Authenticity of Irish Grass-fed Beef: Multi-elemental and stable isotope ratio analysis

Reliable and robust analytical methods are required to authenticate Irish grass-fed beef. Irish beef is advertised on a national and international level as a premium product due to the high quality of the grass-based production systems. There is an increasing demand to scientifically support the standard of the Irish grass-based production systems and the renowned quality of the associated beef products. Currently, the guarantee solely relies on the records provided by producers. The composition must be analysed to identify the “signature” of beef from systems with different feeding regimes. Trace element analysis is a promising tool for meat authentication. The elemental composition of beef is directly influenced by local environmental factors such as geology, soil and weather. The trace element content can therefore be analysed to potentially determine the origins of the meat. Acid-assisted microwave digestion followed by inductively coupled plasma mass spectrometry (ICP-MS) analysis forms the basis of the authentication method. Trace element analysis complements other analytical techniques involved in the project such as stable isotope ratio analysis (SIRA), to develop an identity profile. Validity of the methods are confirmed using advanced statistical techniques. In this work, a large scale survey of Irish commercial beef was conducted to procure samples from the four main beef production systems. Beef samples, particularly from the predominantly grass- and concentrate-based production systems were discriminated based on their elemental and isotopic compositions. This methodology also allowed beef of Irish grassland origin to be correctly assigned and differentiated from international meat. A scientifically validated quality guarantee provides a strong foothold in overseas market, cements the international reputation of Irish beef and ultimately brings economic benefits to the Irish agricultural industry. Verification of cattle diet and geographical origin will ensure that consumers are confident in the quality and provenance of their meat products. Furthermore, a proactive initiative of introducing a chemical label (through diet supplements) to authenticate beef without relying on a direct relationship to the local environment is also in the early stages of development.