Abstract
The agar gel double diffusion test was evaluated for detection of nuclear polyhedrosis virus infecting the silkworm, Bombyx mori L. (BmNPV). The test was successful using alkali-dissolved BmNPV as antigen. The antiserum raised against dissolved BmNPV gave positive results with a wider range of antigenic concentrations compared to antiserum raised against undissolved BmNPV. Gel plates prepared using phosphate buffered-saline as dissolving medium for agarose gave sharper and clearer precipitation bands compared to those made with sodium carbonate-saline as diluent. Sharp bands were obtained when the experiment was carried out at 25°C, whereas at higher temperature (35°C), the bands were diffused. The test was able to detect antigen concentration as low as 2 × 106 OBs/ml (18.9 μg/ml of antigen protein).
Résumé
Le test de double diffusion en gel d’agar a été évalué pour la détection du virus à polyhédrose nucléaire infectant le ver à soie, Bombyx mori L. (BmNPV). Le test a réussi en utilisant le BmNPV en solution basique comme antigène. L’antisérum produit centre le BmNPV dissous a donné des résultats positifs avec une plus large gamme de concentrations antigéniques par rapport à l’antisérum produit par le BmNPV non dissous. Les plaques de gel préparées en utilisant une solution saline en tempon phosphate comme milieu dissolvent pour l’agarose a donné des bandes de précipitation plus nettes et plus claires par rapport à celles produites avec le sel de phosphate de sodium comme diluant. De bandes nettes étaient obtenues quand l’expérience se déroulait à 25°C, alors qu’à plus haute température (35°C), les bandes étaient diffuses. Le test pouvait détecter l’antigène jusqu’à une concentration aussi basse que 2 × 106 OBs/ml (18.9 μg/ml de protéine antigénique).
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Bhattacharya, J., Krishnan, N., Chandra, A.K. et al. Evaluation of Agar Gel Double Diffusion Test for Detection of Nuclear Polyhedrosis Virus of Silkworm, Bombyx mori L.. Int J Trop Insect Sci 16, 351–356 (1995). https://doi.org/10.1017/S1742758400017392
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DOI: https://doi.org/10.1017/S1742758400017392