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Author: search.filters.author.Karnjanapratum, S.

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    Impact of hexane defatting on characteristics of Patanga succincta L. powder and its application on nutritional improvement of biscuit stick
    (2021-01-01)
    Indriani, S.
    ;
    Nalinanon, S.
    ;
    Karnjanapratum, S.
    Impact of hexane defatting on physicochemical, oxidative stability and total volatile compounds of Bombay locust (Patanga succincta L.) powder ‘BL' were studied. Defatted insect powder (F/BL) showed marked decrease in fat content (1.2%) with significantly (P<0.05) higher protein content (78.7%), compared with those of BL (29.8% fat and 56.5% protein). Based on electrophoresis result, hexane defatting had no effect on peptide distribution of insect powders. F/BL had lower peroxide value with better oxidative stability (P<0.05), while less variety of volatiles with more off-flavour compounds, particularly lipid oxidation and insect hormone odours, were observed from BL. F/BL was confirmed as an excellent source of amino acids and minerals. The physicochemical and sensory properties of F/BL fortified biscuit stick and the final products were determined. F/BL fortified biscuit stick showed a better acceptance, compared with those from BL at the same level used. Based on sensory characteristics, biscuit stick with 10% F/BL (F/BL-10) was selected and studied for its chemical composition and microstructure. F/BL-10 possessed more porous structure with higher protein and lower energy value, compared with those from 10% BL. Overall, defatted Bombay locusts could be an effective alternative protein source with excellent applicability to baked products, particularly biscuit stick.
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    Change in fatty acid profile, volatile compounds and FTIR spectra of samrong seed oil during storage
    (2020-01-01)
    Takeungwongtrakul, S.
    ;
    Karnjanapratum, S.
    ;
    Kaewthong, P.
    ;
    Nalinanon, S.
    Samrong (Sterculia foetida Linn.) is a wild plant. It is used in traditional medicine. The kernels of samrong seeds have been reported to contain a high amount of oil. The changes in fatty acid profile, volatile compounds, and fourier transform infrared (FTIR) spectra of oil from samrong seed kernel during storage (48 days) were investigated. With increasing storage time, the content of saturated fatty acid (SFA) and polyunsaturated fatty acid (PUFA) decreased. There was little change in fatty acid profile at the end of storage. As to FTIR spectra, a slight change in wave number from 3600 cm<sup>-1</sup> to 3200 cm<sup>-1</sup> and wave number 1711 cm<sup>-1</sup> was observed with increasing storage time. After storage, the results observed 12 volatile lipid oxidation compounds. However, slight changes in abundance of volatile compounds were found. Therefore, samrong seed kernel oil had good oxidative stability.
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    Effect of antioxidants and packing conditions on storage stability of cereal bar fortified with hydrolyzed collagen from seabass skin
    (2019-01-01)
    Benjakul, S.
    ;
    Pisuchpen, S.
    ;
    O’Brien, N.
    ;
    Karnjanapratum, S.
    Effect of antioxidants (green tea powder (GT) and citric acid (CA)) and packing conditions on storage stability of cereal bar fortified with hydrolyzed collagen (HC) from seabass skin was studied up to 6 months of storage at 25°C in dark. Up to 3 months of storage, the addition of antioxidants impeded lipid oxidation, especially those cereal bars packed in polypropylene with normal heat seal (PP). Changes in moisture content, water activity, color, texture, PV, TBARS and formation of volatiles were effectively retarded when samples were packed under N2 gas in laminated polyethylene/aluminium foil bag (LF) for 6 months of storage.