Quinoa starch granules: a candidate for stabilising food-grade Pickering emulsions
Quinoa starch granules: a candidate for stabilising food-grade Pickering emulsions
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DOI：
10.1002/jsfa.5610
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发表时间：
2012-07-01
影响因子：
4.1
通讯作者：
Dejmek, Petr
中科院分区：
文献类型：
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作者：
Rayner, Marilyn;Timgren, Anna;Dejmek, Petr
背景：众所周知，颗粒稳定乳液，即所谓的皮克林乳液，具有许多有益的特性，包括极其稳定。从藜麦中分离出的淀粉颗粒已被用作乳液稳定颗粒。颗粒是完整的，直径为1-3μm，并用辛烯基琥珀酸酐改性以增加其疏水性。与用于生成皮克林乳液的大多数其他颗粒不同，淀粉颗粒是可食用的、丰富的且源自天然来源。结果：通过高剪切均化产生的乳液的液滴尺寸为 9-70 μm，具体取决于淀粉与油的比例。液滴尺寸随着淀粉与油比例的增加而减小，但在 5-33% 油 (v/v) 范围内不受油相体积的影响。尽管水滴很大并且容易乳化，但它们的大小在 7 天的时间内保持不变。通过调整淀粉与油的比例，可以使液滴呈现中性浮力，以防止乳化。流变学表征表明凝胶结构的弹性模量在 200-2000 Pa 范围内，具体取决于液滴尺寸。结论：这项工作证明了淀粉颗粒稳定乳液的成功应用，其应用可能超出食品领域，例如化妆品和药物配方。版权所有(C)2012 中国化工学会
BACKGROUND: Particle-stabilised emulsions, so-called Pickering emulsions, are known to possess many beneficial properties, including being extremely stable. Starch granules isolated from quinoa have been used as emulsion stabilising particles. The granules were intact, 1-3 mu m in diameter and modified with octenyl succinic anhydride to increase their hydrophobicity. Starch granules, as opposed to most other particles used to generate Pickering emulsions, are edible, abundant and derived from natural sources. RESULTS: Emulsions produced by high shear homogenisation had droplet sizes of 9-70 mu m depending on the starch-to-oil ratio. Droplet size decreased with increasing starch-to-oil ratio, but was unaffected by the oil phase volume over a range of 5-33% oil (v/v). Although the drops were large and subject to creaming, their size remained unchanged over a period of 7 days. By adjusting the starch-to-oil ratio drops could be made to be buoyancy neutral to prevent creaming. Rheological characterisation indicated a gel structure with an elastic modulus in the range 200-2000 Pa depending on droplet size. CONCLUSION: This work has demonstrated the successful use of starch granules to stabilise emulsions which may find applications beyond that of food, for example in cosmetics and pharmaceutical formulations. Copyright (C) 2012 Society of Chemical Industry