EVALUATION OF IN-LINE SENSORS FOR PREDICTION OF SOLUBLE AND TOTAL SOLIDS MOISTURE IN CONTINUOUS PROCESSING OF FRUIT JUICES/

Citation
Pc. Singh et al., EVALUATION OF IN-LINE SENSORS FOR PREDICTION OF SOLUBLE AND TOTAL SOLIDS MOISTURE IN CONTINUOUS PROCESSING OF FRUIT JUICES/, Food control, 7(3), 1996, pp. 141-148
Citations number
7
Categorie Soggetti
Food Science & Tenology","Biothechnology & Applied Migrobiology
Journal title
ISSN journal
09567135
Volume
7
Issue
3
Year of publication
1996
Pages
141 - 148
Database
ISI
SICI code
0956-7135(1996)7:3<141:EOISFP>2.0.ZU;2-W
Abstract
Three inline sensors: Near-infra red (NIR) (Protonics P-112, Katrina I nc, Hagerstown, MD); Guided Microwave (Epsilon industrial Inc, Austin, TX) and Maselli refractometer (Maselli Measurements Inc, Stockton, CA ) were evaluated for continuous measurement of soluble and total solid s/total moisture in continuous processing of (8-16 Brix) apple, grape, pear; apple-cherry and apple-banana juices in a pilot scale processin g unit. Experiments were conducted in the temperature range 21-65 degr ees C, back pressure of 0-204 kPa, flow rare of 0.756-4.536 kilolit/h, and acidity of 0.3 to 0.6% malic acid, and pH range of: 3.2-3.9. The sensors were calibrated by off-line measurement of soluble solids from an Abbe refractometer and total solids/moisture by standard vacuum ov en method. The process temperature was found to have great effect on t he prediction of these sensors. The effects of acidity, back pressure and flow rate were negligible. High correlation coefficients were obta ined for calibration curves of the soluble and total solids in differe nt juices. Maselli refractometer gave excellent results for soluble so lids under different operating conditions. NIR Katrina analyser and GM Epsilon spectrometer gave goon results for soluble and total solids. The sensors were found to give reproducible results after prolonged us e and were not found to have any deposits or buildups. The present res earch shows that these sensors can satisfactorily be used for in-line processing of different juices in industries. Copyright (C) 1996 Elsev ier Science Ltd.