At present the best technology is the LCMSMS instrument, with this more than hundred different fumonisin isomers belonging to different groups FB1-FB6, and several more). The FB1 is the most important one, but as you see the FB1/FB4 complex, FB1 has not more than about 50 % rate as average, and when you consider all the more than hundred different fumonisins from one sample, FB1 can go down to 30 %. Its rate differs according to isolates (chemotypes), hybrids and environment. Therefore the fumonisin problem is far more complex than the FB1 problem is. Additionally we know that the different fumonisins may differ in toxicity, therefore the toxicity should be expressed as FB1 unit expressing the toxicity to FB1 and then summarize them. To the topics see Bartók et al from 2006.