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Foley L, Ziaee A, Walker G, O’Reilly E. Pulmonary Inhalation of Biotherapeutics: A Systematic Approach to Understanding the Effects of Atomisation Gas Flow Rate on Particle Physiochemical Properties and Retained Bioactivity. Pharmaceutics 2024; 16:1020. [PMID: 39204365 PMCID: PMC11359500 DOI: 10.3390/pharmaceutics16081020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2024] [Revised: 07/17/2024] [Accepted: 07/22/2024] [Indexed: 09/04/2024] Open
Abstract
The identification of spray-drying processing parameters capable of producing particles suitable for pulmonary inhalation with retained bioactivity underpins the development of inhalable biotherapeutics. Effective delivery of biopharmaceuticals via pulmonary delivery routes such as dry powder inhalation (DPI) requires developing techniques that engineer particles to well-defined target profiles while simultaneously minimising protein denaturation. This study examines the simultaneous effects of atomisation gas flow rate on particle properties and retained bioactivity for the model biopharmaceutical lysozyme. The results show that optimising the interplay between atomisation gas flow rate and excipient concentration enables the production of free-flowing powder with retained bioactivity approaching 100%, moisture content below 4%, and D50 < 4 µm, at yields exceeding 50%. The developed methodologies inform the future design of protein-specific spray-drying parameters for inhalable biotherapeutics.
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Affiliation(s)
| | | | | | - Emmet O’Reilly
- SSPC the SFI Research Centre for Pharmaceuticals, Department of Chemical Sciences, Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland; (L.F.); (A.Z.); (G.W.)
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2
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Zhang Y, Ballesteros ME, Schöneich C. Photo-induced site-specific oxidative fragmentation of IgG1 mediated by iron(III)-containing histidine buffer: Mechanistic studies and excipient effects. Eur J Pharm Biopharm 2023; 190:121-130. [PMID: 37482364 DOI: 10.1016/j.ejpb.2023.07.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 07/14/2023] [Accepted: 07/21/2023] [Indexed: 07/25/2023]
Abstract
Fragmentation may compromise the clinical efficacy and safety profile of monoclonal antibodies (mAbs). We recently reported that Fe(III)-containing histidine (His) buffer mediates site-specific mAb fragmentation within the Fc domain when exposed to visible light (Y. Zhang and C. Schöneich, Mol. Pharm. 2023, 20, 650-662). Here, we show that this fragmentation proceeds even more efficiently under near-UV light. Several formulation strategies were applied in an attempt to reduce the photo-induced fragmentation. In solution formulations, the fragmentation can be mitigated by reducing the concentration of His buffer, adding Fe(III)-chelating agents, and replacing His with other amino acids. Fragmentation can be almost completely inhibited by formulating the protein in the lyophilized state. Mechanistically, His plays a critical role in the fragmentation process, likely due to its affinity for Fe(II), driving a photo-redox reaction towards product formation.
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Affiliation(s)
- Yilue Zhang
- Department of Pharmaceutical Chemistry, University of Kansas, 2093 Constant Avenue, Lawrence, KS 66047, USA
| | | | - Christian Schöneich
- Department of Pharmaceutical Chemistry, University of Kansas, 2093 Constant Avenue, Lawrence, KS 66047, USA.
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3
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Chen Y, Mutukuri TT, Wilson NE, Zhou QT. Pharmaceutical protein solids: Drying technology, solid-state characterization and stability. Adv Drug Deliv Rev 2021; 172:211-233. [PMID: 33705880 PMCID: PMC8107147 DOI: 10.1016/j.addr.2021.02.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 01/18/2021] [Accepted: 02/22/2021] [Indexed: 01/30/2023]
Abstract
Despite the boom in biologics over the past decade, the intrinsic instability of these large molecules poses significant challenges to formulation development. Almost half of all pharmaceutical protein products are formulated in the solid form to preserve protein native structure and extend product shelf-life. In this review, both traditional and emerging drying techniques for producing protein solids will be discussed. During the drying process, various stresses can impact the stability of protein solids. However, understanding the impact of stress on protein product quality can be challenging due to the lack of reliable characterization techniques for biological solids. Both conventional and advanced characterization techniques are discussed including differential scanning calorimetry (DSC), solid-state Fourier transform infrared spectrometry (ssFTIR), solid-state fluorescence spectrometry, solid-state hydrogen deuterium exchange (ssHDX), solid-state nuclear magnetic resonance (ssNMR) and solid-state photolytic labeling (ssPL). Advanced characterization tools may offer mechanistic investigations into local structural changes and interactions at higher resolutions. The continuous exploration of new drying techniques, as well as a better understanding of the effects caused by different drying techniques in solid state, would advance the formulation development of biological products with superior quality.
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Affiliation(s)
- Yuan Chen
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, USA
| | - Tarun Tejasvi Mutukuri
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, USA
| | - Nathan E Wilson
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, USA
| | - Qi Tony Zhou
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, USA.
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4
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Xia Z, Lau BLT. Mitigating effects of osmolytes on the interactions between nanoparticles and supported lipid bilayer. J Colloid Interface Sci 2020; 568:1-7. [PMID: 32070850 DOI: 10.1016/j.jcis.2020.02.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 02/11/2020] [Accepted: 02/11/2020] [Indexed: 10/25/2022]
Abstract
To maintain osmotic balance, cells usually produce neutral solutes (i.e., osmolytes), together with charged species to cope with salinity stress. Osmolytes are known to be important in stabilizing/destabilizing macromolecules (e.g., proteins) via depletion /accumulation around their surfaces. To better understand the physiological fate of nanoparticles (NPs), we investigated the effect of osmolytes [(urea and trimethylamine N-oxide (TMAO)] and specific anions (NO3- and F-) on the interactions between NPs and supported lipid bilayers (SLBs). Carboxylated polystyrene NPs (60 nm) and 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) were chosen as model NPs and lipid. Quartz crystal microbalance with dissipation monitoring (QCM-D) was used to quantify NP deposition dynamics. Microscale thermophoresis (MST) was used to characterize the affinity between DOPC vesicles (or NPs) and osmolytes. Our results show that osmolytes are capable of protecting SLBs from NP-induced disruption. Upon NP deposition onto supported vesicle layers (SVLs), the leakage of encapsulated dyes decreased with the addition of osmolytes. The combination of kosmotropes (TMAO and F-) are more efficient than that of chaotropes (urea and NO3-) in weakening the hydrophobic interaction between NPs and SLBs by preferential binding to NPs and/or SLBs.
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Affiliation(s)
- Zehui Xia
- Department of Civil & Environmental Engineering, University of Massachusetts Amherst, 130 Natural Resources Road, Amherst, MA 01003, USA
| | - Boris L T Lau
- Department of Civil & Environmental Engineering, University of Massachusetts Amherst, 130 Natural Resources Road, Amherst, MA 01003, USA.
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5
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Kushwah N, Jain V, Yadav D. Osmolytes: A Possible Therapeutic Molecule for Ameliorating the Neurodegeneration Caused by Protein Misfolding and Aggregation. Biomolecules 2020; 10:biom10010132. [PMID: 31941036 PMCID: PMC7022651 DOI: 10.3390/biom10010132] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 01/09/2020] [Accepted: 01/11/2020] [Indexed: 12/20/2022] Open
Abstract
Most of the neurological disorders in the brain are caused by the abnormal buildup of misfolded or aggregated proteins. Osmolytes are low molecular weight organic molecules usually built up in tissues at a quite high amount during stress or any pathological condition. These molecules help in providing stability to the aggregated proteins and protect these proteins from misfolding. Alzheimer’s disease (AD) is the uttermost universal neurological disorder that can be described by the deposition of neurofibrillary tangles, aggregated/misfolded protein produced by the amyloid β-protein (Aβ). Osmolytes provide stability to the folded, functional form of a protein and alter the folding balance away from aggregation and/or degradation of the protein. Moreover, they are identified as chemical chaperones. Brain osmolytes enhance the pace of Aβ aggregation, combine with the nearby water molecules more promptly, and avert the aggregation/misfolding of proteins by providing stability to them. Therefore, osmolytes can be employed as therapeutic targets and may assist in potential drug design for many neurodegenerative and other diseases.
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Affiliation(s)
- Neetu Kushwah
- Functional Genomics Unit, CSIR-institute of genomics and integrative biology, Mall road, Delhi 110007, India;
| | - Vishal Jain
- Department of ECE, Carnegie Mellon University, Pittsburgh, PA 15289, USA
- Correspondence: (V.J.); (D.Y.); Tel.: +1-412-251-3042 (V.J.); +82-10-2202-1191(D.Y.)
| | - Dhananjay Yadav
- Department of Medical Biotechnology, Yeungnam University, Gyeongsan 712-749, Korea
- Correspondence: (V.J.); (D.Y.); Tel.: +1-412-251-3042 (V.J.); +82-10-2202-1191(D.Y.)
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6
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Understanding the Role of Preferential Exclusion of Sugars and Polyols from Native State IgG1 Monoclonal Antibodies and its Effect on Aggregation and Reversible Self-Association. Pharm Res 2019; 36:109. [DOI: 10.1007/s11095-019-2642-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2019] [Accepted: 05/07/2019] [Indexed: 11/27/2022]
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7
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Li T, Zhang Y, Wang D, Liu Y, Dirk LMA, Goodman J, Downie AB, Wang J, Wang G, Zhao T. Regulation of Seed Vigor by Manipulation of Raffinose Family Oligosaccharides in Maize and Arabidopsis thaliana. MOLECULAR PLANT 2017; 10:1540-1555. [PMID: 29122666 DOI: 10.1016/j.molp.2017.10.014] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 10/29/2017] [Accepted: 10/31/2017] [Indexed: 05/28/2023]
Abstract
Raffinose family oligosaccharides (RFOs) accumulate in seeds during maturation desiccation in many plant species. However, it remains unclear whether RFOs have a role in establishing seed vigor. GALACTINOL SYNTHASE (GOLS), RAFFINOSE SYNTHASE (RS), and STACHYOSE SYNTHASE (STS) are the enzymes responsible for RFO biosynthesis in plants. Interestingly, only raffinose is detected in maize seeds, and a unique maize RS gene (ZmRS) was identified. In this study, we found that two independent mutator (Mu)-interrupted zmrs lines, containing no raffinose but hyperaccumulating galactinol, have significantly reduced seed vigor, compared with null segregant controls. Unlike maize, Arabidopsis thaliana seeds contain several RFOs (raffinose, stachyose, and verbascose). Manipulation of A. thaliana RFO content by overexpressing ZmGOLS2, ZmRS, or AtSTS demonstrated that co-overexpression of ZmGOLS2 and ZmRS, or overexpression of ZmGOLS2 alone, significantly increased the total content of RFOs and enhanced Arabidopsis seed vigor. Surprisingly, while overexpression of ZmRS increased seed raffinose content, its overexpression dramatically decreased seed vigor and reduced the seed amounts of galactinol, stachyose, and verbascose. In contrast, the atrs5 mutant seeds are similar to those of the wild type with regard to seed vigor and RFO content, except for stachyose, which accumulated in atrs5 seeds. Total RFOs, RFO/sucrose ratio, but not absolute individual RFO amounts, positively correlated with A. thaliana seed vigor, to which stachyose and verbascose contribute more than raffinose. Taken together, these results provide new insights into regulatory mechanisms of seed vigor and reveal distinct requirement for RFOs in modulating seed vigor in a monocot and a dicot.
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Affiliation(s)
- Tao Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China; The Key Laboratory of Biology and Genetics Improvement of Maize in Arid Area of Northwest Region, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yumin Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China; The Key Laboratory of Biology and Genetics Improvement of Maize in Arid Area of Northwest Region, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Dong Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China; The Key Laboratory of Biology and Genetics Improvement of Maize in Arid Area of Northwest Region, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Ying Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China; The Key Laboratory of Biology and Genetics Improvement of Maize in Arid Area of Northwest Region, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Lynnette M A Dirk
- Department of Horticulture, Seed Biology, College of Agriculture, Food, and Environment, University of Kentucky, Lexington, KY 40546, USA
| | - Jack Goodman
- Department of Plant and Soil Sciences, College of Agriculture, Food, and Environment, University of Kentucky, Lexington, KY 40546, USA
| | - A Bruce Downie
- Department of Horticulture, Seed Biology, College of Agriculture, Food, and Environment, University of Kentucky, Lexington, KY 40546, USA
| | - Jianmin Wang
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Guoying Wang
- Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
| | - Tianyong Zhao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China; The Key Laboratory of Biology and Genetics Improvement of Maize in Arid Area of Northwest Region, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China.
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8
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Roy A, Dutta R, Kundu N, Banik D, Sarkar N. A Comparative Study of the Influence of Sugars Sucrose, Trehalose, and Maltose on the Hydration and Diffusion of DMPC Lipid Bilayer at Complete Hydration: Investigation of Structural and Spectroscopic Aspect of Lipid-Sugar Interaction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:5124-5134. [PMID: 27133799 DOI: 10.1021/acs.langmuir.6b01115] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
It is well-known that sugars protect membrane structures against fusion and leakage. Here, we have investigated the interaction between different sugars (sucrose, trehalose, and maltose) and phospholipid membrane of 1,2-dimyristoyl-sn-glycero-3-phoshpocholine (DMPC) using dynamic light scattering (DLS), transmission electron microscopy (TEM), and other various spectroscopic techniques. DLS measurement reveals that the addition of sugar molecule results a significant increase of the average diameter of DMPC membrane. We have also noticed that in the presence of different sugars the rotational relaxation and solvation time of coumarin 480 (C480) and coumarin 153 (C153) surrounding DMPC membrane increases, suggesting a marked reduction of the hydration behavior at the surface of phospholipid membrane. In addition, we have also investigated the effect of sugar molecules on the lateral mobility of phospholipids. Interestingly, the relative increase in rotational, solvation and lateral diffusion is more prominent for C480 than that of C153 because of their different location in lipid bilayer. It is because of preferential location of comparatively hydrophilic probe C480 in the interfacial region of the lipid bilayer. Sugars intercalate with the phospholipid headgroup through hydrogen bonding and replace smaller sized water molecules from the membrane surface. Therefore, overall, we have monitored a comparative analysis regarding the interaction of different sugar molecules (sucrose, trehalose, and maltose) with the DMPC membrane through DLS, TEM, solvation dynamics, time-resolved anisotropy, and fluorescence correlation spectroscopy (FCS) measurements to explore the structural and spectroscopic aspect of lipid-sugar interaction.
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Affiliation(s)
- Arpita Roy
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Rupam Dutta
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Debasis Banik
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology , Kharagpur 721302, WB, India
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9
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Roy A, Kundu N, Banik D, Sarkar N. Comparative Fluorescence Resonance Energy-Transfer Study in Pluronic Triblock Copolymer Micelle and Niosome Composed of Biological Component Cholesterol: An Investigation of Effect of Cholesterol and Sucrose on the FRET Parameters. J Phys Chem B 2015; 120:131-42. [PMID: 26672631 DOI: 10.1021/acs.jpcb.5b09761] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arpita Roy
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Debasis Banik
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
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10
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Inhibition of insulin fibrillation by osmolytes: Mechanistic insights. Sci Rep 2015; 5:17599. [PMID: 26616401 PMCID: PMC4663473 DOI: 10.1038/srep17599] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 10/23/2015] [Indexed: 01/26/2023] Open
Abstract
We have studied here using a number of biophysical tools the effects of osmolytes, betaine, citrulline, proline and sorbitol which differ significantly in terms of their physical characteristics such as, charge distribution, polarity, H-bonding abilities etc, on the fibrillation of insulin. Among these, betaine, citrulline, and proline are very effective in decreasing the extent of fibrillation. Proline also causes a substantial delay in the onset of fibrillation in the concentration range (50–250 mM) whereas such an effect is seen for citrulline only at 250 mM, and in case of betaine this effect is not seen at all in the whole concentration range. The enthalpies of interaction at various stages of fibrillation process have suggested that the preferential exclusion of the osmolyte and its polar interaction with the protein are important in inhibition. The results indicate that the osmolytes are most effective when added prior to the elongation stage of fibrillation. These observations have significant biological implications, since insulin fibrillation is known to cause injection amyloidosis and our data may help in designing lead drug molecules and development of potential therapeutic strategies.
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Soltanizadeh N, Mirmoghtadaie L, Nejati F, Najafabadi LI, Heshmati MK, Jafari M. Solid-State Protein-Carbohydrate Interactions and Their Application in the Food Industry. Compr Rev Food Sci Food Saf 2014. [DOI: 10.1111/1541-4337.12089] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Nafiseh Soltanizadeh
- Dept. of Food Science and Technology; College of Agriculture; Isfahan Univ. of Technology; Isfahan 84156-83111 Iran
| | - Leila Mirmoghtadaie
- Dept. of Food Science and Technology; Natl. Nutrition and Food Technology Research Inst; College of Nutrition Science and Food Technology; Shahid Beheshti Univ. of Medical Science; Tehran 1981619573 Iran
| | - Fatemeh Nejati
- Dept. of Food Science and Technology; College of Agriculture; Islamic Azad Univ. (Shahrekord Branch); Shahrekord Iran
| | - Leila Izadi Najafabadi
- Dept. of Food Science and Technology; College of Agriculture; Isfahan Univ. of Technology; Isfahan 84156-83111 Iran
| | - Maryam Khakbaz Heshmati
- Dept. of Food Science and Technology; Ahar Faculty of Agriculture and Natural Resources, Univ. of Tabriz; 51664-16471 Tabriz Iran
| | - Maryam Jafari
- Dept. of Food Science and Technology; College of Agriculture; Isfahan Univ. of Technology; Isfahan 84156-83111 Iran
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12
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Nicora CD, Anderson BJ, Callister SJ, Norbeck AD, Purvine SO, Jansson JK, Mason OU, David MM, Jurelevicius D, Smith RD, Lipton MS. Amino acid treatment enhances protein recovery from sediment and soils for metaproteomic studies. Proteomics 2013; 13:2776-85. [PMID: 23776032 DOI: 10.1002/pmic.201300003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2013] [Revised: 04/23/2013] [Accepted: 05/10/2013] [Indexed: 11/07/2022]
Abstract
Characterization of microbial protein expression provides information necessary to better understand the unique biological pathways that occur within soil microbial communities that contribute to atmospheric CO2 levels and the earth's changing climate. A significant challenge in studying the soil microbial community proteome is the initial dissociation of bacterial proteins from the complex mixture of particles found in natural soil. The differential extraction of intact bacterial cells limits the characterization of the complete representation of a microbial community. However, in situ lysis of bacterial cells in soil can lead to potentially high levels of protein adsorption to soil particles. Here, we investigated various amino acids for their ability to block soil protein adsorption sites prior to in situ lysis of bacterial cells, as well as their compatibility with both tryptic digestion and mass spectrometric analysis. The treatments were tested by adding proteins from lysed Escherichia coli cells to representative treated and untreated soil samples. The results show that it is possible to significantly increase protein identifications through blockage of binding sites on a variety of soil and sediment textures; use of an optimized desorption buffer further increases the number of identifications.
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13
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El-Sayed AKA, Abou Dobara MI, El-Fallal AA, Omar NF. Purification, Sequencing, and Biochemical Characterization of a Novel Calcium-Independent α-Amylase AmyTVE from Thermoactinomyces vulgaris. Appl Biochem Biotechnol 2013; 170:483-97. [DOI: 10.1007/s12010-013-0201-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2012] [Accepted: 03/18/2013] [Indexed: 11/27/2022]
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14
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Chou DK, Krishnamurthy R, Manning MC, Randolph TW, Carpenter JF. Physical Stability of Albinterferon-α2b in Aqueous Solution: Effects of Conformational Stability and Colloidal Stability on Aggregation. J Pharm Sci 2012; 101:2702-19. [DOI: 10.1002/jps.23215] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Revised: 03/28/2012] [Accepted: 05/08/2012] [Indexed: 11/12/2022]
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15
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NíÓgáin O, Tajber L, Corrigan OI, Healy AM. Spray drying from organic solvents to prepare nanoporous/nanoparticulate microparticles of protein: excipient composites designed for oral inhalation. J Pharm Pharmacol 2012; 64:1275-90. [DOI: 10.1111/j.2042-7158.2012.01488.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Abstract
Objectives
The aim of this study was to determine if spray-drying could successfully produce microparticles containing the model protein trypsin in a form suitable for inhalation.
Methods
Trypsin was spray-dried with raffinose from a methanol : n-butyl acetate solvent system (MeOH : BA). The solvent system was then adjusted to include water, and trypsin was co-spray-dried with raffinose, trehalose or hydroxpropyl-β-cyclodextrin. The spray-dried products were characterised by SEM, XRD, DSC, TGA and FTIR. Protein biological activity and in-vitro deposition of trypsin : excipient nanoporous/nanoparticulate microparticles (NPMPs) was also assessed.
Key findings
The inclusion of water in a MeOH : BA solvent system allowed for the successful production of NPMPs of trypsin : excipient by spray-drying. Trypsin formulated as trypsin : excipient NPMPs retained biological activity on processing and showed no deterioration in activity or morphological characteristics when stored with desiccant at either 4 or 25°C. Hydroxpropyl-β-cyclodextrin showed advantages over the sugars in terms of producing powders with appropriate density and with greater physical stability under high-humidity conditions. Fine particle fractions of between 41 and 45% were determined for trypsin : excipient NPMPs.
Conclusions
NPMPs of trypsin : excipient systems can be produced by spray-drying by adjustment of the solvent system to allow for adequate solubility of trypsin.
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Affiliation(s)
- Orla NíÓgáin
- School of Pharmacy and Pharmaceutical Sciences, University of Dublin, Trinity College Dublin, Dublin, Ireland
| | - Lidia Tajber
- School of Pharmacy and Pharmaceutical Sciences, University of Dublin, Trinity College Dublin, Dublin, Ireland
| | - Owen I Corrigan
- School of Pharmacy and Pharmaceutical Sciences, University of Dublin, Trinity College Dublin, Dublin, Ireland
| | - Anne Marie Healy
- School of Pharmacy and Pharmaceutical Sciences, University of Dublin, Trinity College Dublin, Dublin, Ireland
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16
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Kamerzell TJ, Esfandiary R, Joshi SB, Middaugh CR, Volkin DB. Protein-excipient interactions: mechanisms and biophysical characterization applied to protein formulation development. Adv Drug Deliv Rev 2011; 63:1118-59. [PMID: 21855584 DOI: 10.1016/j.addr.2011.07.006] [Citation(s) in RCA: 350] [Impact Index Per Article: 26.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2011] [Revised: 07/19/2011] [Accepted: 07/26/2011] [Indexed: 12/18/2022]
Abstract
The purpose of this review is to demonstrate the critical importance of understanding protein-excipient interactions as a key step in the rational design of formulations to stabilize and deliver protein-based therapeutic drugs and vaccines. Biophysical methods used to examine various molecular interactions between solutes and protein molecules are discussed with an emphasis on applications to pharmaceutical excipients in terms of their effects on protein stability. Key mechanisms of protein-excipient interactions such as electrostatic and cation-pi interactions, preferential hydration, dispersive forces, and hydrogen bonding are presented in the context of different physical states of the formulation such as frozen liquids, solutions, gels, freeze-dried solids and interfacial phenomenon. An overview of the different classes of pharmaceutical excipients used to formulate and stabilize protein therapeutic drugs is also presented along with the rationale for use in different dosage forms including practical pharmaceutical considerations. The utility of high throughput analytical methodologies to examine protein-excipient interactions is presented in terms of expanding formulation design space and accelerating experimental timelines.
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Affiliation(s)
- Tim J Kamerzell
- Cardiovascular Research Institute, University of Kansas Medical Center, Kansas City, KS 66160, USA.
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17
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Mathes J, Friess W. Influence of pH and ionic strength on IgG adsorption to vials. Eur J Pharm Biopharm 2011; 78:239-47. [DOI: 10.1016/j.ejpb.2011.03.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 03/03/2011] [Accepted: 03/14/2011] [Indexed: 11/26/2022]
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Ziemys A, Grattoni A, Fine D, Hussain F, Ferrari M. Confinement effects on monosaccharide transport in nanochannels. J Phys Chem B 2010; 114:11117-26. [PMID: 20738139 DOI: 10.1021/jp103519d] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Transport theories based on the continuum hypothesis may not be appropriate at the nanoscale in view of surface effects. We employed molecular dynamics simulations to study the effects of confinement and concentration on diffusive transport of glucose in silica nanochannels (10 nm or smaller). We found that glucose modifies the electrical properties of nanochannels and that, below 5 nm in channel height, glucose adsorption and diffusivity are significantly reduced. With increasing concentration, the diffusivity is reduced linearly in the bulk, while it is reduced nonlinearly at the interface. The effective diffusivity reduction is related to the interface thickness, which can be 2-4 nm depending on concentration, and has an unexpected reduction at low concentrations. Results suggest that nanochannels present a one-dimensional cage environment that affects diffusivity in a fashion similar to cage-breaking diffusion. Our simulation results, consistent with the experimental observations presented here, suggest that nanoconfinement is the essential cause of the observed altered fluid diffusive transport, not accounted for by classical theories, because of coupling of confinement and concentration effects.
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Affiliation(s)
- A Ziemys
- Department of Nanomedicine and Biomedical Engineering, The University of Texas Health Science Center at Houston, Houston, Texas 77030, USA
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19
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Nayak A, Lee CC, McRae GJ, Belfort G. Osmolyte controlled fibrillation kinetics of insulin: New insight into fibrillation using the preferential exclusion principle. Biotechnol Prog 2010; 25:1508-14. [PMID: 19653270 DOI: 10.1002/btpr.255] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Amyloid proteins are converted from their native-fold to long beta-sheet-rich fibrils in a typical sigmoidal time-dependent protein aggregation curve. This reaction process from monomer or dimer to oligomer to nuclei and then to fibrils is the subject of intense study. The main results of this work are based on the use of a well-studied model amyloid protein, insulin, which has been used in vitro by others. Nine osmolyte molecules, added during the protein aggregation process for the production of amyloid fibrils, slow-down or speed up the process depending on the molecular structure of each osmolyte. Of these, all stabilizing osmolytes (sugars) slow down the aggregation process in the following order: tri > di > monosaccharides, whereas destabilizing osmolytes (urea, guanidium hydrochloride) speed up the aggregation process in a predictable way that fits the trend of all osmolytes. With respect to kinetics, we illustrate, by adapting our earlier reaction model to the insulin system, that the intermediates (trimers, tetramers, pentamers, etc.) are at very low concentrations and that nucleation is orders of magnitude slower than fibril growth. The results are then collated into a cogent explanation using the preferential exclusion and accumulation of osmolytes away from and at the protein surface during nucleation, respectively. Both the heat of solution and the neutral molecular surface area of the osmolytes correlate linearly with two fitting parameters of the kinetic rate model, that is, the lag time and the nucleation rate prior to fibril formation. These kinetic and thermodynamic results support the preferential exclusion model and the existence of oligomers including nuclei and larger structures that could induce toxicity.
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Affiliation(s)
- Arpan Nayak
- Howard P. Isermann Dept. of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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20
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Manning MC, Chou DK, Murphy BM, Payne RW, Katayama DS. Stability of protein pharmaceuticals: an update. Pharm Res 2010; 27:544-75. [PMID: 20143256 DOI: 10.1007/s11095-009-0045-6] [Citation(s) in RCA: 737] [Impact Index Per Article: 52.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Accepted: 12/27/2009] [Indexed: 12/16/2022]
Abstract
In 1989, Manning, Patel, and Borchardt wrote a review of protein stability (Manning et al., Pharm. Res. 6:903-918, 1989), which has been widely referenced ever since. At the time, recombinant protein therapy was still in its infancy. This review summarizes the advances that have been made since then regarding protein stabilization and formulation. In addition to a discussion of the current understanding of chemical and physical instability, sections are included on stabilization in aqueous solution and the dried state, the use of chemical modification and mutagenesis to improve stability, and the interrelationship between chemical and physical instability.
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21
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Guli M, Lambert E, Li M, Mann S. Template-Directed Synthesis of Nanoplasmonic Arrays by Intracrystalline Metalization of Cross-Linked Lysozyme Crystals. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200905070] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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22
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Guli M, Lambert E, Li M, Mann S. Template-Directed Synthesis of Nanoplasmonic Arrays by Intracrystalline Metalization of Cross-Linked Lysozyme Crystals. Angew Chem Int Ed Engl 2009; 49:520-3. [DOI: 10.1002/anie.200905070] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Vessely C, Estey T, Randolph TW, Henderson I, Cooper J, Nayar R, Braun LJ, Carpenter JF. Stability of a trivalent recombinant protein vaccine formulation against botulinum neurotoxin during storage in aqueous solution. J Pharm Sci 2009; 98:2970-93. [PMID: 18680175 DOI: 10.1002/jps.21498] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The adsorption of recombinant botulinum neurotoxin (BoNT) protein-derived vaccine antigens to aluminum salt adjuvants has been previously studied for the development of a trivalent vaccine against the neurotoxins (Vessely et al., in press, J Pharm Sci). The current paper describes an investigation of the stability of recombinant BoNT antigens adsorbed to aluminum salt adjuvants during storage in aqueous solution. Both chemical and physical changes occurred during storage. Phosphate groups in the buffer exchanged with hydroxyl groups on the adjuvant surface. The resulting changes in solution pH and adjuvant surface chemistry promoted more favorable electrostatic interaction between the BoNT proteins and the surface, possibly increasing the affinity of the proteins for the surface during storage. Fluorescence and UV spectroscopy suggested changes to protein structure during storage, whereas differential scanning calorimetry showed changes to thermal processes related to protein conformation and/or surface adsorption. The consequence of the chemical and physical changes to the proteins was a decrease in the ability to desorb protein from the adjuvant surface during storage. Overall, the results of this study emphasize the utility of a thorough characterization of the interactions between protein antigens and aluminum salt adjuvants.
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Affiliation(s)
- Christina Vessely
- Department of Pharmaceutical Sciences. School of Pharmacy, SOP-215, Campus Box C238, University of Colorado Health Sciences Center, Denver, Colorado 80262, USA
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24
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Qi W, Zhang A, Good TA, Fernandez EJ. Two disaccharides and trimethylamine N-oxide affect Abeta aggregation differently, but all attenuate oligomer-induced membrane permeability. Biochemistry 2009; 48:8908-19. [PMID: 19637920 DOI: 10.1021/bi9006397] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Interaction between aggregates of amyloid beta protein (Abeta) and membranes has been hypothesized by many to be a key event in the mechanism of neurotoxicity associated with Alzheimer's disease (AD). Proposed membrane-related mechanisms of neurotoxicity include ion channel formation, membrane disruption, changes in membrane capacitance, and lipid membrane oxidation. Recently, osmolytes such as trehalose have been found to delay Abeta aggregation in vitro and reduce neurotoxicity. However, no direct measurements have separated the effects of osmolytes on Abeta aggregation versus membrane interactions. In this article, we tested the influence of trehalose, sucrose and trimethylamine-N-oxide (TMAO) on Abeta aggregation and fluorescent dye leakage induced by Abeta aggregates from liposomes. In the absence of lipid vesicles, trehalose and sucrose, but not TMAO, were found to delay Abeta aggregation. In contrast, all of the osmolytes significantly attenuated dye leakage. Dissolution of preformed Abeta aggregates was excluded as a possible mechanism of dye leakage attenuation by measurements of Congo red binding as well as hydrogen-deuterium exchange detected by mass spectrometry (HX-MS). However, the accelerated conversion of high order oligomers to fibril caused by vesicles did not take place if any of the three osmolytes presented. Instead, in the case of disaccharide, osmolytes were found to form adducts with Abeta, and change the dissociation dynamics of soluble oligomeric species. Both effects may have contributed to the observed osmolyte attenuation of dye leakage. These results suggest that disaccharides and TMAO may have very different effects on Abeta aggregation because of the different tendencies of the osmolytes to interact with the peptide backbone. However, the effects on Abeta membrane interaction may be due to much more general phenomena associated with osmolyte enhancement of Abeta oligomer stability and/or direct interaction of osmolyte with the membrane surface.
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Affiliation(s)
- Wei Qi
- Department of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
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25
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26
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Dong J, Hubel A, Bischof JC, Aksan A. Freezing-Induced Phase Separation and Spatial Microheterogeneity in Protein Solutions. J Phys Chem B 2009; 113:10081-7. [DOI: 10.1021/jp809710d] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jinping Dong
- Characterization Facility, Institute of Technology, University of Minnesota, Minneapolis, Minnesota 55455, and Mechanical Engineering Department, 111 Church Street Southeast, University of Minnesota, Minneapolis, Minnesota 55455
| | - Allison Hubel
- Characterization Facility, Institute of Technology, University of Minnesota, Minneapolis, Minnesota 55455, and Mechanical Engineering Department, 111 Church Street Southeast, University of Minnesota, Minneapolis, Minnesota 55455
| | - John C. Bischof
- Characterization Facility, Institute of Technology, University of Minnesota, Minneapolis, Minnesota 55455, and Mechanical Engineering Department, 111 Church Street Southeast, University of Minnesota, Minneapolis, Minnesota 55455
| | - Alptekin Aksan
- Characterization Facility, Institute of Technology, University of Minnesota, Minneapolis, Minnesota 55455, and Mechanical Engineering Department, 111 Church Street Southeast, University of Minnesota, Minneapolis, Minnesota 55455
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Abstract
The major challenges in formulation development for hydrophobic proteins are low solubility often combined with a strong tendency for adsorption. Human serum albumin (HSA) is frequently used as excipient to overcome these problems. Due to several drawbacks with HSA, new ways need to be found to circumvent the use of this excipient in protein formulations. One possible approach is to select an appropriate formulation pH and ionic strength in combination with excipients that provide sufficient stability and solubility for the hydrophobic protein. A reduction in adsorption can be achieved by adding surfactants or using special containers.
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Affiliation(s)
- Andrea Hawe
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University of Munich, Munich, Germany.
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28
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Foose LL, Blanch HW, Radke CJ. Kinetics of adsorption and proteolytic cleavage of a multilayer ovalbumin film by subtilisin Carlsberg. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:7388-7393. [PMID: 18564867 DOI: 10.1021/la8007014] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Adsorption and proteolytic activity of the enzyme subtilisin Carlsberg have been studied on an immobilized, multilayer ovalbumin film. The cross-linked multilayer substrate permits protease adsorption to be examined unencumbered by the surface inhomogeneity typically observed in monolayer studies of protease surface kinetics. Decline of the protein film was measured over time using ellipsometry. Resulting kinetic data as a function of aqueous enzyme concentration and temperature were well fit by a Langmuir-Michaelis-Menten model for surface proteolysis. We observed that both the protein degradation kinetics and the in situ adsorption data were well described by the proposed model. The temperature dependence of the kinetic rate parameter yielded an activation energy of 12 kcal/mol. Further, the apparent Langmuir adsorption equilibrium constant of the enzyme at the protein/aqueous interface was 0.11 L/mg at 22 degrees C, 0.034 L/mg at 36 degrees C, and 0.011 L/mg at 50 degrees C. Although enzyme adsorption at a given aqueous enzyme concentration decreased at higher temperature, the enzyme cleaved the substrate more rapidly, leading to a net increase in the ovalbumin film degradation rate. We observed that the maximum enzyme coverage on the immobilized protein surface was approximately 40% of a close-packed monolayer at ambient temperature (22 degrees C).
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Affiliation(s)
- Ladan L Foose
- Department of Chemical Engineering, University of California, Berkeley, California 94720, USA
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29
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Kumar R, Wyman CE. An improved method to directly estimate cellulase adsorption on biomass solids. Enzyme Microb Technol 2008. [DOI: 10.1016/j.enzmictec.2007.12.005] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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30
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Adams DR, Toner M, Langer R. Role of trehalose in prevention of giant vesicle adsorption and encapsulated solute leakage in anhydrobiotic preservation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:13013-13023. [PMID: 17983248 DOI: 10.1021/la700452k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Anhydrobiotic preservation has the potential to allow the processing and storage of mammalian cells in a state of suspended animation at ambient conditions in trehalose glasses; however, stresses--particularly to the lipid bilayer--during desiccation and rehydration have thus far prevented the full realization of the promise of this technique. Giant gel-phase 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC) and liquid-crystalline-phase 1,2-dilauroyl-sn-glycero-3-phosphocholine (DLPC) vesicles provide a model cell system with which to elucidate the role of trehalose in surface-lipid bilayer interactions, as well as the part played by lipid phase. In the absence of trehalose, DSPC liposomes adsorbed to polystyrene, producing irreversible structural changes and apparent leakage of all intravesicular solute upon drying and rehydration. Addition of trehalose significantly reduced vesicle adsorption with only transient intravesicular solute leakage for the rehydrated vesicles; however, at very low moisture contents, the vesicles underwent permanent structural changes. In contrast to the results with DSPC vesicles, DLPC vesicles largely avoided adsorption and exhibited high intravesicular solute retention when dried and rehydrated even in the absence of trehalose, despite significant internal structural changes.
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Affiliation(s)
- Dana R Adams
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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31
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Abstract
Biopreservation processes such as freezing and drying inherently introduce heterogeneity. We focused on exploring the mechanisms responsible for heterogeneity in isothermal, diffusively dried biopreservation solutions that contain a model protein. The biopreservation solutions used contained trehalose (a sugar known for its stabilization effect) and salts (LiCl, NaCl, MgCl2, and CaCl2). Performing Fourier transform infrared spectroscopy analysis on the desiccated droplets, spatial distributions of the components within the dried droplet, as well as their specific interactions, were investigated. It was established that the formation of multiple thermodynamic states was induced by the spatial variations in the cosolute concentration gradients, directly affecting the final structure of the preserved protein. The spatial distribution gradients were formed by two competing flows that formed within the drying droplet: a dominant peripheral flow, induced by contact line pinning, and the Marangoni flow, induced by surface tension gradients. It was found that the changes in cosolute concentrations and drying conditions affected the spatial heterogeneity and stability of the product. It was also found that trehalose and salts had a synergistic stabilizing effect on the protein structure, which originated from destructuring of the vicinal water, which in turn mediated the interactions of trehalose with the protein. This interaction was observed by the change in the glycosidic CO, and the CH stretch vibrations of the trehalose molecule.
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32
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Hawe A, Friess W. Development of HSA-free formulations for a hydrophobic cytokine with improved stability. Eur J Pharm Biopharm 2007; 68:169-82. [PMID: 17574398 DOI: 10.1016/j.ejpb.2007.04.018] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2007] [Revised: 04/26/2007] [Accepted: 04/26/2007] [Indexed: 10/23/2022]
Abstract
The goal was to characterize a hydrophobic cytokine with respect to oxidation and aggregation, as well as its adsorption to the container at different pH and ionic strength conditions. The tendency of the cytokine to adsorb on surfaces and its low solubility at physiological pH were the main challenges during the development of HSA-free formulations for the cytokine. When the formulation pH exceeded 5.5 precipitation led to significantly higher turbidity. This turbidity increase and elevated aggregation as determined by HP-SEC and DLS was more pronounced at higher glycine and NaCl concentrations. With rising pH protein adsorption was more distinct compared to pH 3.0. However, protein adsorption could be minimized by polysorbate 20 or the use of glass type I(+). FTIR revealed a reduced thermal stability at higher pH values indicated by a declining denaturation temperature. Five liquid formulations in the pH range 3.5-4.5 and five lyophilized formulations at pH 4.0-5.0 were stored for 6 months and the stability was evaluated with respect to aggregation and chemical modification. Liquid formulations at pH 3.5-4.0 and lyophilized formulations at pH 4.0-5.0 were most stable during 6 months at 2-8 degrees C.
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Affiliation(s)
- Andrea Hawe
- Ludwig-Maximilians-University Munich, Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Munich, Germany.
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33
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Davis JP, Foegeding EA. Comparisons of the foaming and interfacial properties of whey protein isolate and egg white proteins. Colloids Surf B Biointerfaces 2007; 54:200-10. [PMID: 17123793 DOI: 10.1016/j.colsurfb.2006.10.017] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2005] [Revised: 09/15/2006] [Accepted: 10/16/2006] [Indexed: 11/28/2022]
Abstract
Whipped foams (10%, w/v protein, pH 7.0) were prepared from commercially available samples of whey protein isolate (WPI) and egg white protein (EWP), and subsequently compared based on yield stress (tau(0)), overrun and drainage stability. Adsorption rates and interfacial rheological measurements at a model air/water interface were quantified via pendant drop tensiometry to better understand foaming differences among the ingredients. The highest tau(0) and resistance to drainage were observed for standard EWP, followed by EWP with added 0.1% (w/w) sodium lauryl sulfate, and then WPI. Addition of 25% (w/w) sucrose increased tau(0) and drainage resistance of the EWP-based ingredients, whereas it decreased tau(0) of WPI foams and minimally affected their drainage rates. These differing sugar effects were reflected in the interfacial rheological measurements, as sucrose addition increased the dilatational elasticity for both EWP-based ingredients, while decreasing this parameter for WPI. Previously observed relationships between tau(0) and interfacial rheology did not hold across the protein types; however, these measurements did effectively differentiate foaming behaviors within EWP-based ingredients and within WPI. Interfacial data was also collected for purified beta-lactoglobulin (beta-lg) and ovalbumin, the primary proteins of WPI and EWP, respectively. The addition of 25% (w/w) sucrose increased the dilatational elasticity for adsorbed layers of beta-lg, while minimally affecting the interfacial rheology of adsorbed ovalbumin, in contrast to the response of WPI and EWP ingredients. These experiments underscore the importance of utilizing the same materials for interfacial measurements as used for foaming experiments, if one is to properly infer interfacial information/mechanisms and relate this information to bulk foaming measurements. The effects of protein concentration and measurement time on interfacial rheology were also considered as they relate to bulk foam properties. This data should be of practical assistance to those designing aerated food products, as it has not been previously reported that sucrose addition improves the foaming characteristics of EWP-based ingredients while negatively affecting the foaming behavior of WPI, as these types of protein isolates are common to the food industry.
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Affiliation(s)
- J P Davis
- Department of Food Science, North Carolina State University, Raleigh, NC 27695-7624, USA
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34
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Vutukuru S, Bethi SR, Kane RS. Protein interactions with self-assembled monolayers presenting multimodal ligands: a surface plasmon resonance study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:10152-6. [PMID: 17107014 DOI: 10.1021/la062093p] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
This paper describes the use of surface plasmon resonance (SPR) spectroscopy and self-assembled monolayers (SAMs) to understand the characteristics of surfaces that promote the adsorption of proteins at high ionic strengths (high-salt conditions). We synthesized SAMs presenting different multimodal ligands and determined the influence of surface composition, solution composition, and the nature of the protein on the extent of protein adsorption onto the SAMs. Our results confirm that hydrophobic interactions can contribute significantly to protein adsorption under high-salt conditions. In particular, the extent of protein adsorption under high-salt conditions increased with increasing surface hydrophobicity. The extent of protein adsorption was also influenced by the solution composition and decreased with an increase in the chaotropicity of the anion. The combination of SPR and SAMs is well-suited for studying the interaction of proteins with complex surfaces of relevance to chromatography.
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Affiliation(s)
- Srinavya Vutukuru
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
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35
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Karlsson M, Ekeroth J, Elwing H, Carlsson U. Reduction of Irreversible Protein Adsorption on Solid Surfaces by ProteinEngineering for IncreasedStability. J Biol Chem 2005; 280:25558-64. [PMID: 15857836 DOI: 10.1074/jbc.m503665200] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The influence of protein stability on the adsorption and desorption behavior to surfaces with fundamentally different properties (negatively charged, positively charged, hydrophilic, and hydrophobic) was examined by surface plasmon resonance measurements. Three engineered variants of human carbonic anhydrase II were used that have unchanged surface properties but large differences in stability. The orientation and conformational state of the adsorbed protein could be elucidated by taking all of the following properties of the protein variants into account: stability, unfolding, adsorption, and desorption behavior. Regardless of the nature of the surface, there were correlation between (i) the protein stability and kinetics of adsorption, with an increased amplitude of the first kinetic phase of adsorption with increasing stability; (ii) the protein stability and the extent of maximally adsorbed protein to the actual surface, with an increased amount of adsorbed protein with increasing stability; (iii) the protein stability and the amount of protein desorbed upon washing with buffer, with an increased elutability of the adsorbed protein with increased stability. All of the above correlations could be explained by the rate of denaturation and the conformational state of the adsorbed protein. In conclusion, protein engineering for increased stability can be used as a strategy to decrease irreversible adsorption on surfaces at a liquid-solid interface.
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Affiliation(s)
- Martin Karlsson
- IFM-Department of Chemistry, Linköping University, SE-581 83 Linköping, Sweden
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