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Author: search.filters.author.Monvisade, PathavuthSubject: search.filters.subject.Alginate

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    Thermochromic phase change beads based on phenolphthalein/ octadecylamine/ decanol for low-temperature indication and thermal buffering in cold chain logistics
    (2025-07-01)
    Thanaritthimanomai, Aunchisa
    ;
    Monvisade, Pathavuth
    This study presents the development of thermochromic phase change beads (TC-BPA) designed for low-temperature applications (0–5 °C) in cold chain logistics. The beads were fabricated by encapsulating a ternary system—comprising phenolphthalein (PHP) as the color former, octadecylamine (ODA) as the developer, and decanol (10OH) as the solvent—within an alginate shell using a simple extrusion-dripping technique. Optimization of the component ratios yielded uniformly spherical beads (1.82–2.20 mm diameter) with rapid and reversible color transitions. Notably, the optimal formulation (TC-BPA10) shifted from purple to pale pink within 10 s (ΔE = 61.46 ± 1.27) and turned completely white within 60 s (ΔE = 82.66 ± 0.77) at 25 °C. Differential scanning calorimetry revealed a melting temperature of 4.9 °C and a latent heat of 200.05 J/g, with only a slight decrease after 100 thermal cycles. Additionally, TC-BPA10 maintained a stable temperature range (–2.2 °C to 2.9 °C) for approximately 28 min, demonstrating effective thermal buffering. These properties suggest that TC-BPA10 is a promising candidate for integrated temperature monitoring and energy storage in smart refrigerated packaging in cold chain logistics.
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    Bioactive alginate/carrageenan/calcium silicate porous scaffolds for bone tissue engineering
    (2021-03-01)
    Sathain, Ammara
    ;
    Monvisade, Pathavuth
    ;
    Siriphannon, Punnama
    Porous bioactive alginate/carrageenan/calcium silicate scaffolds for bone tissue engineering were fabricated. The scaffolds were prepared by dispersing the synthesized calcium silicate in an aqueous solution of alginate and carrageenan at 90 °C. The scaffolds were shaped by freeze-drying and further crosslinked by 0.5, 1.0 and 1.5 M CaCl<inf>2</inf> for 60 and 120 min. The scaffolds crosslinked by 1.5 M CaCl<inf>2</inf> for 120 min achieved the highest in vitro dimension stability. The formation of hydroxyapatite crystals was observed on the scaffolds surface after soaking in simulated body fluid (SBF) at 37 °C for 7–28 days, indicating in vitro bioactivity of the scaffolds. The presence of calcium silicate could enhance not only the bioactivity, but also the mechanical properties of the scaffolds comparable to the cancellous bone. Moreover, the dimension and mechanical properties of the wet scaffolds could recover to the original after four cycles of mechanical testing at 50 % strain. The scaffolds were nontoxic to human living cells, in which the in vitro drug release behavior of the scaffold using diclofenac as a model drug was suitable for the treatment of acute inflammation after surgery. Therefore, these scaffolds were considered to be the candidate materials for bone replacement.