Campus Access Only

All rights reserved. This publication is intended for use solely by faculty, students, and staff of University of the Pacific. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, now known or later developed, including but not limited to photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author or the publisher.

Date of Award


Document Type

Thesis - Pacific Access Restricted

Degree Name

Master of Science (M.S.)


Pharmaceutical and Chemical Sciences

First Advisor

Xin Guo

First Committee Member

Xiaoling Li

Second Committee Member

John Livesey


Protein therapeutics have great potential in treating human disease, especially for those caused by alternations in the functions of intracellular proteins. However, clinical use of protein by intracellular delivery has been hampered by the instability due to proteins' physicochemical properties, and some barriers in the delivery pathway. This study was to prepare and test a novel intracellular protein delivery system - magnesium phosphate nanoparticles with cationic lipid coating for catalase intracellular delivery (LP MgP NP-CAT), and investigate whether it can release the encapsulated catalase to cytosol. LP MgP NP-CAT was designed, prepared and characterized, showing that it had an average diameter around 300 nm and zeta potential around +40mV. The pH - triggered catalase release from LP MgP NP-CAT was determined by a hydrogen peroxide degradation assay, where the concentration of remaining hydrogen peroxide was measured by UV-Vis spectroscopy, indicating catalase was released in response to the drop of pH, which was confirmed by the morphology change of LP MgP NP-CAT observed by transmission electron microscopy. The in vitro catalase release behavior was conducted on MCF-7 cells and EA.hy926 cells. LP MgP NP-CAT was delivered into MCF-7 cells and the release behavior was determined by the resultant resistance of the cells against hydrogen peroxide using MTS cell viability assay. The delivery of LP MgP NP-CAT into EA.hy926 cells was determined by the decrease of the reactive oxygen species level. Both of the studies showed that catalase was successfully delivered and released which is supported by the reduction of hydrogen peroxide.





To access this thesis/dissertation you must have a valid email address and log-in to Scholarly Commons.

Find in ProQuest



If you are the author and would like to grant permission to make your work openly accessible, please email


Rights Statement

Rights Statement

In Copyright. URI:
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).