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https://www.readbyqxmd.com/read/29476233/speciation-analysis-of-arsenic-in-seafood-and-seaweed-part-ii-single-laboratory-validation-of-method
#1
Mesay Mulugeta Wolle, Sean D Conklin
Single laboratory validation of a method for arsenic speciation analysis in seafood and seaweed is presented. The method is based on stepwise extraction of water-soluble and non-polar arsenic with hot water and a mixture of dichloromethane and methanol, respectively. While the water-soluble arsenicals were speciated by anion and cation exchange liquid chromatography inductively coupled plasma mass spectrometry (LC-ICP-MS), the non-polar arsenicals were collectively determined by ICP-MS after digestion in acid...
February 23, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29455284/speciation-analysis-of-arsenic-in-seafood-and-seaweed-part-i-evaluation-and-optimization-of-methods
#2
Mesay Mulugeta Wolle, Sean D Conklin
Several extraction and chromatographic methods were evaluated to identify optimum conditions for arsenic speciation analysis in seafood and seaweed. The extraction systems, which include aqueous, aqueous-organic, acidic, basic, and enzymatic solutions, were examined for their efficiency in extracting arsenic from finfish, crustaceans, molluscs, and seaweed keeping the chemical forms of the native arsenicals intact. While dilute solutions of nitric acid, hydrochloric acid, and tetramethylammonium hydroxide (TMAH) extract high fractions of arsenic from most of the matrices, the extractants oxidized arsenite (As3+ ) to arsenate (As5+ ) and converted some arsenosugars and non-polar arsenicals to known and/or unknown forms...
February 17, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28974440/hijiki-and-sodium-arsenite-stimulate-growth-of-human-colorectal-adenocarcinoma-cells-through-erk1-2-activation
#3
Wanida Cholpraipimolrat, Tawit Suriyo, Nuchanart Rangkadilok, Sumontha Nookabkaew, Jutamaad Satayavivad
Hijiki seaweed (Hijikia fusiformes) contains high levels of inorganic arsenic, a known carcinogen. However, scientific reports on carcinogenic risks associated with the consumption of this seaweed are limited. This study investigated the effects of seaweed extracts contaminated with arsenic on two colorectal cancer cell lines. Two seaweed extracts, including Hijiki and red seaweed, induced H508 but not HT29 cell proliferation. Growth induction of H508 cells after treatments with Hijiki and sodium arsenite at concentrations equivalent to arsenic found in Hijiki was observed by both MTT and BrdU assays...
September 30, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/27451169/accuracy-of-a-method-based-on-atomic-absorption-spectrometry-to-determine-inorganic-arsenic-in-food-outcome-of-the-collaborative-trial-imep-41
#4
I Fiamegkos, F Cordeiro, P Robouch, D Vélez, V Devesa, G Raber, J J Sloth, R R Rasmussen, T Llorente-Mirandes, J F Lopez-Sanchez, R Rubio, F Cubadda, M D'Amato, J Feldmann, A Raab, H Emteborg, M B de la Calle
A collaborative trial was conducted to determine the performance characteristics of an analytical method for the quantification of inorganic arsenic (iAs) in food. The method is based on (i) solubilisation of the protein matrix with concentrated hydrochloric acid to denature proteins and allow the release of all arsenic species into solution, and (ii) subsequent extraction of the inorganic arsenic present in the acid medium using chloroform followed by back-extraction to acidic medium. The final detection and quantification is done by flow injection hydride generation atomic absorption spectrometry (FI-HG-AAS)...
December 15, 2016: Food Chemistry
https://www.readbyqxmd.com/read/27152978/fucoidan-extracted-from-hijiki-protects-brain-microvessel-endothelial-cells-against-diesel-exhaust-particle-exposure-induced-disruption
#5
Young-Sook Choi, Sang-Yong Eom, In-Soo Kim, Syed F Ali, Michael T Kleinman, Yong-Dae Kim, Heon Kim
This study was performed to evaluate the protective effects of fucoidan against the decreased function of primary cultured bovine brain microvessel endothelial cells (BBMECs) after exposure to diesel exhaust particles (DEPs). BBMECs were extracted from bovine brains and cultured until confluent. To evaluate the function of BBMECs, we performed a permeability test using cell-by-cell equipment and by Western blot analysis for zonular occludens-1 (ZO-1), which is a tight junction protein of BMECs, and evaluated oxidative stress in BBMECs using the DCFH-DA assay and the CUPRAC-BCS assay...
May 2016: Journal of Medicinal Food
https://www.readbyqxmd.com/read/25478593/shelf-life-and-quality-study-of-minced-tilapia-with-nori-and-hijiki-seaweeds-as-natural-additives
#6
Ingridy Simone Ribeiro, Ligianne Din Shirahigue, Lia Ferraz de Arruda Sucasas, Lika Anbe, Pedro Gomes da Cruz, Cláudio Rosa Gallo, Solange Teresinha Carpes, Marcos José Marques, Marília Oetterer
The extraction of mechanically separated meat has emerged as an attractive process. However, it increases the incorporation of oxygen and, consequently, of flavors due to rancidity. Thus, preservatives must be added. The objective of this study was to evaluate the shelf life of minced tilapia to replace synthetic preservatives with Hijiki and Nori seaweeds extracts. The application of the extracts had no effect on the chemical composition of the minced tilapia. The seaweed extracts had inhibitory effect on total volatile base nitrogen...
2014: TheScientificWorldJournal
https://www.readbyqxmd.com/read/25393691/arsenic-bioaccessibility-from-seaweed-and-rice-dietary-exposure-calculations-and-risk-assessment
#7
COMPARATIVE STUDY
Esther F A Brandon, Paul J C M Janssen, Lianne de Wit-Bos
Arsenic is a metalloid that occurs in food and the environment in different chemical forms. Inorganic arsenic is classified as a class I carcinogen. The inorganic arsenic intake from food and drinking water varies depending on the geographic arsenic background. Non-dietary exposure to arsenic is likely to be of minor importance for the general population within the European Union. In Europe, arsenic in drinking water is on average low, but food products (e.g. rice and seaweed) are imported from all over the world including from regions with naturally high arsenic levels...
2014: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/25253519/daily-inorganic-arsenic-intake-of-the-japanese-estimated-by-a-probabilistic-approach
#8
Tomoko Oguri, Jun Yoshinaga
OBJECTIVE: The objective was to estimate the inorganic arsenic (iAs) intake of the general Japanese adult population by a probabilistic approach. METHODS: Bioaccessible iAs concentrations in rice (n=56) and hijiki (n=32), the two food items that are the major iAs sources for the Japanese, were measured by liquid chromatography-ICP mass spectrometry. The concentration in cooked rice was estimated from the measured concentration in a raw rice sample while taking into consideration the loss of iAs during cooking...
2014: Nihon Eiseigaku Zasshi. Japanese Journal of Hygiene
https://www.readbyqxmd.com/read/25241916/quantification-of-arsenolipids-in-the-certified-reference-material-nmij-7405-a-hijiki-using-hplc-mass-spectrometry-after-chemical-derivatization
#9
Ronald A Glabonjat, Georg Raber, Kenneth B Jensen, Josef Ehgartner, Kevin A Francesconi
Arsenic-containing lipids (arsenolipids) are novel natural products recently shown to be widespread in marine animals and algae. Research interest in these arsenic compounds lies in their possible role in the membrane chemistry of organisms and, because they occur in many popular seafoods, their human metabolism and toxicology. Progress has been restricted, however, by the lack of standard arsenolipids and of a quantitative method for their analysis. We report that the certified reference material CRM 7405-a (Hijiki) is a rich source of arsenolipids, and we describe a method based on HPLC-ICPMS/ESMS to quantitatively measure seven of the major arsenolipids present...
October 21, 2014: Analytical Chemistry
https://www.readbyqxmd.com/read/25059134/stability-of-toxic-arsenic-species-and-arsenosugars-found-in-the-dry-alga-hijiki-and-its-water-extracts
#10
Sara García-Salgado, M Ángeles Quijano
The achievement of reliable results in speciation analysis requires not only sensitive techniques but also sureness of species stability. Therefore, it is necessary to carry out stability studies because it is important to know with absolute certainty that there is not any species transformation during sample treatment and/or storage. Although several procedures have been recommended for the preservation of species integrity, there is no general agreement, as arsenic species stability depends on the sample matrix, the concentration level and the sample treatment procedure, so it is necessary to assess the arsenic species stability for each case...
October 2014: Talanta
https://www.readbyqxmd.com/read/24394334/physiological-differences-of-soluble-and-insoluble-dietary-fibre-fractions-of-brown-algae-and-mushrooms-in-pepsin-activity-in-vitro-and-protein-digestibility
#11
Y Horie, K Sugase, K Horie
Soluble and insoluble dietary fibre fractions were separated from Konbu, Wakame and Hijiki seaweeds and Shiitake, Hiratake and Yanagimatsutake mushrooms, respectively, and the effects of the fractions on pepsin activity in vitro and of those from Wakame on apparent protein digestibility in vivo were studied. Addition of each dietary fibre fraction inhibited pepsin activity in vitro in all the dietary fibre fractions tested, particularly the inhibition by soluble dietary fibre fractions being significantly greater, by 62-99%, than that by insoluble dietary fibre fractions, by 22-36% (P< 0...
June 1995: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/24148462/a-green-sorbent-of-esterified-egg-shell-membrane-for-highly-selective-uptake-of-arsenate-and-speciation-of-inorganic-arsenic
#12
Ming-Li Chen, Cui-Bo Gu, Ting Yang, Yan Sun, Jian-Hua Wang
Egg-shell membrane (ESM) is a promising adsorbent for heavy metal uptake. However, carboxylic groups on ESM surface barrier arsenic adsorption. Herein, ESM is modified by esterification and the methyl esterified egg-shell membrane (MESM) possesses positive charge within pH 1-9. As a novel green sorbent material, MESM exhibits 200-fold improvement on sorption capacity of arsenate with respect to bare ESM. It presents an ultra-high selectivity of 256:1 toward arsenate against arsenite. At pH 6, 100% sorption efficiency is achieved for 2 μg L(-1) As(V) by 10 mg MESM, while virtually no adsorption of As(III) is observed...
November 15, 2013: Talanta
https://www.readbyqxmd.com/read/24128572/analysis-of-the-monosaccharide-composition-of-water-soluble-polysaccharides-from-sargassum-fusiforme-by-high-performance-liquid-chromatography-electrospray-ionisation-mass-spectrometry
#13
COMPARATIVE STUDY
Xiaodan Wu, Wei Jiang, Jiajia Lu, Ying Yu, Bin Wu
Sargassum fusiforme (hijiki) is the well-known edible algae, whose polysaccharides have been proved to possess interesting bioactivities like antitumor, antioxidant, antimicrobial and immunomodulatory activities. A facile and sensitive method based on high-performance liquid chromatography method of pre-column derivatization with 1-phenyl-3-methyl-5-pyrazolone (PMP) coupled with electrospray ionisation mass spectrometry (HPLC/ESI-MS) has been established for the analysis of the monosaccharide composition of polysaccharides in S...
February 15, 2014: Food Chemistry
https://www.readbyqxmd.com/read/23949604/inorganic-arsenic-in-the-japanese-diet-daily-intake-and-source
#14
Tomoko Oguri, Jun Yoshinaga, Hiroaki Tao, Tetsuya Nakazato
The concentrations of arsenic (As) species in 19 food composites prepared from 159 food items purchased in Shizuoka city, Japan, were determined (1) to estimate total daily intake of inorganic As (InAs) and some organic As species and (2) to determine food contributing to total daily InAs intake. As analysis included extraction of As species with a synthetic gastric juice (0.07 mol/L HCl + 0.01 % pepsin) from food composite and high-performance liquid chromatography-high efficiency photo-oxidation-hydride generation-inductively coupled plasma mass spectrometry...
January 2014: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/22878632/aqueous-extraction-of-water-soluble-inorganic-arsenic-in-marine-algae-for-speciation-analysis
#15
Tomohiro Narukawa, Akiharu Hioki, Koichi Chiba
An aqueous extraction of inorganic As species, such as arsenite (As(III)) and arsenate (As(V)), was developed for monitoring inorganic As in the edible brown alga Hizikia fusiforme (hijiki). The ultrasonic extraction with water, even without heating, was found to be an acceptable monitoring method for an evaluation of water-soluble inorganic As, since it could extract about 80% of total As. Such an extraction efficiency was almost the same as those of enzyme assisted extraction methods. The developed extraction procedure was applied to 15 hijiki samples that had been collected at different coasts in Japan...
2012: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/22692475/antioxidant-activity-of-selected-commercial-seaweeds
#16
Amin Ismail, Siewhong Tan
This study aims to evaluate the antioxidant activity (total antioxidant and free radical scavenging activities) of seaweeds commercially available in the Malaysian supermarket. Four types of seaweeds namely Nori (Porphyra sp.), Kumbu (Laminaria sp.), Wakame (Undaria sp.) and Hijiki (Hijikia sp.) were used in the study. The extracts were prepared with water and ethanol, respectively. The b-carotene bleaching and 1,1-diphenyl-2-picrylhydrazyl (DPPH) assays were used to determine antioxidant properties of seaweeds by measuring the decrease in absorbance at 470 and 517 nm...
September 2002: Malaysian Journal of Nutrition
https://www.readbyqxmd.com/read/22611357/fucoxantin-a-treasure-from-the-sea
#17
Nicolantonio D'Orazio, Eugenio Gemello, Maria Alessandra Gammone, Massimo de Girolamo, Cristiana Ficoneri, Graziano Riccioni
The World Health Organization (WHO) estimates that 2.3 billion people will be overweight and 700 million obese in 2015. The reasons for this disastrous trend are attributed to the global tendency toward the reduced magnitude of exercise and physical activity and the increased dietary intake of fats, sugars and calories with reduced amount of vitamins and minerals. To prevent life-style-related diseases, like Metabolic Syndrome (MS), researchers' attention is increasingly focusing on some of the so called "functional foods" which may be useful for their prevention and treatment...
March 2012: Marine Drugs
https://www.readbyqxmd.com/read/22561181/toxicity-of-so-called-edible-hijiki-seaweed-sargassum-fusiforme-containing-inorganic-arsenic
#18
Katsuhiko Yokoi, Aki Konomi
The UK Food Standards Agency and its counterparts in other countries have warned consumers not to eat hijiki (Sargassum fusiforme; synonym Hizikia fusiformis), a Sargasso seaweed, because it contains large amounts of inorganic arsenic. We investigated dietary exposure of hijiki in weaning male F344/N rats fed an AIN-93G diet supplemented with 3% (w/w) hijiki powder for 7 weeks, compared with those fed only an AIN-93G diet. Body weight, body temperature, blood and tissue arsenic concentrations, plasma biochemistry and hematological parameters were measured...
July 2012: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/22159512/preparation-and-certification-of-hijiki-reference-material-nmij-crm-7405-a-from-the-edible-marine-algae-hijiki-hizikia-fusiforme
#19
Tomohiro Narukawa, Kazumi Inagaki, Yanbei Zhu, Takayoshi Kuroiwa, Izumi Narushima, Koichi Chiba, Akiharu Hioki
A certified reference material, NMIJ CRM 7405-a, for the determination of trace elements and As(V) in algae was developed from the edible marine hijiki (Hizikia fusiforme) and certified by the National Metrology Institute of Japan (NMIJ), the National Institute of Advanced Industrial Science and Technology (AIST). Hijiki was collected from the Pacific coast in the Kanto area of Japan, and was washed, dried, powdered, and homogenized. The hijiki powder was placed in 400 bottles (ca. 20 g each). The concentrations of 18 trace elements and As(V) were determined by two to four independent analytical techniques, including (ID)ICP-(HR)MS, ICP-OES, GFAAS, and HPLC-ICP-MS using calibration solutions prepared from the elemental standard solution of Japan calibration service system (JCSS) and the NMIJ CRM As(V) solution, and whose concentrations are certified and SI traceable...
February 2012: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/19808076/ingestion-and-excretion-of-arsenic-compounds-present-in-edible-brown-algae-hijikia-fusiforme-by-mice
#20
Satoshi Ichikawa, Shihoko Nozawa, Ken'ichi Hanaoka, Toshikazu Kaise
The element arsenic is a carcinogen and toxic for humans and other living organisms. Some seaweeds contain high amounts of inorganic arsenic (iAs). In particular, Hijikia fusiforme has a high iAs content of approximately 50%. In this study, we examined the absorption, metabolism, excretion, and accumulation of arsenic compounds in mice after the administration of Hijiki. The single-dose experiment, wherein a single dose of cooked Hijiki was administered to the mice, revealed that the urinary and fecal excretion of arsenic compounds was the highest on the first day of dosing, and it became clear that 66-92% of arsenic was excreted within 3 days after administration of the first dose...
February 2010: Food and Chemical Toxicology
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