metMB


Also found in: Medical.
AcronymDefinition
metMBmetmyoglobin
References in periodicals archive ?
Se observo una interaccion (p<0,001) entre el lote y el periodo de conservacion para la proporcion de MetMb (Tabla 2).
The methemyoglobin (metHb) and metmyoglobin (metMb) thus generated, as well as their derivatives are capable to produce more ROS, besides lipid peroxidation, with formation of hydroperoxides (59,62).
The relative proportions (%) of oxymyoglobin (OxyMb) and metmyoglobin (MetMb) were calculated according to Krzywicki's method [11].
The colour of meat is determined by the relative amount of three myoglobin derivatives; i) reduced myoglobin, deoxymyoglobin (Mb), which is the purple pigment of deep muscle and known from meat under vacuum, ii) oxygenated myoglobin, oxymyoglobin (MbO2), which is bright cherry red and considered to signify fresh meat by the consumer, and iii) oxidised myoglobin, metmyoglobin (MetMb), which is grey-brown (Rosenvold and Anderson, 2003).
Methaemoglobin (MetHb) or Metmyoglobin (MetMb) reacts with hydrogen peroxide or lipid hydroperoxides to generate ferryl heme protein radicals, which can abstract hydrogen from polyunsaturated fatty acids thus initiating lipid oxidation (Miller et al., 1997).
The growth of Pseudomonas constantly reduces the partial pressure of oxygen and gradually promotes the formation of metmyoglobin (metMb), resulting in a gradual change in meat color.
At 5 days of storage, MetMb concentration of meat from cattle with S+Vit E supplementation was significantly lower (p<0.05) than from cattle with Vit E supplementation; and at 10 days of storage, MetMb concentration of meat from cattle with S+Vit E supplementation was significantly lower (p<0.05) than from other groups.