A vital amino acid in the assimilation of nutrients by animals, methionine is a powerful efficiency driver for free-range and intensive farming, where it is used as a food supplement. At Kerteh, Malaysia, Arkema’s partner CheilJedang is producing methionine with a world-first industrial process that uses a sulfur derivative supplied by Arkema (methyl-mercaptan) and bio-based raw materials. This energy efficient process synthesizes only the most “useful” form – L-methionine.
Just 0.1 to 0.2% of methionine in a chicken’s feed is enough to significantly impact its metabolism and growth curve. To reach a given muscle weight will take only half the amount of feed and far less time And yet, methionine is neither a doping agent nor a wonderdrug: “It is an amino acid that is essential to the synthesis of proteins in both animals and humans, and which is naturally found in limited quantities in various cereals and pulses,” says Georges Frémy, a thiochemicals expert at Arkema. “But for the animal to assimilate the amount needed to reach a good metabolism, it would have to be overfed, which is pointless, and that’s why we need properly dosed supplementation,” he goes on. Methionine supplements have been used in feed for poultry and other livestock for almost 80 years, and are essentially a means for farmers to optimize the resources required for the development of their animals, while promoting the best-quality meat (muscle rather than fat). This efficiency driver is more vital than ever, with the global population standing at 7.7 billion and potentially reaching 9.8 billion by 2050: “Demand for meat is growing fast, especially in Asia, and that’s putting a lot of pressure on the use of agricultural land,” continues Georges Frémy. “Methionine helps to secure this source of protein at the minimum level required, and that frees up more crops for human consumption.”
Methionine is widely used today, especially in the farming of poultry, pigs and prawns. But such success naturally comes at a cost: “The traditional industrial processes for chemical synthesis have a high demand for energy and are based on oil resources,” points out Georges Frémy. Moreover, they can only produce DL-methionine, which contains equal quantities of the L-form and D-form of the amino acid. “But only L-methionine, the natural form, is useful to animals, because only L-form can be used for protein synthesis” explains the expert. “Their organisms can metabolize the D-form into L, but research shows that the trans-formation reduces the effectiveness of the supplement compared to natural L-methionine.”