Malachite Green and Leucomalachite Green Analysis

Introduction

Malachite green (MG) is an effective and inexpensive fungicide with a long history of use, mainly in Asian countries. There is concern about illegal use of MG because of potential harm to humans. MG entering water cycles is easily absorbed by fish tissue and is reduced to leucomalachite green (LMG) during metabolism. LMG accumulates in, and is stored in, fat tissue. Based on European Commission decision 2002/657/EC, a test method must be able to detect 2 micrograms of MG + LMG per kilogram of fish muscle.

Law amendment to prohibit use of malachite green, news.gov.hk, August 19, 2005