Cd was extracted by 1M NaCl, followed by 2% acetic acid, HAC (18.9%). In the treatment groups, most Cd was extracted by 2% HAC. The proportion of Cd extracted by 2% HAC increased with exposure to increasing concentrations of Cd and over time. Cell wall deposition and forming of precipitates with phosphate may be a key strategy to reduce Cd toxicity in P. yezoensis.