Institute of Biopharmaceutical Technology, University of Applied Sciences Giessen-Friedberg, 35390 Giessen, Germany.
Int J Pharm. 2010 Oct 15;398(1-2):107-13. doi: 10.1016/j.ijpharm.2010.07.037. Epub 2010 Jul 30.
Multiple water-in-oil-in-water (W/O/W) emulsions are of major interest as potential skin delivery systems for water-soluble drugs like oligonucleotides due to their distinct encapsulation properties. However, multiple emulsions are highly sensitive in terms of variations of the individual components. The presence of osmotic active ingredients in the inner water phase is crucial for the generation of stable multiple emulsions. In order to stabilize the emulsions the influence of NaCl, MgSO(4), glucose and glycine and two cellulose derivatives was investigated. Briefly, multiple W/O/W emulsions using Span 80 as a lipophilic emulsifier and different hydrophilic emulsifiers (PEG-40/50 stearate, steareth-20 and polysorbate 80) were prepared. Stability of the emulsions was analyzed over a period of time using rheological measurements, droplet size observations and conductivity analysis. In this study we show that additives strongly influence the properties stability of multiple emulsions. By increasing the concentration of the osmotic active ingredients, smaller multiple droplets are formed and the viscosity is significantly increased. The thickening agents resulted in a slightly improved stability. The most promising emulsions were chosen and further evaluated for their suitability and compatibility to incorporate a DNAzyme oligonucleotide as active pharmaceutical ingredient.
多重 W/O/W 乳液作为水溶性药物(如寡核苷酸)的潜在皮肤传递系统引起了广泛关注,这是由于它们具有独特的包封特性。然而,多重乳液在各个成分的变化方面非常敏感。内水相存在渗透压活性成分对于稳定的多重乳液的产生至关重要。为了稳定乳液,研究了 NaCl、MgSO4、葡萄糖和甘氨酸以及两种纤维素衍生物的影响。简要地说,使用 Span 80 作为亲脂性乳化剂和不同的亲水性乳化剂(PEG-40/50 硬脂酸酯、硬脂醇聚醚-20 和聚山梨酯 80)制备了多重 W/O/W 乳液。通过流变测量、液滴尺寸观察和电导率分析,在一段时间内分析了乳液的稳定性。在这项研究中,我们表明添加剂强烈影响多重乳液的稳定性。通过增加渗透压活性成分的浓度,可以形成更小的多重液滴,并且粘度显著增加。增稠剂略微提高了稳定性。选择了最有前途的乳液,并进一步评估它们的适用性和与作为活性药物成分的 DNA 酶寡核苷酸的相容性。
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