ABO reverse grouping: effect of varying concentrations of the enzyme bromelain

Rookard, L.E., Edmondson, O. and Greenwell, Pamela (2009) ABO reverse grouping: effect of varying concentrations of the enzyme bromelain. British Journal of Biomedical Science, 66 (2). pp. 93-97. ISSN 0967-4845

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Proteolytic enzymes can be extremely useful for the identification of clinically significant antibodies in blood grouping; however, they can also be destructive to certain agglutination reactions. ABO antibodies are the most clinically significant. A review of the literature reveals little research involving proteolytic enzymes and IgM antibodies. This study investigates the effects of various concentrations of the proteolytic enzyme bromelain on the agglutination of reagent A1 and B cells with donor plasma during ABO reverse grouping on the Olympus PK 7300 automated serology analyser. The optimum bromelain concentration improved or enhanced antigen-antibody reactions, causing a reduction in ABO failures. The results were analysed using an ANOVA test. An anomalous result was obtained at 0% bromelain where less ABO failures were generated than expected. Although most results were not statistically significant, the optimum bromelain concentration for ABO reverse grouping indicated was 0.25%. This work also highlighted the fact that ABO failures can be attributed to other factors such as sensitivity of reagent cells and antibody avidity. This study identified limitations and problems with the methods used and presents recommendations for future research which may assist in the clarification of the role of proteolytic enzymes in ABO reverse grouping.

Item Type: Article
Subjects: University of Westminster > Science and Technology > Life Sciences, School of (No longer in use)
Depositing User: Miss Nina Watts
Date Deposited: 14 Apr 2011 11:03
Last Modified: 14 Apr 2011 11:03
URI: http://westminsterresearch.wmin.ac.uk/id/eprint/9313

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