• Title, Summary, Keyword: safety of seaweeds

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Study on UV Absorption Materials Derived from Red Algae Gloiopeltis fucatas and Mazzaella sp. in Russia

  • Lee, Moon-Hee;Kim, Yeon-Kye;Yoon, Na Young;Shim, Kil Bo;Aminina, Natalya M.;Kadnikova, Irina A.;Lim, Chi-Won
    • Fisheries and aquatic sciences
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    • v.15 no.4
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    • pp.361-363
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    • 2012
  • We investigated ultraviolet (UV) absorption materials from Russian seaweeds. First, the UV absorptivities of five seaweeds Gloiopeltis fucatas, Mazzaella sp., Mastocarpus pacificus, Laminaria cichorioides, Saccharina japonica were evaluated by a UV spectrometer. Of these seaweeds, Gloiopeltis fucatas and Mazzaella sp. showed high levels of UV absorption. Column chromatography of active 50% aqueous ethanol extracts from Gloiopeltis fucatas and Mazzaella sp. resulted in the purification of two known compounds. Spectroscopic techniques identified their structures as shinorine and palythine. These materials exhibited UV absorptive capabilities at wavelengths of 333 and 320 nm, respectively. These results suggest that Gloiopeltis fucatas and Mazzaella sp. may be useful as natural cosmeceutical sources.

Sulfates Contents Survey on Dried Seaweeds in Market (시판 건 해초류(미역, 김, 다시마 등) 중 아황산염류 함량 조사)

  • 함희진;김무상;김명희
    • Journal of Food Hygiene and Safety
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    • v.15 no.4
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    • pp.340-343
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    • 2000
  • This study was performed to investigate the contents of sulfites in 1,063 dried seaweeds in Seoul Chung-Bu market from March in 1999 to August in 2000. Sulfites of the samples were determined by Zn powder reduction method and bonnier-Williams's modified method. Two samples of 1063 (0.19%) were detected over 30ppm in SO$_2$ contents by bonnier-Williams's modified method. In samples detected over 30ppm, 2 brown algaes were 171.4ppm and 295.7ppm. By Zn powder reduction method, 54 dried seaweeds (54/1063 = 5.08%) were positive reaction (1-30ppm). These were 28 dried lavers, 27 dried brown seaweeds and 2 sea cabbages. According to results, the quality test far the dried seaweeds must be reinforced to supply safety food for the citizens.

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Comparison of Metal Contents in Seaweeds Collected from the Busan Coastal Area

  • Jeong, Kap-Seop
    • Journal of Environmental Science International
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    • v.17 no.9
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    • pp.943-947
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    • 2008
  • For the purpose of safety identification, the concentrations of heavy metals in seaweeds collected from Busan Gijang coastal area were investigated. The average concentration of metals had a level of as high as the order of manganese (2.76 ppm)>zinc(2.11 ppm)>copper(0.59 ppm)>arsenic (0.092 ppm)>lead(0.06 ppm)> mercury(0.03 ppm)>cadmium(0.026 ppm). The contents of manganese and zinc were highly detected from P. elliptica, copper and mercury from agar, cadmium from sea mustard and arsenic from wild sea mustard, respectively. The metal contents of seaweeds varied with kinds of samples, but high level for the safety can be found in these samples. Because P. elliptica had shown a clear selectivity for both manganese and zinc, this seaweed could be useful as a bioindicator for these two metal pollution.

Heavy Metal Contents and Food Safety Assessment of Processed Seaweeds and Cultured Lavers (국내 가공 해조류와 미가공 김의 중금속 함량 및 식품 안전성평가)

  • Yang, Won Ho;Lee, Hyo Jin;Lee, Sang Yong;Kim, Seong Gil;Kim, Gi Beum
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.19 no.3
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    • pp.203-210
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    • 2016
  • In this study, nine heavy metals were analyzed in seaweeds collected from market and laver culture farm of Korea and a food safety assessment were also carried out for these heavy metals. The level of heavy metal concentrations in seaweeds was in the following order: Fe>As>Zn>Cu>Cd>Pb>Cr>Ni>Hg. Except for zinc and cadmium, seven heavy metals were significantly higher in cultured laver than in processed laver. Significant correlation was observed Cr-Fe in cultured laver and Cu-Zn, Cd-Cu, Cd-Zn and Pb-Ni in processed laver and Cu-Cr, Cu-Zn, Cd-Cr and Ni-Fe in sea tangle and Zn-Fe, Cr-Fe, Cr-Zn, Cd-Ni, Cu-Cd and Cu-Pb in processed sea mustard. Considering differences in heavy metal concentration between processed laver and cultured laver and in correlation among heavy metals, removal efficiency of heavy metals may be attributed to seaweed treatment process. The average weekly intakes of Cu, Cd, Zn, Fe and Hg via seaweeds consumption were about 0.1~7.6% of PTWI (Provisional Tolerable Weekly Intakes). Therefore, it was found that heavy metals in the seaweeds were very safe for consumption.

Trace Metal Contents in Seaweeds from Korean Coastal Area (한국 연안 해조류의 미량금속 함량)

  • Kim, Ji-Hoe;Mok, Jong-Soo;Park, Hee-Yeon
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.34 no.7
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    • pp.1041-1051
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    • 2005
  • In order to assure the safety of the seaweeds, we measured the contents of the trace metals in the seaweeds harvested from Korean coastal area. We collected 620 marine algal samples from fourteen areas, and then analyzed the trace metals such as Hg, Cd, Cr, Cu, Mn, Ni, Pb and Zn. The contents of Hg, Cd, Ni and Mn were higher in the seaweeds collected from Chungnam Taean area. The contents of Cr and Cu were higher in the seaweeds collected from Yeongdeok and Tongyeong area, respectively. And Pb and Zn were highly detected from the seaweeds of Ulsan area. The mean levels of trace metals were high in the order of Zn $(48.02\pm41.20{\mu}g/g)\;>\;Mn (34.63\pm38.95{\mu}g/g)\;>\;Cu(6.29\pm6.52{\mu}g/g)\;>\;Ni(2.17\pm4.00{\mu}g/g)\; >\;Cr(1.61\pm2.35{\mu}g/g)\;>\;Pb(1.28\pm2.37{\mu}g/g)\;>\; Cd(0.67\pm0.75{\mu}g/g)\;>\;Hg(0.02\pm0.02{\mu}g/g)$. Zn was consistently most abundant metal in all samples, followed by Mn and Cu, which are very important for human health. There were higher contents of Hg and Cd in brown algae, the contents of Cr, Cu, Mn, Ni and Pb in green algae, the content of Zn in red algae among them. Additionally, significant linear correlations were observed between a total 28 different pairs of metals, of them, the correlation factor between Cr and Ni showed the highest (r=0.374, p<0.001). The trace metal contents of seaweeds varied with habitats and kinds of samples, nevertheless they showed very safe level in edible seaweeds tested. Scytosiphon lomentaria, which has been known as a little use of food, have shown a clear selectivity for Cr and Pb. Among non-edible seaweeds, Sargassum thunbergii for both Cd and Mn, Lomentaria hakodatensis for Ni and Grateloupia prolongata for Zn have shown a clear selectivity, respectively. Therefore, these seaweeds could be useful as bioindicator for each trace metal pollution.

Trace Metal Contents and Safety Evaluation of Major Edible Seaweeds from Korean Coast (한국산 주요 식용해조류의 미량금속 함량 및 안전성 평가)

  • Mok, Jong-Soo;Park, Hee-Yeon;Kim, Ji-Hoe
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.34 no.9
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    • pp.1464-1470
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    • 2005
  • To assure the safety of the major edible seaweeds, we collected the 176 samples of seaweeds such as laver(Porphyra sp.), sea mustard (Undaria pinnatifida), sea tangle (Laminaria japonica) and sea lettuce (Enter-omorph sp.) from Korean coast. We investigated the contents of the trace metals in the edible seaweeds, and the values were expressed as the dry weight of sea weeds. The mean levels of the trace metals were high in the oder of Zn ($36.19{\pm}27.14 \;{\mu}g/g$), Mn ($28.75{\pm}28.03\;{\mu}g/g$), and Cu ($6.82{\pm}7.62\;{\mu}g/g$), which are necessary metals in the human body, and then followed by Cr ($1.54{\pm}2.07\;{\mu}g/g$), Ni ($1.29{\pm}2.57\;{\mu}g/g$), Pb ($0.89{\pm}1.11\;{\mu}g/g$), Cd ($0.72{\pm}0.80\;{\mu}g/g$) and Hg ($0.01{\pm}0.02\;{\mu}g/g$). The contents of Cd and Zn were high in the laver, Cr, Ni and Pb were detected highly in sea lettuce, and Hg was detected highly in sea tangle. Significant linear correlations were obtained among 28 different pairs of metals, some of them highly correlated (r>0.5, p<0.05),such as Ni-Mn, Zn-Ni, Cu-Pb and Cu-Zn in laver, Ni-Zn in sea mustard, Cu-Pb, Cu-Zn and Mn-Pb in sea tangle, and Ni-Cr in sea lettuce. And, the trace metal contents of seaweeds varied with parts and kinds of samples. The average weekly intakes of Hg, Cd and Pb from seaweeds were about $0.07{\~}3.57\%$ of PTWI (Provisional Tolerable Weekly Intakes) which has set by FAO/WHO to evaluate the safeties of trace metals in food. Therefore, it was found that they showed very safe levels in the edible seaweeds.

An Experimental Study on the Low Permeability Concrete with the Marine Wastes (해양폐기물을 이용한 수밀콘크리트 개발에 관한 연구)

  • 백신원;김인배
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • pp.74-79
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    • 2003
  • Many marine wastes such as seaweeds are casted aside at the seasides. So, the objective of this study is to apply the marine wastes to the concrete. To this end, mortar and concrete tests with the marine wastes have been conducted. The results of the present mortar and concrete tests indicate that the mortar and concrete with marine wastes admixtures exhibits very low permeability. The present study provides a firm base for the use of very low permeable concrete and the application of the marine structures and the submerged structures.

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A Study of Heavy Metals Contents of the Seaweeds at Various Area in Korea (지역별 해조류의 중금속 함량)

  • Choi, Soon-Nam;Lee, Sang-Up;Chung, Keun-Hee;Ko, Weon-Bae
    • Korean journal of food and cookery science
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    • v.14 no.1
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    • pp.25-32
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    • 1998
  • To measure the contents of several heavy metal elements (Cr, Mn, Ni, Cu, Zn, Cd, Hg, Pb) in Korean seaweeds which are closely related to food resources, various seaweed samples were collected from thirteen to seventeen seaweed-producing districts. The results obtained from the experiment are summarized as follows: 1. The content of heavy metal elements in seaweeds of individual sample ranged from 0.0005 to 25.0373 ppm. Their mean levels were as follows: laver, 0.0024∼3.9297 ppm; sea lettuce, 0.0011∼25.0373 ppm; sea mustard, 0.0005∼23.5071 ppm; sea tangle, 0.0006∼4.8550 ppm. The mean levels of Cd and Pb were specially low in the samples collected from the area II in Kangwon and area Ⅸ in Kyungbook. 2. The mean levels of heavy metal elements of collected samples ranged from 0.0117 to 4.4944 ppm. Laver showed the lowest level of Hg and sea lettuce showed the highest level of Mn. Their mean levels of elements were as follows: laver, 0.0117∼2.3339 ppm; sea lettuce,0.0232∼4.4944 ppm; sea mustard, 0.0129∼1.5139 ppm and sea tangle, 0.0182∼1.7410 ppm. 3. The mean levels of heavy metal elements from several locations ranged from 0.0085 ppm to 8.4148 ppm. The mean levels of heavy metal elements in sea mustard from area V of Kyungbook were the lowest, but the mean levels of heavy metal elements in sea lettuce from area Ⅷ of Kyungnam were the highest. The mean level of heavy metal elements were as follows: laver, 0.3613∼1.1124 ppm; sea lettuce, 0.1415∼8.4148 ppm; sea mustard, 0.0729-3.1182 ppm; sea tangle, 0.0085∼0.7587 ppm. 4. Generally the heavy metal elements were detected in the seaweed samples from all locations. The mean levels of heavy metal elements varied with locations and kinds of samples. The levels of heavy metals of the samples taken from all locations from the East Sea, the South Sea, and the West Sea areas showed 99% safety range.

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Comparison of Aquacultured and Wild Undaria pinnatifida Thalli for Evaluation of Eight Quality Standards (미역의 8가지 품질기준 설정을 위한 양식산 및 자연산 미역의 비교)

  • Kang, Ji-Young;Park, Nam-Hee;Hai, Luyen Quoc;Seo, Man-Seok;Hong, Yong-Ki
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.41 no.5
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    • pp.337-342
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    • 2008
  • Eight quality standards of the brown seaweed, Undaria pinnatifida were designed and evaluated with dry products collected from aquacultured and wild areas. Contents of n-3 fatty acids (stearidonic acid and eicosapentaenoic acid), anti-edema activity, and total carbohydrate were measured as functional criteria. Total bacteria and molds were counted for safety conditions. Amounts of a brown pigment fucoxanthin, debris, and moisture were measured to evaluate the visible status of the products. When the seaweeds were tested in 1 g dry weight basis, they showed n-3 fatty acids in the range of approximately 0.2-2.8 mg, total carbohydrate of 0.39-0.71 g, total bacteria of $10^{4-6}$ cells, mold of $10^2$ cells, fucoxanthin of 0.4-1.5 mg, and debris of 10-24 mg. Anti-edema activity was 0.03-0.47 AU at 40 mg/mL extract. Moisture content was 11.4-12.6%.