(SeeNews) - Jan 21, 2013 - BNDESPar, the investment arm of Brazil's National Social and Economic Development Bank (BNDES), has bought a 15% stake in Brazil-based biofuel firm GraalBio Investimentos SA for BRL 600 million (USD 293.9m/EUR 221m), Bernardo Gradin, CEO of local diversified holding company Graal SA, revealed today.