UMI  
ProQuest® Dissertations & Theses
The world's most comprehensive collection of dissertations and theses. Learn more...
ProQuest  
 
 
The organic solubilization of viruses and hemoglobin: Development of new formulations for thermally stable vaccine analogues
by Johnson, Harvey Ryan, PhD, UNIVERSITY OF CALIFORNIA, BERKELEY, 2006, 0 pages; 3253910
 

Abstract: Three organic solubilization techniques were developed for a vaccine analogue, bacteriophage MS2: dry solubilization (DS), reverse micelle solubilization (RM) and 'azeodried' solubilization (AZ). The surfactant Aerosol OT (AOT) was used in each case to solubilize the naked virus in organic solvent. For each solubilization technique, the amount of AOT and isooctane remained the same, while the amount of water solubilized in each formulation varied. The solubilization efficiency of each formulation was compared: DS (5%), RM (67%) and AZ (47%). The viability of the solubilized samples were tested and found to contain virus that could replicate. Further, the RM and AZ formulations of MS2 were found to be stable after heating to 90°C for twenty minutes while DS, aqueous and N2-dried samples of MS2 were not. The utility of MS2 solubilization in organic solvent was demonstrated through a bioconjugation that was impossible to perform in aqueous solution. In order to show the compatibility of the solubilization techniques with other biological substrates, hemoglobin was solubilized using a similar procedure. Hemoglobin, an important blood protein of commercial interest, allowed for the facile determination of thermal or solvent induced unfolding by loss of the absorbance of the bound heme in the active site of the protein. The protein was found to resist heat treatment at 90°C for twenty minutes in a polystyrene matrix. Organic solvent solubilization alone increased the melt temperature of the protein from 43°C (for aqueous buffer) to 76°C (AZ in isooctane), as measured by dynamic light scattering. Tobacco mosaic virus (TMV) is a rod-shaped virus, 17 ran in diameter and 300 nm in length. TMV is an important target as a scaffold for nanometer-scaled advanced materials such as a synthetic light harvesting system. The solubilization of the relatively large TMV demonstrated that the solubilization procedure could be generalized to other viruses. Dynamic light scattering was employed to measure the effective diameter of the solubilized species. The virus was found to be two orders of magnitude larger than the protein-free reverse micelle system alone, suggesting that the virus was aggregated in the organic solvent. However, the presence of a non-zero rotational diffusion coefficient suggested that the solution of solubilized virus aggregates contains rod-like scattering moieties.

 
Advisor: Clark, Douglas S.; Francis, Matthew B.
School: UNIVERSITY OF CALIFORNIA, BERKELEY
Source: DAI-B 68/02, p. 1134, Aug 2007
Source Type: PhD
Subjects: Chemical engineering
Publication Number: 3253910
     
Adobe PDF Access the complete dissertation:
 

» Find an electronic copy at your library.
  Use the link below to access a full citation record of this graduate work:
  http://gateway.proquest.com/openurl%3furl_ver=Z39.88-2004%26res_dat=xri:pqdiss%26rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation%26rft_dat=xri:pqdiss:3253910
  If your library subscribes to the ProQuest Dissertations & Theses (PQDT) database, you may be entitled to a free electronic version of this graduate work. If not, you will have the option to purchase one, and access a 24 page preview for free (if available).

 
 
 

About ProQuest Dissertations & Theses
With over 2.3 million records, the ProQuest Dissertations & Theses (PQDT) database is the most comprehensive collection of dissertations and theses in the world. It is the database of record for graduate research.

The database includes citations of graduate works ranging from the first U.S. dissertation, accepted in 1861, to those accepted as recently as last semester. Of the 2.3 million graduate works included in the database, ProQuest offers more than 1.9 million in full text formats. Of those, over 860,000 are available in PDF format. More than 60,000 dissertations and theses are added to the database each year.

If you have questions, please feel free to visit the ProQuest Web site - http://www.il.proquest.com - or call ProQuest Hotline Customer Support at 1-800-521-3042.



Copyright © 2007 ProQuest. All rights reserved. Terms and Conditions

ProQuest