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  • Hydrolyzed collagen  (1)
  • Microplastic  (1)
  • Nano hydroxyapatite  (1)
  • 1
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    Investigation of protein patterns and antioxidant activity of collagen hydrolysates from skin of Fan-bellied leatherjacket Monacanthus chinensis by various enzymes (2019)
    Details
    Publication Date: 2021-05-19
    Description: Collagen extracted from the skin of fan-bellied leatherjacket was hydrolyzed and tested for antioxidant activity. The yields of acid soluble collagen (ASC) and pepsin soluble collagen (PSC) were 14.8% and 19.6%, respectively, based on the wet weight of skin. The SDS-PAGE results showed that collagen from the skin of this fish consists of α1 and α2 chains with molecular weight (MW) approximately 100 kDa, identified as type I collagen. Hydrolysis of collagen by the other enzymes, such as papain, bromelain, pepsin and alcalase could produce the peptides with MW less than 28 kDa. Hydrolyzed collagen possessed the antioxidant activity with different levels and greater than that of normal collagen.
    Description: Published
    Keywords: Fan-bellied leatherjacket ; Antioxidant activity ; Hydrolyzed collagen ; Enzymes
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp. 141 - 150
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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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    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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