Design of a microbial contamination detector and analysis of error sources in its optical path
Journal Title: Pakistan Journal of Pharmaceutical Sciences - Year 2014, Vol 27, Issue 3
Abstract
Microbial contamination is a growing concern in the food safety today. To effectively control the types and degree of microbial contamination during food production, this paper introduces a design for a microbial contamination detector that can be used for quick in-situ examination. The designed detector can identify the category of microbial contamination by locating its characteristic absorption peak and then can calculate the concentration of the microbial contamination by fitting the absorbance vs. concentration lines of standard samples with gradient concentrations. Based on traditional scanning grating detection system, this design improves the light splitting unit to expand the scanning range and enhance the accuracy of output wavelength. The motor rotation angle φ is designed to have a linear relationship with the output wavelength angle λ, which simplifies the conversion of output spectral curves into wavelength vs. light intensity curves. In this study, we also derive the relationship between the device’s major sources of errors and cumulative error of the output wavelengths, and suggest a simple correction for these errors. The proposed design was applied to test pigments and volatile basic nitrogen (VBN) which evaluated microbial contamination degrees of meats, and the deviations between the measured values and the pre-set values were only in a low range of 1.15% - 1.27%.
Authors and Affiliations
Chao Zhang, Xiang Yu , Xingju Liu , Lei Zhang
Keywords
Related Articles
- EP ID EP88422
- DOI -
- Views 170
- Downloads 0
Effect of curcumin on diabetic rat model of cerebral ischemia
To investigate the effect of curcumin on cerebral ischemia in diabetic rats the effects and features. intravenous injection alloxan diabetes model, to give alloxan first seven days the tail measured blood glucose v...
Sensitivity pattern of ceftriaxone against different clinical isolates
Emerging resistance against broad-spectrum antibiotics for standard empiric therapy is a global concern. Ceftriaxone (broad spectrum, third generation cephalosporin) is widely used in tertiary care settings to trea...
Synthesis, characterization and biological activity of some 1, 3, 4-thiadiazol derivatives
Thiadiazoles are their derivatives exhibit a wide variety of pharmacological activities such as Antibacterial and anti-inflammatory. In the present study we have synthesized derivatives some 2,5 substituted 1,3,4- thiadi...
Accentuating the prodigious significance of Eclipta alba – An inestimable medicinal plant
Eclipta alba is a small branched perennial herb, which has been used as a traditional medicine in different countries mainly in tropical and subtropical regions of the world. The plant E. alba plays a significant role in...
Lack of association between MTHFR gene polymorphisms and response to methotrexate treatment in Pakistani patients with rheumatoid arthritis
Methylenetetrahydrofolate reductase (MTHFR) gene polymorphisms have been reported to be associated with response to methotrexate (MTX) in certain populations of patients with rheumatoid arthritis (RA). This study a...