Nalinanon, Sitthipong

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Nalinanon, Sitthipong
Alternative Name
Nalinanon, S.
Nalinanon, Sittipong
Main Affiliation
Email
sitthipong.na@kmitl.ac.th

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    Item type:Publication,
    Changes in lipids and fishy odour development in skin from Nile tilapia (Oreochromis niloticus) stored in ice
    (2013-01-01)
    Sae-Leaw, Thanasak
    ;
    Benjakul, Soottawat
    ;
    Gokoglu, Nalan
    ;
    Nalinanon, Sitthipong
    Changes in lipids, lipoxygenase activity and fishy odour development in the skin of Nile tilapia (Oreochromis niloticus) during iced storage of 18 days were monitored. Triacylglycerol content of skin decreased with coincidental increases in free fatty acid, monoacylglycerol, diacylglycerol and phospholipid contents during storage (p < 0.05). During iced storage, peroxide value increased at day 9 and subsequently decreased up to 18 days (p < 0.05). Thiobarbituric acid reactive substances values and lipoxygenase activity increased throughout 18 days of iced storage (p < 0.05). With increasing storage time, a progressive formation of hydroperoxide was found as evidenced by the increase in amplitude of peak at 3600- 3200 cm-1 in Fourier transform infrared spectra. Those changes indicated that lipid oxidation took place during iced storage. The increase in fishy odour of skin was observed as the storage time increased. The development of fishy odour in Nile tilapia skin during iced storage was mostly governed by lipid oxidation via autoxidation or induced by lipoxygenase. Thus, the extended storage time of whole fish resulted in the pronounced changes in lipids and the increased fishy odour in the skin. © 2013 Elsevier Ltd.
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    Characterization of acid soluble collagen from the skin of snakeskin gourami (Trichogaster Pectoralis)
    (2020-01-01)
    Sukkon, Piyaporn
    ;
    Ali, Ali Muhammed Moula
    ;
    Nalinanon, Sitthipong
    ;
    Kishimura, Hideki
    ;
    Takeungwongtrakul, Sirima
    The present study was aimed to isolate and characterized acid soluble collagen (ASC) from the skin of snakeskin gourami (Trichogaster pectoralis). ASC from gourami skin had a yield of 9.43% and 34.65%, based on wet and dry weight basis, respectively. The purity of ASC was superior with a distinct absorption peak at wavelength (WL) of 230.7 nm. Based on the electrophoretic pattern, gourami skin ASC was classified as type I collagen, as it comprised α1 and α2 as major components and higher molecular weight (MW) components γ, β were distinctly observed. ASC exhibited high Tmax value of 33.43°C, which could correspond to its imino acids content of 188 residues/1000 residues. Fourier transform infrared (FTIR) spectrum and circular dichroism (CD) revealed that ASC extracted from gourami skin had greater structural integrity in its triple-helical form. Solubility of ASC was high at the pH range of 2-4 in which zeta potential exhibited highly positive charge. The highest solubility of ASC in the presence of NaCl was observed at 2% (w/v). Therefore, with all the characteristic features, ASC from snakeskin gourami skin can be a valueadded product in the fish processing industry.