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SMECTITE CLAY ADSORPTION OF AFLATOXIN vs. OCTAHEDRAL COMPOSITION AS INDICATED BY FTIR

Soil and Crop Sciences Department, Texas A&M University, College Station, TX 77843, USA

^* E-mail address of corresponding author: j-dixon{at}tamu.edu

The fungus Aspergillus flavus Link ex Fries can infect grains and oil seeds and develop Aflatoxin B₁ (AfB₁) in the field or in storage. Aflatoxin contamination is a serious health hazard – it is extremely toxic and hepatocarcinogenic for animals and humans. A practical approach to solve this problem is to use smectite clay as an amendment to animal feed. The objective of this research is to investigate smectite clay–AfB₁ interactions by employing Fourier transform infrared (FTIR) spectroscopy to determine how clay composition influences AfB₁ adsorption by smectites. When AfB₁ was present in the clay, the spectral region from 1800 to 1300 cm^–1 was altered, and the regions between 4000 and 1800 and 1300 and 400 cm^–1 were unchanged except for the intensity in the broad region near 3400 cm^–1 related to the abundance of water. The 1300–400 cm^–1 region is attributed only to smectite clay properties, and it relates to the relative adsorption potential of the different smectites. Bonding between AfB₁ and smectite clay appears to be in the furan rings. Other possible bonding is with the two oxygens in the coumarin ring of AfB₁ and interlayer cations or their associated water molecules. The FTIR evidence of octahedral Fe in smectite and amorphous silica in the clays both indicate greater AfB₁ adsorption potential. Other smectites with spectral absorption indicating predominantly Al in the octahedral positions adsorbed less AfB₁.

Key Words: Aflatoxin • Adsorption Capacity • Cancer Prevention • FTIR • Smectite Clay

This article has been cited by other articles:

				I. Mulder, A. L. Barrientos Velazquez, M. G. Tenorio Arvide, G. N. White, and J. B. Dixon SMECTITE CLAY SEQUESTRATION OF AFLATOXIN B1: PARTICLE SIZE AND MORPHOLOGY Clays and Clay Minerals, October 1, 2008; 56(5): 558 - 570. [Abstract] [Full Text] [PDF]