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| Chemical characterization, release, and bioactivity of Eucalyptus camaldulensis polyphenols from freeze-dried sodium alginate and sodium carboxymethyl cellulose matrix |
| Ozioma Forstinus Nwabor, Sudarshan Singh, Dwi Marlina,
Supayang Piyawan Voravuthikunchai |
| Excellence Research Laboratory on Natural Products, Department of Microbiology, Faculty of Science and Natural
Product Research Center of Excellence, Prince of Songkla University, Hat Yai, Songkhla, Thailand |
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Abstract Crude ethanolic extract of Eucalyptus camaldulensis was encapsulated with sodium alginate–sodium carboxymethyl cellulose (CMC) using freeze-drying techniques. The microcapsules were characterized for particle size, morphology, physicochemical parameters, and micromeritics properties. Antioxidant and antimicrobial activities of the microcapsules were also demonstrated. Results revealed an irregular-shaped microparticles with a mean diameter ranging from 6.7 to 26.6 μm. Zeta potential and polydispersity index ranged from ?17.01 to 2.23 mV and 0.34 to 0.49, respectively. Percentage yield ranged between 70.4 and 81.5 per cent whereas encapsulation efficiency ranged between 74.2 ± 0.011 and 82.43 ± 0.77 per cent. Swelling index and solubility varied inversely with extract concentration, with a range of 54.4%–84.0% and 18.8%–22.2%, respectively. Antioxidant activities varied directly with the concentration of the extract. Minimum inhibitory and minimum bactericidal concentrations of the microcapsules against Gram-positive foodborne pathogens ranged from 0.19 to 3.12 and 0.19–12.25 mg/ml, respectively. The Higuchi model indicated a time-dependent, delayed, and regulated release of polyphenols at 37°C. The results suggested that alginate–CMC possessed good encapsulant properties that preserved the bioactive extract, thus might be employed for application of natural products in food systems.
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Corresponding Authors:
Supayang Piyawan Voravuthikunchai
E-mail: supayang.v@psu.ac.th
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冻干海藻酸钠和羧甲基纤维素钠基质中的赤桉多酚的化学表征，释放和生物活性
用冷冻干燥技术将赤桉粗乙醇提取物用海藻酸钠-羧甲基纤维素钠（CMC）封装。对微胶囊的粒径、形态、理化参数和微观性能进行了表征，并对微胶囊的抗氧化和抗菌活性进行了研究。结果显示，微胶囊呈不规则状，平均粒径为6.7 ~ 26.6 μm。 Zeta电位和多分散指数分别为-17.01 ~ 2.23 mV和0.34 ~ 0.49。产率百分比在70.4％ ~ 81.5％之间，而包封率在74.2 ± 0.011％ ~ 82.43 ± 0.77％之间。溶胀指数和溶解度与提取物浓度成反比，其变化范围分别为54.4% ~ 84.0%和18.8% ~ 22.2%。抗氧化活性与提取物浓度直接相关。微胶囊对革兰氏阳性食源性致病菌的最低抑菌浓度和最低杀菌浓度分别为0.19 ～ 3.12和0.19 ～ 12.25 mg/mL。Higuchi模型显示37 ℃下多酚的释放具有时间依赖性、延迟性和调节性。结果表明，海藻酸钠-羧甲基纤维素（CMC）具有良好的包封性能，能够保存生物活性提取物，因此可用于天然产物在食品系统中的应用。
关键词：
微胶囊化,
冻干,
抗菌,
抗氧化,
赤桉,
调节释放
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