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Author: search.filters.author.Kaewthong, P.

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    Oxidative stability of Iresine herbstii extract-containing coconut oil during storage
    (2023-01-01)
    Sai-Ut, S.
    ;
    Senphan, T.
    ;
    Pongsetkul, J.
    ;
    Kaewthong, P.
    ;
    Tuntivisoottikul, K.
    Virgin coconut oil was used as green solvent for the extraction of total phenolics from I. herbstii (I. herbstii: coconut oil, 1:10 (w/w)). I. herbstii extract-containing coconut oil (ECC) had dark red in color. Acid value (AV), peroxide value (PV), thiobarbituric acid-reactive substances (TBARS), ρ-anisidine value and volatile compounds were taken as parameters for evaluation of oxidative stability of EEC sample. All parameters of EEC sample were lowered, in comparison with the control sample during storage for 7 weeks. ECC sample produced less TBARS value than the control (p<0.05). Abundance of volatile compounds in all samples correlated well with the TBARS value. Results revealed the use of coconut oil as green solvent for extraction of bioactive compounds and natural red pigment from I. herbstii, where I. herbstii as antioxidant to prevent lipid oxidation in vegetable oil.
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    Extraction and antioxidant activities of broken Ganoderma lucidum spore
    (2021-11-01)
    Senphan, T.
    ;
    Takeungwongtrakul, S.
    ;
    Kaewthong, P.
    Soxhlet and microwave-assisted extraction (MAE) methods showed the highest extraction yield and total phenolic content of extract from broken spores of Ganoiderma lucidum (p<0.05). However, the extraction time of MAE method was shorter than the soxhlet extraction method. The broken spores of G. Lucidum were extracted using different solvent types with MAE method. Ethanol extraction rendered extract with the highest total phenolic content and ferric reducing antioxidant power (FRAP) value (p<0.05). For metal chelating activity, ethanol and hexane extracts were significantly high compared to other extracts of broken G. lucidum spores (p<0.05). Thus, the use of appropriated extraction method and solvent type rendered to extract with high total phenolic content and antioxidant activities.
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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.