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Topical therapeutic corneal and scleral tissue cross-linking solutions: in vitro formaldehyde release studies using cosmetic preservatives

机译:局部治疗性角膜和巩膜组织交联溶液:使用化妆品防腐剂进行体外甲醛释放研究

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摘要

Our recent tissue cross-linking studies using formaldehyde releasers (FARs) suggest that corneal and scleral tissue strengthening may be possible without using ultraviolet irradiation or epithelial removal, two requirements for the photochemical method in widespread clinical use. Thus, the present study was carried out in order to better understand these potential therapeutic solutions by studying the effects of concentration, pH, buffer, time, and tissue reactivity on formaldehyde release of these FARs. Three FARs, sodium hydroxymethyl glycinate (SMG), DMDM, and diazolidinyl urea (DAU) were studied using a chromotropic acid colorimetric FA assay. The effects of concentration, pH, and buffer were studied as well as the addition of corneal and scleral tissues. The main determinant of release was found to be dilution factor (concentration) in which maximal release was noted at the lowest concentrations studied (submillimolar). In time dependent studies, after 60 min, FA levels decreased by 38% for SMG, 30% for DMDM, and 19% for DAU with corneal tissue added; and by 40% for SMG, 40% for DMDM, and 15% for DAU with scleral tissue added. We conclude that concentration (dilution factor) was found to be the most important parameter governing the percent of FA released.
机译:我们最近使用甲醛释放剂(FARs)进行的组织交联研究表明,不使用紫外线照射或上皮去除就可以实现角膜和巩膜组织强化,这是光化学方法在临床上广泛应用的两个要求。因此,进行本研究是为了通过研究浓度,pH,缓冲液,时间和组织反应性对这些FAR释放甲醛的影响来更好地理解这些潜在的治疗方案。使用变色酸比色FA分析法研究了三个FAR,羟甲基甘氨酸钠(SMG),DMDM和重氮烷基脲(DAU)。研究了浓度,pH和缓冲液的影响,以及角膜和巩膜组织的添加。发现释放的主要决定因素是稀释因子(浓度),其中在所研究的最低浓度(亚毫摩尔)下注意到最大释放。在时间依赖性研究中,添加了角膜组织的SMG的FA水平在60分钟后降低了38%,DMDM降低了30%,DAU降低了19%。 SMG为40%,DMDM为40%,DAU为15%(添加了巩膜组织)。我们得出结论,发现浓度(稀释因子)是控制FA释放百分比的最重要参数。

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