Trace elements in crayfish: Regional differences and changes induced by cooking

Abstract

The concentrations of Pb, Cd, Zn, Cu, Ni, Cr, Mn, Co, As, and Se were determined in the abdominal muscle and hepatopancreas from raw and cooked crayfish of Astacus astacus (L.) and Pacifastacus leniusculus (Dana), both of Swedish origin. After cooking, the concentrations of Cd, Ni, and Co in the hepatopancreas showed a decrease and the concentrations of Pb, Cu, and Mn in the abdominal muscle showed an increase. Metal and metalloid concentrations were also determined in the abdominal muscle and hepatopancreas of commercially caught and cooked crayfish, including Astacus leptodactylus (Esch.) and Procambarus clarkii (Girard), from China, Spain, Sweden, Turkey, and USA. Most of the elements showed little variation except for cadmium in the abdominal muscle of P. leniusculus from California, which was markedly higher (mean = 0.082 mg/kg) than the others (mean = 0.004 mg/kg). Metal and metalloid concentrations in hepatopancreas varied greatly within as well as between countries. In the hepatopancreas from P. leniusculus from a Swedish lake the manganese concentrations were markedly higher than in any other crayfish. The intake of cadmium from crayfish inhabiting uncontaminated waters will be low if the hepatopancreas is not consumed.

Trace element concentrations in red swamp crayfish (Procambarus clarkii) and surface sediments in Lake Preola and Gorghi Tondi natural reserve, SW Sicily

“…Previous studies have been demonstrated that the process of cooking crayfish tails could affect trace metal concentrations. In particular, after cooking the concentrations of Cd and Ni showed decreases while the concentrations of Pb, Cu and Zn showed increases (Jorhem et al 1994; All these limits expressed in fresh weight have been converted to mg/kg dry weight, assuming a water content of 70 % in crayfish (Rigler and Downing 1984); thus, they were divided by a factor of 3.3…”

Bioaccumulation and Effects of Heavy Metals in Crayfish: A Review

“…A similar pattern was observed in Cambarus bartoni (Bagatto and Alikhan 1987c). Marine decapods such as crabs (Charybdis longicollis), lobsters (Panulirus inflatus), and shrimp (Penaeus sp., Pleoticus muelleri, and Metapenaeus affinis) appear to have similar zinc accumulation patterns, with the hepatopancreas as the Results originally given as the concentration in a wet weight were recalculated to dry weight with the water content set at 80% for abdominal muscle and 72% for hepatopancreas (Jorhem et al 1994) b Concentration from an unpolluted (or reference) locality c Values less than the detection limit were replaced with the detection limit in calculation main storage organ (Darmono and Denton 1990;Marcovecchio 2004;Páez-Osuna et al 1995;Méndez et al 1997;Pourang and Amini 2001;Pourang et al 2004;Firat et al 2008). Most zinc was accumulated in the gills during laboratory toxicity tests in the crayfish (Lindhjem and Bennet-Chambers 2002;Martín-Díaz et al 2006).…”

Cadmium in blood and urine--impact of sex, age, dietary intake, iron status, and former smoking--association of renal effects.

“…The intake from tea, coffee, and juice was estimated from data reported by Jorhem et al (1984), and used for calculation of the total intake. The Cd concentration of different foods was extracted from the literature, using Swedish data Sundström 1993, 1995;Jorhem et al 1984Jorhem et al , 1994, except for coarse-grained, whole-meal rye bread and butter, for which German data were used (Müller et al 1996). Twenty-eight persons reported use of vitaminerals.…”