Abstract:
:Aggregation may compromise the stability as well as the biological activity of protein drugs. Detection of protein aggregates is needed in the process of protein characterization and during optimization of pharmaceutical formulations. This paper describes a technique, which consists of analysing protein aggregates by fluorescence microscopy after staining with the hydrophobic probe Nile Red. Dilution, filtration or other modifications of the sample are not needed. Assessment of aggregation was possible in highly concentrated protein samples (193 mg/ml). Fluorescence microscopy observations allowed the detection and characterization of protein aggregates not easily detected by spectroscopic techniques. Nile Red was shown to be very sensitive for the detection and analysis of immunoglobulin aggregates. Nile Red, Congo red and Thioflavine T stainings were compared. Nile Red and Thioflavine T fluorescence were colocalized. The diameter of immunoglobulin aggregates was determined, and the number of aggregates was correlated with 90 degrees light scattering measurements. Studies of human calcitonin aggregates brought to light new aspects of the human calcitonin aggregation mechanisms. Thus, Nile Red staining not only allows detection of very low levels of protein aggregates, but also contributes to a better understanding of the complex mechanisms governing protein aggregation.
journal_name
Int J Pharmjournal_title
International journal of pharmaceuticsauthors
Demeule B,Gurny R,Arvinte Tdoi
10.1016/j.ijpharm.2006.08.024subject
Has Abstractpub_date
2007-02-01 00:00:00pages
37-45issue
1-2eissn
0378-5173issn
1873-3476pii
S0378-5173(06)00684-3journal_volume
329pub_type
杂志文章abstract::The transmucosal routes such as pulmonary, nasal and oral routes are most important and common routes for drug delivering to the body. However, peptide and protein drugs are degraded before they reach the blood stream and cannot cross the mucosal barriers. The mucoadhesive polymer-coated nanoparticles colloidal carrie...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2006.02.031
更新日期:2006-06-19 00:00:00
abstract::In the 1990s chitosan turned out to be a useful excipient in various pharmaceutical formulations. By modifications of the primary amino group at the 2-position of this poly(beta1-->4 D-glucosamine), the features of chitosan can even be optimised according to a given task in drug delivery systems. For peroral peptide d...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章,评审
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journal_title:International journal of pharmaceutics
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journal_title:International journal of pharmaceutics
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journal_title:International journal of pharmaceutics
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更新日期:2016-03-16 00:00:00
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journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2013.03.057
更新日期:2013-05-20 00:00:00
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journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2013.07.025
更新日期:2013-10-15 00:00:00
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doi:10.1016/j.ijpharm.2015.12.063
更新日期:2016-02-29 00:00:00
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journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2006.09.055
更新日期:2007-03-06 00:00:00
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doi:10.1016/j.ijpharm.2017.06.085
更新日期:2017-08-30 00:00:00
abstract::A certain number of filters have notable anti-inflammatory properties with percentage inhibition of PMA-induced edema in mice at over 70%. The question arose as to whether this effect was likely to continue after UV irradiation. It can be noted that 7 filters retain an equivalent anti-inflammatory effect before and af...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2013.04.067
更新日期:2013-08-16 00:00:00
abstract::A series of mesocellular foams (MCFs)-based mesoporous silica nanospheres (DH-MCF-P123-n, (n=12, 2, 0.5)) were synthesized as controlled-release deliveries for a typical antidepressant drug, venlafaxine. The foams were 3-(2,3-dihydroxypropoxyl)propyl-grafted and the P123 template partially preserved. We studied the re...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2011.12.048
更新日期:2012-03-15 00:00:00
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journal_title:International journal of pharmaceutics
pub_type: 杂志文章
doi:10.1016/j.ijpharm.2014.03.024
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journal_title:International journal of pharmaceutics
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doi:10.1016/j.ijpharm.2004.12.014
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abstract::Alpha-lactose monohydrate was prepared to have different morphological features but with similar particle size. The crystal shape and surface smoothness of lactose were quantified by a number of shape descriptors and these were supported qualitatively by the visual examination of scanning electron (SE) micrographs of ...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章
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更新日期:2000-04-25 00:00:00
abstract::Insulin replacement therapy is integral to the management of type 1 diabetes, which is characterised by absolute insulin deficiency. Optimal glycaemic control, as assessed by glycated haemoglobin, and avoidance of hyper- and hypoglycaemic excursions have been shown to prevent diabetes-related complications. Insulin pu...
journal_title:International journal of pharmaceutics
pub_type: 杂志文章,评审
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更新日期:2018-06-15 00:00:00
abstract::A wet-primed ready-to-use extracorporeal membrane oxygenation (ECMO) circuit is used in some centres for rapid deployment of ECMO during cardiopulmonary resuscitation. Yet, the potential release of plasticizer di(2-ethylhexyl)phthalate (DEHP) from the polyvinyl chloride tubing in the circuit during storage is a concer...
journal_title:International journal of pharmaceutics
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journal_title:International journal of pharmaceutics
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更新日期:2016-09-10 00:00:00
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journal_title:International journal of pharmaceutics
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doi:10.1016/j.ijpharm.2015.01.046
更新日期:2015-03-15 00:00:00
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更新日期:2020-06-30 00:00:00