title: Standardization and validation of a new atomic absorption spectroscopy technique for determination and quantitation of aluminium adjuvant in immunobiologicals.
abstract: In the present study, Aluminium quantification in immunobiologicals has been described using atomic absorption spectroscopy (AAS) technique. The assay was found to be linear in 25-125 microg/ml Aluminium range. The procedure was found to be accurate for different vaccines with recoveries of external additions ranging between 93.26 and 103.41%. The mean Limit of Variation (L.V.) for both intra- and inter-assay precision was calculated to be 1.62 and 2.22%, respectively. Further the procedure was found to be robust in relation to digestion temperature, alteration in acid (HNO(3) and H(2)SO(4)) ratio used for sample digestion and storage of digested vaccine samples up to a period of 15 days. After validation, AAS method was compared for its equivalency with routinely used complexometric titration method. On simultaneously applying on seven different groups of both bacterial and viral vaccines, viz., DPT, DT, TT, Hepatitis-A and B, Antirabies vaccine (cell culture) and tetravalent DPT-Hib, a high degree of positive correlation (+0.85-0.998) among AAS and titration methods was observed. Further AAS method was found to have an edge over complexometric titration method that a group of vaccines, viz., ARV (cell culture, adsorbed) and Hepatitis-A, in which Aluminium estimation is not feasible by pharmacopoeial approved complexometric titration method (possibly due to some interference in the sample matrix), this newly described and validated AAS assay procedure delivered accurate and reproducible results.
authors.affiliation: Biochemistry Division, Central Research Institute, Kasauli, District Solan, Himachal Pradesh, India.
authors.forename: Arti
authors.initials: A
authors.lastname: Mishra
authors.forename: Sumir Rai
authors.initials: SR
authors.lastname: Bhalla
authors.forename: Sameera
authors.initials: S
authors.lastname: Rawat
authors.forename: Vivek
authors.initials: V
authors.lastname: Bansal
authors.forename: Rakesh
authors.initials: R
authors.lastname: Sehgal
authors.forename: Sunil
authors.initials: S
authors.lastname: Kumar
mesh_terms: D000276:Adjuvants, Immunologic / Q000032:analysis* / Q000592:standards; D000535:Aluminum / Q000032:analysis* / Q000276:immunology / Q000592:standards; D001428:Bacterial Vaccines / Q000737:chemistry; D012015:Reference Standards; D012680:Sensitivity and Specificity; D013054:Spectrophotometry, Atomic / Q000379:methods* / Q000592:standards / Q000706:statistics & numerical data; D014765:Viral Vaccines / Q000737:chemistry
chemical_list: D000276:Adjuvants, Immunologic; D001428:Bacterial Vaccines; D014765:Viral Vaccines; D000535:Aluminum