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  • Katsuwonus pelamis  (2)
  • Compound purification  (1)
  • Microplastic  (1)
  • 1
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    Certain properties of calcium hydroxyapatite from skipjack tuna bone, Katsuwonus pelamis (2019)
    Details
    Publication Date: 2021-05-19
    Description: This paper is concerned with certain properties of calcium hydroxyapatite from skipjack tuna bone (Katsuwonus pelamis) which are by-products of fish export industry. Hydroxyapatite Ca10(PO4)6(OH)2 and β-tricalcium phosphate Ca3(PO4)2, the high-value compounds, have been successfully extracted from skipjack tuna bones. The bones were heated at different temperatures of 600oC, 900oC, 1200oC. While at 600oC hydroxyapatites were obtained with Ca/P ratio of 1.658, comparable to the value of 1.67 found in human bone; the hydroxyapatite crystals of average size of 0.25 µm were formed with the same size distribution. In case of heated bone samples at 900°C and 1200°C, the calcium formed were biphasic calcium phosphate composed of hydroxyapatite and β-tricalcium phosphate; the Ca/P ratio was between 1.660–1.665; the calcium crystals of more than 1 µm were highly porous and connected to each other in priority orientation of tube direction.
    Description: Published
    Keywords: Skipjack tuna bone ; Katsuwonus pelamis ; Calcium hydroxyapatite
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp. 151-163
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  • 2
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    Microplastics in three sandy beaches in Khanh Hoa province (2022)
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    Publication Date: 2022-05-31
    Description: Microplastics (MPs) are small plastic debris (〈 5 mm) which pose negative impacts to marine ecosystems. This paper investigated microplastic abundance in 0–5 cm and 5–10 cm layers of three sandy beaches in Khanh Hoa province. The results showed that fiber was the most abundant microplastics in the samples, comprising 85% of the total microplastics. Fragment and film were reported with smaller percentages, over 10% and 2%, respectively. In addition, the effect of grain sizes on microplastic abundance in two sediment layers was also observed. At Doc Let and Cam Lam, sediments were mainly of fine grain sizes, microplastic concentrations decreased, when the sample depths increased. On the other hand, at Bach Dang, sediment sizes ranged from medium to coarse sizes, the difference of microplastic levels in two layers was not significant.
    Description: Published
    Description: Refereed
    Keywords: Microplastic ; Sandy beach
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 39-47
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  • 3
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    Preparation of nanohydroxyapatite from skipjack tuna bone (Katsuwonus pelamis) by alkaline hydrolysis and thermal calcination methods (2022)
    Details
    Publication Date: 2022-06-07
    Description: As the main component of bones and teeth, hydroxyapatite (HAp) is considered a vital biomaterial in many fields. Meanwhile, fishbone by-products are abundant sources of HAp. Therefore, this study was conducted to prepare nano HAp from skipjack tuna bone (Katsuwonus pelamis) using alkaline hydrolysis and thermal calcination methods. After pre-treatment of fish bones for removing organic impurities, the bone powders were under alkaline hydrolysis in 1 M NaOH solution at 250o C for 1 hour. This method allows to obtain HAp nanopowders with an average particle size of only 22 nm; whereas, when heating at 600o C for four hours, the calcium formed was on average larger (40 nm) in size than the alkaline hydrolysis product. The HAp nanopowders formed by alkaline hydrolysis had a molar ratio of Ca/P 1.929, higher than that of the calcinated sample (1.848). These Ca/P molar ratios prove that the nano-HAp powders are B-type biological hydroxyapatites confirmed by the FTIR spectrum. In addition, the heavy metal contents of calcium powders are detected within safety limits of regulatory requirements of Vietnam regulations on dietary supplements and functional foods.
    Description: Published
    Description: Refereed
    Keywords: Skipjack tuna bon ; Nano hydroxyapatite ; Thermal calcination ; Skipjack tuna ; Katsuwonus pelamis
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 67-80
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  • 4
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    Metabolites from the soft coral -associated bacterium Micrococcus sp. strain a-2-28 (2024)
    Details
    Publication Date: 2024-02-17
    Description: The marine actinomyces Micrococcus was the most common bacterium among the isolates corals, sponges, and alga isolates. Only a few investigations of natural compounds from Micrococcus sp. were reported previously. This study implicated the soft coral-associated Micrococcus sp. strain A-2-28 (following relative Micrococcus flavus LW4T) for large-scale cultivation, chemical analyses, and biological activities. Whereas crude extract of the strain A-2-28 inhibited only Staphylococcus epidermidis, metabolites profiles and pure compounds from strain A-2-28 showed that this strain produced phytohormone (IAA), metabolized some new compounds which were almost inactive for biological tests. This work suggested that it is possible to plan a new strategy for improving coral health and resilience though their associated microbial.
    Description: Published
    Description: Refereed
    Keywords: Soft coral ; Micrococcus sp. ; Compound purification ; Bioassays
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 181-188
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