6 th EC Forum on Fusarium toxins. Brussels, February, 2009
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1 6 th EC Forum on Fusarium toxins. Brussels, February, 2009 T-2, HT-2 and deoxynivalenol (DON) in malting barley and malt Ian Slaiding
2 Outline of presentation What is Euromalt Summary of evidence presented to 5 th Fusarium Forum Data from the 2008 barley harvest Occurrence of T-2 and HT-2 toxins in malting barley Changes in incidence T-2 and HT-2 toxins in commercial malts Studies on loss of T-2 and HT-2 during malting of barley
3 Euromalt Euromalt was established in 1959 and represents the interests of the EU malting industry Around 8.8 million tonnes of malt (42% of the world total) are produced annually in the EU Around one quarter of this is exported 94% of total malt production is used for beer brewing 4% is used for whisky distilling 2% is used in the food industry
4 Summary of data presented at 5 th Fusarium Forum Occurrence and concentrations of T-2 and HT-2 toxins in barley appear to be increasing across Europe Occurrence of toxins appears to be related to an increase in the incidence of F langsethiae Data from France suggest that levels in Winter barley may be lower than in Spring barleys Pilot malting studies suggest that T-2 and HT-2 can be leached out of barley during steeping Levels of T-2 and HT-2 in malt are almost always lower than in barley However, the relationship between levels in malt and those in barley is not constant
5 Euromalt has been surveying mycotoxins Euromalt has been surveying mycotoxins in European malting barleys and malts since 2002
6 Euromalt mycotoxin survey samples per year in total, from all EU member states with significant malt production Number of samples per country is proportional to malt production 10kg samples are collected and analysed according to EU protocol (Regulation EC No. 401/2006) Samples are collected as pairs: a barley sample and the malt produced from that barley Samples analysed for a wide range of Fusarium toxins by validated GC-MS or LC-MS/MS methods
7 Incidence of trichothecenes in barley Incidence (% samples > LOD) Harvest year DON (15) HT-2 (2) T-2 (1) T-2 Triol (2) 80 to 95 samples per year
8 Incidence: Effect of limit of detection LODs have not changed significantly since 2004 year-on-year changes in apparent incidence therefore not due to lower limits of detection some differences between LODs for different trichothecenes LOD of T-2 is lower than HT-2: likely to explain apparent higher incidence of T-2 LOD for DON is high compared with other LODs: true incidence of DON is almost certainly higher
9 Correlation between T-2 + HT-2 and DON in barley DON in barley (µ µg/kg) R 2 = T2+HT2 in barley (µg/kg) 95 samples from the 2008 harvest
10 Incidence: summary of results Incidence of both T-2 and HT-2 in barley appears to have stabilised at about 80% of harvest samples Trends for T-2 and HT-2 are different from that of the related trichothecene DON Incidence of DON higher in 2007 and 2008 which were generally wet seasons HT-2 and T-2 stable after 2006: no increase in wetter seasons
11 Concentration of T-2 / HT-2 and DON in barley compared with malt
12 Mean T-2 + HT-2 Mean HT-2 +T-2 (µg/kg) Barley Malt Harvest year 80 to 95 barley & malt pairs per year
13 Mean DON Mean DON (µg/kg) Barley Malt Harvest year 80 to 95 barley & malt pairs per year
14 Max T-2 + HT-2 + T-2 (µg/kg) Maximum HT Barley Malt Harvest year 80 to 95 barley & malt pairs per year
15 Maximum DON Maximum DON (µg/kg) Barley Malt Harvest year 80 to 95 barley & malt pairs per year
16 Concentration of T-2/HT-2 and DON in barley compared with malt Concentrations (both means and maximum levels) of T-2+HT-2 in malt always a lot lower than those in barley Concentrations of DON in malt generally lower than those in barley, but may increase in years when DON in barley is high
17 Distribution of T-2 and HT-2 in barley compared with malt
18 Distribution of T-2 +HT-2 in barley and malt from the 2008 harvest % of samples Barley Malt 0 <LOD (1,25) <LOQ (3,5) <5 <5->10 >10 - <50 >50 - <100 >100 - <200 >200 T-2 + HT-2 (µg/kg) 95 barley & malt pairs
19 Distribution of T-2 +HT-2 in barley and malt from the 2008 harvest T-2 + HT-2 is below limit of quantification in most malt samples Pattern is same as in previous years
20 Winter v Spring barleys
21 T-2 + HT-2 in winter and spring barleys % of sa amples <LOD (1,25) Winter Spring <LQ (<3,5) <5 >5 <10 >10 <50 >50 <100 >100 <200 T-2 + HT-2 ug/kg 60 spring barleys & 17 winter barleys
22 T-2 + HT-2 in malt prepared from winter and spring barleys % of sa amples <LOD (1,25) Winter Spring <LQ (<3,5) <5 >5 <10 >10 <50 >50 <100 >100 <200 T-2 + HT-2 ug/kg 60 malts from spring barleys & 17 malts from winter barleys
23 Spring v Winter varieties French data from the 2006 and 2007 harvests presented at the 2008 Fusarium Forum suggested that T-2 and HT- 2 might be lower in winter barley compared with spring barley Europe-wide data from the 2007 harvest suggested little difference between winter and spring barleys in occurrence and levels of HT-2: T-2 slightly lower in winter varieties Europe-wide data from the 2008 harvest suggest higher levels of T-2+HT-2 in spring barleys but the difference disappears after malting
24 Is there a correlation between T-2 + HT-2 in barley and in malt?
25 T-2+HT-2 in barley compared with malt 25 T2+HT2 in malt (µg/kg) R 2 = 0, T2+HT2 in barley (µg/kg) 95 barley & malt pairs
26 Conclusions from survey Upward trend in the incidence of T-2 and HT-2 toxins observed until 2006 but this has since stabilised Incidence of DON does not parallel that of T-2 + HT-2 DON varies from year to year; related to climatic conditions T-2 and HT-2 not significantly higher in wet years Sample set is too small to pick up significant differences between regions or countries
27 Conclusions from survey Mean and maximum concentrations of T-2 generally lower than those of HT-2 in both barley and malt Mean and maximum concentrations of both T-2 and HT- 2 are significantly lower in malt than in the starting barley But no reliable correlation between T-2 + HT-2 in barley and that in corresponding malt
28 Preliminary research commissioned by Euromalt NB: these partial results are from single small scale experiments only.
29 The malting process Raw barley grain Steeping Germination Kilning MALT
30 Factors which could possibly affect loss of T-2 and HT-2 during steeping Amount of water used Temperature of steep water ph of steep water Number of steeps Duration of steeps Extent of mixing / turbulence during steeping Thickness of husk Others?
31 Food safety and traceability Possible toxin dilution from grain to glass Malthouse 1 Silo 1 Malthouse 2 Silo 2 Malthouse 3 Silo 3 Prod. 1 Prod. 2 Prod. 3 Prod. 4 Prod. 5 Prod. 6 Prod. 7 Silo barley trader 1 trader 2 trader 3 farm 1 farm 2 farm 3 farm 4 farm... farm20 field 1 field 2 field 3 field t 150 t 1000 t 1000 t 3 Malthouses x 3 Malt silos x 1 Barley silos x 3 Barley originators x 20 Farmers 540 Farmers Fields
32 Euromalt is committed to Study on the origins as well as means of controlling the development of these toxins, if there are any, in the field (under evaluation): To assess why the incidence of F. langsethiae is increasing in Europe (biology of the strain, fungi population s ecology in barley fields) To identify the main agronomic factors contributing to this increase (tillage, pre-crop, others?) To find out if there are any resistant varieties available To study what can be done to reduce F. langsethiae infection and toxin production in the field (natural and artificial antagonisms, fungicides)
33
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5 th EC Forum on Fusarium toxins. Brussels, January 10-11 th, 2008 T-2, HT-2 2 and deoxynivalenol (DON) in malting barley and malt Ian Slaiding Outline of presentation What is Euromalt Summary of evidence
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