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Detection of Artichoke Latent Virus by an Indirect Dot‐ELISA
Author(s) -
Cugusi M.,
Foddai A.,
Idini G.
Publication year - 1991
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1991.tb00121.x
Subject(s) - nitrocellulose , virus , biology , dilution , virology , conjugate , alkaline phosphatase , membrane , chromatography , enzyme , chemistry , biochemistry , thermodynamics , mathematical analysis , physics , mathematics
An indirect Dot‐ELISA was compared with DAS‐ELISA for detecting Artichoke Latent Virus (ALV) both in purified preparations and in crude sap from “Spinoso sardo” artichoke leaves. Antigen diluted samples (1 μl) were first spotted on nitrocellulose (NC) and polyvinylidene difluoride (PVDF) membranes. After blocking, the membranes were incubated in rabbit anti‐ALV IgG, then in goat anti‐rabbit IgG—alkaline phosphatase conjugate, and finally exposed to substrate and examined for a coloured precipitate. The minimum detection levels for ALV by Dot‐ELISA were 125 pg of purified virus and 1/2,000 dilution of virus‐infected sap on NC, and 83.3 pg of purified virus and 1/4,000 dilution of virus‐infected sap on PVDF, as compared with 50 ng of purified virus and 1/1,000 dilution of virus‐infected sap detectable by DAS‐ELISA. This indirect Dot‐ELISA proved to be more sensitive and more economical than DAS‐ELISA, and can be completed in as little as 5—6 hours.