Abstract:
:The distribution of alpha-casein, bovine serum albumin (BSA), myoglobin and recombinant protective antigen (rPA) in mono-valent and combination vaccines containing aluminum hydroxide adjuvant was studied by fluorescence microscopy and flow cytometry. Green and red fluorescent probes were conjugated to the antigens. Adsorption isotherms of the fluorescently labeled proteins to aluminum hydroxide adjuvant demonstrated that incorporation of the fluorescent probe did not significantly affect the adsorption. In mono-valent vaccine systems, antigen adsorption occurred within one minute and uniform surface coverage of the adjuvant aggregates was observed within 1h. Content uniformity was achieved through a cycle of de-aggregation and re-aggregation of the aluminum hydroxide adjuvant aggregates caused by mixing. For combination vaccines, two antigens were adsorbed separately to the aluminum hydroxide adjuvant prior to combination. Following combination, cycles of de-aggregation and re-aggregation occurred due to mixing, which led to uniform distribution of both antigens. The results of this study indicate that content uniformity should not be an issue during the production of mono-valent or combination vaccines as long as adequate mixing procedures are followed.
journal_name
Vaccinejournal_title
Vaccineauthors
Morefield GL,HogenEsch H,Robinson JP,Hem SLdoi
10.1016/j.vaccine.2003.10.040subject
Has Abstractpub_date
2004-05-07 00:00:00pages
1973-84issue
15-16eissn
0264-410Xissn
1873-2518pii
S0264410X03008107journal_volume
22pub_type
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