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 141
- Downloads 0
A simple and rapid approach to evaluate the in vitro in vivo role of release controlling agent ethyl cellulose ether derivative polymer
Diclofenac sodium (DCL-Na) conventional oral tablets exhibit serious side effects when given for a longer period leading to noncompliance. Controlled release matrix tablets of diclofenac sodium were formulated usin...
Nutritional values and antioxidant potential of some edible mushrooms of Kashmir valley
Mushrooms are considered rich in proteins, carbohydrates and other nutrients. The present study was carried out to evaluate some edible mushrooms of Kashmir valley for their protein, carbohydrate and lipid contents. The...
In vitro antioxidant effect of Camellia sinensis on human cell cultures
Camellia sinensisis traditionally used in many polyherbal preparations for the treatment of different diseases and infections. Its action has been associated with its antioxidant activities. In this study, antioxid...
Effect of a residue after evaporation from industrial vitamin C fermentation on chemical and microbial properties of alkali-saline soil
Residue after evaporation (RAE) from industrial vitamin C fermentation is emitted as a waste product at an amount of 60,000 tons per year in China. The disposal of RAE is difficult because of its high chemical oxyg...
Mining of protein based biomarkers for type 2 diabetes mellitus
Diabetes mellitus in general and Type 2 Diabetes (T2D) in particular, are very complex diseases with heterogeneous etiology. T2D results from the impaired secretion or action of the insulin with a clinical phenotype of p...