title: Determination of 30 elements in colorectal biopsies by sector field inductively coupled plasma mass spectrometry: method development and preliminary baseline levels.
abstract: An analytical procedure applicable to restricted sample sizes was developed and applied to the analysis of 30 chemical elements in colorectal biopsies of healthy patients. Acidic microwave digestion processed </=10 mg of tissue at 80 degrees C in 15-mL polystyrene liners. The digests were diluted to a volume of 2 mL with high-purity water and directly analyzed by sector field inductively coupled plasma mass spectrometry without further specimen handling. A careful selection of isotopes and instrumental resolution permitted the quantification in a single analytical sequence both of the elements present at parts per trillion and of those at parts per million. The accuracy calculated on BCR 184 ranged from 93.3-110%, the recoveries of the biopsy material was in the range 95.2-105%, the precision was <10%, and the blank levels were much below those expected in biopsy samples. The metal concentrations (on a dry-weight basis) in colorectal normal tissue showed a large range of variation: Ag, Au, Be, Bi, Co, Li, Sb, Tl, V, W and Zr were below 50 ng g(-1); As, Ba, Cd, Cr, Cs, Hg, Mo, Ni, Pb, Se and Sn were distributed from 100 to 500 ng g(-1); Al, Cu, Fe, Mn, Sr and Zn were from a few microg g(-1) to 100 microg g(-1); and Ca and Mg were at a level of 1000 microg g(-1). These data represent the first attempt to achieve an elemental profile in the colorectal mucosa of healthy patients as baseline level measurements for studies focused on the imbalance of chemical elements in diseased mucosa.
authors.affiliation: Istituto Superiore di Sanità, Department of Environment and Primary Prevention, Viale Regina Elena 299, 00161 Rome, Italy.
authors.forename: Beatrice
authors.initials: B
authors.lastname: Bocca
authors.forename: Antonella
authors.initials: A
authors.lastname: Lamazza
authors.forename: Anna
authors.initials: A
authors.lastname: Pino
authors.forename: Ercole
authors.initials: E
authors.lastname: De Masi
authors.forename: Maura
authors.initials: M
authors.lastname: Iacomino
authors.forename: Daniela
authors.initials: D
authors.lastname: Mattei
authors.forename: Siavash
authors.initials: S
authors.lastname: Rahimi
authors.forename: Enrico
authors.initials: E
authors.lastname: Fiori
authors.forename: Alberto
authors.initials: A
authors.lastname: Schillaci
authors.forename: Alessandro
authors.initials: A
authors.lastname: Alimonti
authors.forename: Giovanni
authors.initials: G
authors.lastname: Forte
mesh_terms: D000368:Aged; D001706:Biopsy; D003106:Colon / Q000737:chemistry*; D003110:Colonic Neoplasms / Q000737:chemistry; D003111:Colonic Polyps / Q000737:chemistry; D004602:Elements; D005260:Female; D006801:Humans; D007202:Indicators and Reagents; D007413:Intestinal Mucosa / Q000737:chemistry; D008297:Male; D013058:Mass Spectrometry; D008875:Middle Aged; D008970:Molecular Weight; D012004:Rectal Neoplasms / Q000737:chemistry; D012007:Rectum / Q000737:chemistry*; D012016:Reference Values
chemical_list: D004602:Elements; D007202:Indicators and Reagents