Assessment of concentrations of toxic elements in aquaculture food products in Malaysia

Mok, Wen Jye; Senoo, Shigeharu; Itoh, Tomohiro; Tsukamasa, Yasuyuki; Kawasaki, Ken-íchi; Andô, Masashi

doi:10.1016/j.foodchem.2012.02.011

Cited by 45 publications

(26 citation statements)

References 15 publications

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“…Lead concentration in roasted corn (Zea mays) was in the range 5.75-8.14 ± 0.41 mg/kg ( Figure 3). This is higher than that observed by Mok which was 0.066-0.831 ± 0.229 ppm [37]. Lead in roasted corn (Zea mays) was the highest concentration observed in all the sample points analyzed.…”

Section: Resultscontrasting

confidence: 56%

Metals in Some Ready-to-Eat Foods on Some Highways of Lagos and Ota South-West Nigeria

Onipede¹,

Rahman²

2017

J Environ Anal Chem

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This research determined the concentration of Lead (Pb) and Cadmium (Cd) in roasted corn (Zea mays), roasted plantain (Musa paradisiaca) and barbecue from roadside close to industrial and automobile emission in some selected parts of Lagos and Ota, South-West Nigeria. They were analysed after digestion by Atomic Absorption Spectrophotometry (AAS). Lead had the highest concentration in all the food type analyzed and was higher than FAO permissible limit (0.3 mg/kg) in about 92% of the samples analyzed. It was also found to be higher in the samples from Lagos than those from Ota. While Cadmium had relatively lower concentration compared with Lead in all the food samples but about 25% of the samples analyzed had higher concentration than the FAO permissible limit (0.5 mg/kg). The results showed that the order of the concentration of Lead in the food samples was corn>barbecue>plantain, while the order of the Cadmium concentration in the food samples was in the order corn>plantain>barbecue. Continual consumption of roasted corn, roasted plantain and barbecue close to highway and industrial emission may therefore constitute a source of exposure to these heavy metals.

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Section: Resultscontrasting

confidence: 56%

Metals in Some Ready-to-Eat Foods on Some Highways of Lagos and Ota South-West Nigeria

Onipede¹,

Rahman²

2017

J Environ Anal Chem

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“…Hence these microalgae have gained considerable attention from industry and their large scale cultivations have been conducted (Khan et al 2005). However, As contamination in water may pose risks to the quality of microalgal products (Mok et al 2012;Smedley and Kinniburgh 2002). Moreover, lower members of the trophic level such as micro-and macro-algae may accumulate As more efficiently than the higher trophic levels (García-Salgado et al 2012a;Maeda et al 1983), causing contamination of algal products and threats to human health.…”

Section: Introductionmentioning

confidence: 99%

Review of arsenic speciation, toxicity and metabolism in microalgae

Wang

et al. 2015

Rev Environ Sci Biotechnol

162

100

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Arsenic is a toxic metalloid and its pollution has become a global environmental problem. This paper reviewed the current knowledge on the speciation, toxicity and metabolism of arsenic in microalgae. A number of arsenic species are present in various microalgae. Due to the great toxicity of inorganic arsenic, microalgae may undergo different processes to reduce the arsenic toxicity, including cell surface binding, arsenite [As(III)] oxidation, arsenate [As(V)] reduction, methylation, transformation into arsenosugars or arsenolipids, chelation of As(III) with glutathione and phytochelatins, as well as excretion from cells. Several genes and enzymes involved in arsenic transformations have been identified and characterized. Many factors, especially nutrient elements (e.g., nitrogen and phosphorus) in cells and in culture, affect arsenic metabolic pathways of microalgae. Arsenic metabolism in the unicellular algae has gained considerable interest because these processes control not only the effectiveness of arsenic phycoremediation, but also the risk of arsenic contamination in algal products. Future research need to focus on (1) the regulative mechanisms of arsenic absorption, biotransformation and excretion at molecular level; (2) the effects of intracellular nutrient dynamics on arsenic speciation; (3) the impacts of culture regime on the arsenic metabolism in microalgae; (4) the transfer of arsenic species across aquatic food web in order to better evaluate the roles of microalgae in arsenic cycling.

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“…According to Mok et al (2012), mariculture products yield higher Cd than aquaculture products, which reflect the existence of Cd in seawater. Cd exists naturally in trace level in zinc and lead ores.…”

Section: Resultsmentioning

confidence: 99%

“…Studies on the nutrient content of Malaysian K. alvarezii, previously known as Eucheuma cottonii, were reported by Matanjun et al (2009) and Mok et al (2012), where its proximate, fatty acid, and amino acid composition were analyzed. However, there was a discrepancy in the results, and analyses were limited to farm-propagated seaweeds only.…”

Section: Introductionmentioning

confidence: 99%

Chemical composition of farmed and micropropagated Kappaphycus alvarezii (Rhodophyta, Gigartinales), a commercially important seaweed in Malaysia

Yong

et al. 2014

J Appl Phycol

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Micropropagation technologies play an important role in enhancing the nutritional composition of seaweeds. Kappaphycus alvarezii explants, obtained from two types of seedling production system viz. micropropagation and farm propagation, were analyzed. Results obtained from the postfarm cultivation seaweeds showed significantly higher total lipids in micropropagated compared to farm-propagated K. alvarezii. In the mineral and trace element analyses, micropropagated K. alvarezii yielded significantly higher calcium, magnesium, beryllium, cobalt, copper, lithium, manganese, and zinc compared to farm-propagated K. alvarezii. A lower concentration of metal contaminants was detected in micropropagated K. alvarezii compared to farm-propagated K. alvarezii. Both sources of K. alvarezii showed high SFA compared to MUFA and PUFA, where C16:0 and C18:0 were found to be in abundance. The study suggests micropropagated K. alvarezii is a better food source for consumption compared to farm-propagated K. alvarezii and justifies the rationale of using micropropagation technique for seedling production in the seaweed industry.

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Assessment of concentrations of toxic elements in aquaculture food products in Malaysia

Cited by 45 publications

References 15 publications

Metals in Some Ready-to-Eat Foods on Some Highways of Lagos and Ota South-West Nigeria

Metals in Some Ready-to-Eat Foods on Some Highways of Lagos and Ota South-West Nigeria

Review of arsenic speciation, toxicity and metabolism in microalgae

Chemical composition of farmed and micropropagated Kappaphycus alvarezii (Rhodophyta, Gigartinales), a commercially important seaweed in Malaysia

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