The effect of infestation by Red-Rust Flour Beetle Tribolium castaneum Hbst. on the quality of Flour and Its Products.

Abstract

Abstract The results showed that there were significant differences in the numbers of the rust-red flour beetle Tribolium castaneum among dealings of the three treatments: 2, 3 and 4 pairs of the beetle / 0.5 kg flour, after a period of 3 months of infection, which was reflected on the properties of flour in general and when compared with uninfected sample in different qualities covered by the sensory evaluation form approved by the American Institute of baking showing a significant decrease of the loaf volume , specific volume and also taste, colour and smell of the pulp , chewing and textures in addition to colour of the crust . These pairs of the 3 treatments has produced large numbers of insect individuals : larvae and pupae and adults, resulted in 147, 268 and 316 individuals respectively , it was found that the size of loaf made from healthy flour sample increased than the size of the plant samples infected about 37.5%. For the color and crust appearance the healthy sample of dough showed 30-48 % exceeds than the infected samples. With respect to internal characteristics the color of the pulp, smell and taste surpassed the sound sample of 38.5% - 45.5%, 59-84% and 74-157% respectively. For the two recipe of chewing and strength 57-62% and 87-122 % for the three treatments. In total, the external and internal characteristic of the sample outperformed the sound samples infected by about 54% comparing with the 1st treatment till to 70 % for the 3rd treatment... As the proportion of gluten of samples infected weak compared amounted to treatment the first 25% and for the second 23% and the third 22%, while in comparison, 32%, resulting in recipes desirable loaf manufactured from the infected flour of the three treatments.

Keywords

Beetle, floure, products