The calcium alginate gel beads（CAGB） are modified via graft copolymerization with acrylonitrile（AN）. It is found that the grafting yield achieved 799% when 5.0 g CAGB（in diameter of 3.2 mm） is mixed with 0.033 9...The calcium alginate gel beads（CAGB） are modified via graft copolymerization with acrylonitrile（AN）. It is found that the grafting yield achieved 799% when 5.0 g CAGB（in diameter of 3.2 mm） is mixed with 0.033 9 mol/L K2S2O8 for 35 min at 51 ℃ and copolymerized with 2.85 mol/L AN for 4 h. The structure of CAGB-g-PAN is verified with FTIR. The compactness of CAGB and modified CAGB is investigated with fluorometry. It is found that the compactness of the gel beads is increased with the grafting yield. Modified CAGBs keep their integrity in the electrolyte solutions that are capable of decomposition of CAGB, indicating the stability of CAGB is greatly enhanced.展开更多
传统的亲水材料输送系统在实际应用中仍然面临着严峻的挑战,包括保留能力差和生物利用度低。该工作使用维生素C作为亲水性活性物的模型,将载有维生素C的油包水型Pickering乳液(Pickering emulsions,PE)包封进海藻酸钙胶囊(PE in alginat...传统的亲水材料输送系统在实际应用中仍然面临着严峻的挑战,包括保留能力差和生物利用度低。该工作使用维生素C作为亲水性活性物的模型,将载有维生素C的油包水型Pickering乳液(Pickering emulsions,PE)包封进海藻酸钙胶囊(PE in alginate capsules,PE@gel)中,利用Pickering乳液的纳米界面膜和水凝胶层的双重保护来提高其稳定性。扫描电镜和激光共聚焦显微镜研究证实,胶囊呈球形,Pickering乳液分布在凝胶网络中。傅里叶红外光谱研究表明,维生素C被物理包封在胶囊中,化学性质未改变。更重要的是,在25℃避光静置条件下,PE@gel与维生素C水溶液相比保留率和相对抗氧化活性分别提高了59.4倍和33.87倍;在紫外灯365 nm照射静置条件下,PE@gel与维生素C水溶液相比保留率和相对抗氧化活性分别提高了42.28倍和27.41倍。该方法为水溶性活性物在食品领域的贮存和应用提供了一个有效且通用的平台。展开更多
文摘The calcium alginate gel beads（CAGB） are modified via graft copolymerization with acrylonitrile（AN）. It is found that the grafting yield achieved 799% when 5.0 g CAGB（in diameter of 3.2 mm） is mixed with 0.033 9 mol/L K2S2O8 for 35 min at 51 ℃ and copolymerized with 2.85 mol/L AN for 4 h. The structure of CAGB-g-PAN is verified with FTIR. The compactness of CAGB and modified CAGB is investigated with fluorometry. It is found that the compactness of the gel beads is increased with the grafting yield. Modified CAGBs keep their integrity in the electrolyte solutions that are capable of decomposition of CAGB, indicating the stability of CAGB is greatly enhanced.
