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  • Title: Preparation of a reference material containing sterigmatocystin.
    Author: Tanaka K, Sagou Y, Nakagawa H, Naito S, Kushiro M.
    Journal: Food Addit Contam Part A Chem Anal Control Expo Risk Assess; 2008 Sep; 25(9):1141-6. PubMed ID: 18798039.
    Abstract:
    To assure the homogeneity of a reference material for the mycotoxin sterigmatocystin (STE), a study was first conducted to prepare a reference material of rice containing the colouring Food Red 106. The protocol developed was then used to prepare a reference material of rice containing STE. Initially, a V-shaped mixer was used to mix Food Red 106 and ground brown rice, but the resulting mixture was non-homogeneous. However, when a ShakeMaster was used for the simultaneous grinding and mixing of brown rice with Food Red 106, good homogeneity was obtained. Accordingly, a dried culture of Aspergillus versicolor NRRL5219 and brown rice was ground and mixed with the ShakeMaster. To assess the distribution of the STE an Autoprep MF-A 1000 mini-column was used to isolate the STE, and a 115-120% recovery rate was obtained. Repeatability (variability within a day) and intermediate precision (variability between days) were good. According to the IUPAC/ISO/AOAC International Harmonized Protocol for the Proficiency Testing of Analytical Chemistry Laboratories, a homogeneous candidate reference material was obtained. The particle sizes of ground brown rice, ground brown rice containing Food Red 106, and ground brown rice containing a non-STE producing culture of A. oryzae were analysed and they ranged from 10 to 700 microm.
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