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Sustainable techniques to enhance novel techno-functional properties and modulate starch digestibility of polyphenol-rich red rice flours with varying amylose content
(2025-07-15)
Luangsakul, Naphatrapi
;
Van Ngo, Tai
Red rice flours performed modification using sustainable techniques, including ANN (annealing), HMT (heat moisture treatment), US (ultrasound), Pregel (Pregelatinization), WM (wet-microwave treatment), and DM (dry-microwave treatment). Manpo rice flour, which is high in amylose, demonstrated higher peak viscosity compared to flours from medium-high amylose rice (Hommali rice), under the same treatment conditions. The reduction in swelling power observed after ANN and HMT treatment in both varieties corresponds with the pasting behaviors of these flours. All samples exhibited notable shear-thinning properties. Pregel samples exhibited rapid digestion, with the maximum RDS levels reaching 35.4 % for Manpo rice and 37.3 % for Hommali rice. While, the structure of US samples changed, resulting in enhanced polyphenol bioaccessibility and decreased digestion rate. The lowest eGI recorded in US samples was 60.7 for Manpo rice and 61.5 for Hommali rice, with polyphenol bioaccessibility at 180 min measured at 37 % and 28.8 %, respectively. This study documents the impact of sustainable practices on the properties of red rice flours, thereby enhancing its culinary applications for future commercialization.
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Green modification techniques for modulating the properties and starch digestibility of rich-polyphenol low-amylose Riceberry rice (Oryza sativa L.) flour
(2025-01-01)
Van Ngo, Tai
;
Luangsakul, Naphatrapi
Six green modification techniques, including annealing (ANN), heat moisture treatment (HMT), pregelatinization (Pregel), ultrasound (US), wet-microwave (WM), and dry-microwave (DM), were applied to modulate the properties of rich-polyphenol low-amylose rice flour. WM produced more stable flour paste with the highest peak viscosity (246.83 ± 7.03 RVU) and swelling power (8.98 ± 1.04 g/g), and lowered digestion rate. Pregel reduced the pasting properties, led to a weak gel structure, and increased estimated glycemic index (eGI = 69.69 ± 2.69). US sample improved the solubility and increased the polyphenols bioavailability, and significantly decreased rate of digestion (eGI = 60.77 ± 0.90). ANN and HMT, altered the digestion rate of flour to be lower as presented by FTIR spectra. The previous results were confirmed by multivariate analysis. This is the first study on green modification techniques affecting the properties of low-amylose purple rice flour, opening the possibility of producing highly functional rice flour for the development of low-digestibility rice products with specific properties.
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Natural wound dressing films prepared from acetylated starch/κ-carrageenan blend incorporated with mandelic acid
(2024-01-01)
Sriphochai, Wimolsiri
;
Prachayawarakorn, Jutarat
Due to several limitations of acetylated starch film for wound dressing applications such as low mechanical properties and no antibacterial activity, acetylated starch film was, therefore, modified by different contents of κ-carrageenan and mandelic acid. Infrared spectra confirmed the presence of κ-carrageenan and mandelic acid in the modified acetylated starch films. In addition, the decreased crystallinity of the carrageenan modified acetylated starch films led to more smooth film, as observed by scanning electron images. Besides, the addition of various amounts of κ-carrageenan in the modified acetylated starch films caused the improvement of mechanical properties, moisture uptake, water vapor transmission rate (WVTR), and degree of swelling. Moreover, κ-carrageenan modified acetylated starch film loaded with 20 wt% of mandelic acid exhibited antibacterial property against both S.aureus and E.coli bacteria. Additionally, degree of crystallinity, mechanical properties, moisture uptake, WVTR, degree of swelling, antibacterial activity, and cytotoxicity of κ-carrageenan modified acetylated starch films added by different amounts of mandelic acid were also studied.
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Chemical modification of biodegradable cassava starch films by natural mono-, di- and tri-carboxylic acids
(2019-01-01)
Prachayawarakorn, Jutarat
;
Tamseekhram, Jintapa
Starch is the most important polysaccharide polymer used to develop biodegradable films, mainly used for packaging applications. Due to high hydrophilicity and poor mechanical properties of biodegradable starch film, different types of natural carboxylic acids were introduced into cassava starch film. These were lactic acid (LA), malic acid (MA) or citric acid (CA), classified as the mono-, di- and tri-carboxylic acid, respectively. It was found from Infrared (IR) spectra that new IR peak position arisen from the ester group and new hydrogen bond formation were observed for different acid-modified starch films. In addition, the incorporation of different types of the acids into the cassava starch film also caused significant decrease of swelling, water uptake and water vapor permeability (WVP) because of more hydrophobicity of various starch films modified by the acids. Comparison among different types and contents of the acids used for modifying cassava starch films was performed. Furthermore, morphological, thermal and biodegradable properties were also investigated.
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Dyeing properties of Bombyx mori silks grafted by 2-hydroxyethyl methacrylate (HEMA)
(2010-10-01)
Prachayawarakorn, J.
;
Khanchaiyapoom, K.
Graft copolymerization technique was selected to improve properties of Bombyx mori silks. The silks were degummed and grafted by 2-hydroxyethyl methacrylate (HEMA), resulting in different graft yields of the degummed silks. It was found that thermal decomposition temperature and wear strength of the silks grafted by HEMA were clearly improved. In addition, dyeing properties of the degummed and HEMA-grafted silks were investigated by using different natural dyes, i. e. coconut shell (Cocos nucifera), pandanus (Pandanus odorus) and Siamese cassia (Cassia siamea) and also synthetic dyestuff, i. e. acid dye. When dyeability and colorfastness properties were investigated, it was observed that higher graft yield of the HEMA-grafted silks exhibited greater dye uptake for all of the applied dyes. Besides, fastness properties to washing, perspiration, light and rubbing of the degummed and HEMA-grafted silks were examined. © 2010 The Korean Fiber Society and Springer Netherlands.
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Physical, chemical, and dyeing properties of Bombyx mori silks grafted by 2-hydroxyethyl methacrylate and methyl methacrylate
(2007-11-05)
Prachayawarakorn, J.
;
Boonsawat, K.
To obtain silk weight gain and to improve silk properties, Bombyx mori silks were grafted with either 2-hydroxyethyl methacrylate (HEMA) or methyl methacrylate (MMA). The moisture regain of the HEMA-grafted and MMA-grafted silks depended on the hydrophilicity of the used monomers. The acid and alkaline resistances of the HEMA-grafted and MMA-grafted silks were clearly improved. Both commercial synthetic dyes, that is, acid and reactive dyes, and a natural dye extracted from turmeric, with potassium aluminum sulfate as a mordant, were used in this study. The results suggested that the dye uptake increased in the presence of poly(2-hydroxyethyl methacrylate) or poly(methyl methacrylate) in the silk fibroin structures when acid and curcumin dyes were used. The washfastness level of the HEMA-grafted silk dyed by acid and reactive dyes was similar to that of the degummed silk. However, the colorfastness to washing of the MMA-grafted silk dyed by an acid dye was improved when the polymer add-on concentration was 65%. In addition, the washfastness for both grafted silks was improved when they were dyed with natural curcumin dyestuff. The acid and alkaline perspiration fastness properties remained unchanged for the HEMA-grafted and MMA-grafted silks when acid, reactive, and curcumin dyes were applied. © 2007 Wiley Periodicals, Inc.
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Dyeing properties of bombyx mori silks grafted with methyl methacrylate and methacrylamide
(2006-04-15)
Prachayawarakorn, Jutarat
;
Kryratsamee, Watthana
To improve their dyeing and colorfastness properties, degummed Bombyx mori silks were chemically modified by a grafting technique with either methyl methacrylate (MMA) monomer or methacrylamide (MAA) monomer. Both commercial synthetic dyes, that is, acid and basic dyes, and natural dyes extracted from turmeric, without and with potassium aluminum sulfate mordant, were used in this study. Percentage dye uptake increased with the presence of poly(methyl methacrylate) or polymethacrylamide in the silk fibroin structure regardless of the types of the dyestuffs. Furthermore, compared to the degummed silk, the colorfastness to washing of the MMA-grafted and MAA-grafted silks dyed with acid, basic, and curcumin dyestuffs were greatly improved. Colorfastness to both acid and basic perspirations with acid and basic dyestuffs was slightly improved, whereas perspiration fastness remained unchanged for curcumin dyeing without and with the presence of the mordant. Also, the low-light resistances of the degummed and grafted silks dyed by curcumin dyestuff were notably improved by the MMA and MAA grafting technique. © 2006 Wiley Periodicals, Inc.

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