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  • Tetrodotoxin  (2)
  • Compound purification  (1)
  • Microplastic  (1)
  • 1
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    Tetrodotoxin and saxitoxin in some Nassarius species (Nassarius Duméril, 1806) collected in Khanh Hoa waters (2017)
    Details
    Publication Date: 2021-05-19
    Description: Toxins of 5 species belonging to Nassarius collected in Khanh Hoa waters, including Nassarius siquijorensis, N. glans glans, N. livescens, N. pullus, and N. conoidalis conoidalis were detected. Among them, three species contained a high amount of toxin: 431.49 ± 206.50 MU/g in N. glans glans, 154.81 ± 85.02 MU/g in N. conoidalis conoidalis and 20.44 ± 9.77 MU/g in N. pullus. High-performance liquid chromatography with fluorometric detector (FPLC-FLD) revealed that the major toxin component was tetrodotoxin (TTX) 4epi-TTX, 4,9-anhydroTTX, whereas saxitoxin was not found in any specimen by this method.
    Description: Published
    Keywords: Gastropoda ; Nassarius ; Tetrodotoxin ; Saxitoxin ; Toxin ; TTX
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp. 70-79
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  • 2
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    Microplastics in three sandy beaches in Khanh Hoa province (2022)
    Details
    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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    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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  • 4
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    Frequent occurrence of tetrodotoxin in the marine gastropod Nassarius glans causing a food poisoning in Khanh Hoa province, Vietnam in 2020 (2024)
    Details
    Publication Date: 2024-03-27
    Description: A fatal neurotoxic poisoning case happened in Khanh Hoa province in 2020 after eating a certain number of marine gastropods, later identified as Nassarius glans, one of the common marine gastropods in Vietnam. As the remaining causative food in the incident, 62 specimens were collected to examine tetrodotoxin toxicity individual variation and frequency of toxic specimens by using HILIC/MS-MS analysis. 100% of studied specimens exhibited toxicity (556 ± 821 MU/g) beyond the regulatory level of consumption (10 MU/g) for puffer(fish) recommended in Japan and extensive variation (18–4,046 MU/g). The result pointed out that only 5 g of soft tissue from N. glans (equivalent to 2–3 specimens) containing maximum toxicity detected in the present study may cause human death if consumed. Fhe first time, this study identified TTXs in the gastropods as a causative toxin in the poisoning in Vietnam. Moreover, 65.5% of studied specimens with high toxicity higher than 100 MU/g, including 16.1%, showing extremely high toxicity (〉 1,000 MU/g). The results suggested that this gastropod is quite dangerous for human consumption and should be alerted to public awareness.
    Description: Published
    Description: Refereed
    Keywords: Gastropod ; Nassarius glans ; Poisoning ; Tetrodotoxin
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 203-208
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