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 162
- Downloads 0
Development and bioevaluation of 99mTc(CO)3-labeled (1-azido-1-deoxy-β-D-glucopyranoside) complex as a potential tumor-seeking agent
The 1,2,3-triazole-containing (1-azido-1-deoxy-β-D-glucopyranoside) complex was synthesized using click chemistry approach and evaluated its potential as a tumor-seeking agent. In the present study, 99mTc-tricarbon...
Anti-inflammatory effects of Citrus sinensis L., Citrus paradisi L. and their combinations
Citrus bioflavonoids embrace a wide group of phenolic compounds effecting the production and scavenging of reactive oxygen species and the processes relating free radical-mediated injury. Keeping in view of the ant...
Hijama improves overall quality of life in chronic renal failure patients: A pilot study
Present study assesses the therapeutic effectiveness of Hijama (blood letting) inpatients of chronic renal failure undergoing hemodialysis for past several years with almost no urinary output.24 patients from Sindh...
Antiinflammatory, analgesic and antipyretic activities of ethanolic root extract of Croton zambesicus
The ethanolic root extract of C. zambesicus (27-81mg/kg) was evaluated for antiiflammatory, analgesic and antipyretic properties in mice. The extract (27-81mg/kg) demonstrated a weak antiinflammatory activity. However, a...
Prevention infection of newborn nosocomial and distribution of multiple drug resistant organism of the medicinal
2124 neonates were monitored from February 2013 to August 2014, among which 1119 were admitted from outpatient department (outpatient group), 782 were transferred from other departments (other department group), an...