Estimation of Shelf Life for Water-based Paints Using Regression Methods
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Date
2010-01-01
Authors
Obidi, O. F.
Nwachukwu, S.C.U.
Aboaba, O. O.
Nwalor, J. U.
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of American Science
Abstract
The shelf lives of water-based paints made in Nigeria were investigated. The mean changes in the microbial
population count of six freshly made paint samples (PS1 – PS6) were monitored fortnightly for a period of 10 months.
The growth data of isolated organisms from the fresh and spoilt paint samples were fitted into a multiple linear
regression model to predict shelf life for the fresh paint samples. The microbial population ranged from 1.0 x 101 – 4.7 x
105 cfu/ml and from 1.0 x 101 – 5.5 x 103 cfu/ml for bacteria and fungi over the study period. Physico-chemical
parameters such as specific gravity (SG), optical density (OD), transmittance (TR), pH and viscosity (VIS) were also
determined every two weeks for the fresh paint samples over the ten-month study period. The measurements of the
physico-chemical parameters suggested deterioration related to microbial population count of the paint samples.
Consequently, the model developed comprised of two equations with particular attention to microbial population count
and physico-chemical parameters of the paint samples. The microbial population counts of the spoilt paint samples were
3.4 x 1010 cfu/ml and 3.2 x 105 cfu/ml for bacteria and fungi respectively. The changes in the physico-chemical
parameters ranged from 2.8658 – 1.0853, 1.49 – 3.91, 6.9 – 2.3, 8.5 – 5.6, 11.7cst –10.8cst for SG, OD, TR, pH and VIS
in fresh paint samples. The percentage residual error between the shelf life predicted and the shelf life experimental
ranged between 0.001 and 0.500. The shelf lives obtained for the fresh paint samples were 19, 21, 23, 22, 37, and 22
months respectively.
Description
Scholarly article
Keywords
Shelf life , Physico-chemical parameters , Regressions , Research Subject Categories::NATURAL SCIENCES
Citation
Obidi, O.F., Nwachukwu, S.C., Aboaba, O.O. and Nwalor, J.U., 2010. Estimation of shelf life for water-based paints using regression methods. Journal of American Science, 6(4), pp.123-127.