1659-4266 1659-4266 S1659-42662019000300334 10.22458/urj.v11i3.2627 Costa Rica 00 12 2019 00 12 2019 11 3 334 344

1999 2014 2009 AOAC 2016 2012 1995 2011 EcoTenda 2013 Ente Costarricense de Acreditación 2015 1996 2012 2018 2011 2009 2002 2018 Ministerio de Salud 2007 2018 1991 2017 2010 Sigma-Aldrich 2016 2006 1993