Extrinsic Deterioration

Extrinsic deterioration Type of grain deterioration due to external factors such as insects, molds, and rodents. 

This outcome was consistent with a hypothesis that structural deterioration could have been a byproduct of microorganism activity. The higher lipid content in the poorly preserved tissue suggests that those lipids are primarily extrinsic, that is, that they were produced by bacteria and/or fungi. As the food source for such microorganisms, the protein within the bone may have been substantially altered in concert with the microstructure deterioration. The quantification of the changes to the organic fraction became our next focus of research. 

Weber et al., 1999). Thus, optimum colour stability can be achieved only by using a multifactorial approach, where both intrinsic and extrinsic factors are considered (Bertelsen et aL, 2000). From Fig. 9.7 the effect of the nitrite content on the rate of colour deterioration is evident. Increasing the nitrite content stabilises the colour. This result emphasises the necessity of investigating the specific product of interest in order to define critical levels of packaging and storage factors. 

Tohyama H, Yasuda K (2000) Extrinsic cell infiltration and revascularization accelerate mechanical deterioration of the patellar tendon after fibroblast necrosis. J Biomech Eng... 

In the case of food, antioxidants are substances with the ability to delay or prevent the development of rancidity and deterioration of sensory attributes related to flavors and aroma and also function as oxidation inhibitors or retarders. The effectiveness of these additives depends on a number of factors, like intrinsic factors, such as the composition (lipids, carbohydrates and proteins), pH, water activity and oxide reduction potential extrinsic factors, such as temperature, storage time, and humidity and atmospheric conditions processing factors and microbial factors, such as the type and quantity of microorganisms, resilience microorganisms and cellular composition (Davidson and Taylor 2007). 

Underground storage is considered one of the oldest practices to store a surplus of grains. The method protects the grain from unfavorable environmental conditions and inhibits pests due to the lower oxygen and high carbon dioxide concentration that diminishes both intrinsic and extrinsic grain deterioration (Sauer 1992). 

What are the differences between intrinsic and extrinsic grain deterioration ... 

Aeration Common operation performed in grain elevators, consisting of moving air through a bed of stored grain at low airflow rates with the aim of getting rid of the heat and moisture, and therefore lower respiration and extrinsic grain deterioration. 

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