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Estimation of Microbial Populations in Frozen Concentrated Orange Juice using Automated Impedance Measurements
Author(s) -
WEIHE J. L.,
SEIBT S. L.,
HATCHER W. S.
Publication year - 1984
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1984.tb13718.x
Subject(s) - orange juice , orange (colour) , food science , focused impedance measurement , electrical impedance , agar , technician , chromatography , chemistry , mathematics , bacteria , biology , engineering , electrical engineering , genetics
Automated impedance measurements were used to classify samples of frozen concentrated orange juice as acceptable (< 10 4 CFU/ml) or unacceptable (> 10 4 CFU/ml). Calibration curves relating initial microbial concentration to impedance detection time were generated for several orange juice isolates. Cut‐off times of 10.2 hr for bacteria and 15.8 hr for yeasts were adopted. More than 96% of 468 retail samples were correctly classified using automated impedance measurements. This technique has several advantages over other automated systems, including lower cost and reduced demand for technician time, and it provides reliable results much quicker than does the agar plate count.