| Sequential injection titration with spectrophotometric detection for the assay of acidity in fruit juices. | |
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MedLine Citation:
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PMID: 16429794 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A simple sequential injection analysis (SIA) with spectrophotometric detection for an assay of acidity in fruit juice was investigated. An alkaline reagent (sodium hydroxide), a sample and an indicator (phenolphthalein) were first aspirated and stacked as adjacent zones in a holding coil. With flow reversal through a reaction coil to the detector, zone penetration occurred, leading to a neutralization reaction that caused a decrease in the color intensity of the indicator being monitored for absorbance at 552 nm. The effects of various parameters were studied. Linear calibration graphs for acidities of 0.2 - 1.0 and 0.5 - 2.5% w/v citric acid as a standard, with a relative standard deviation of 1% (acidity of 0.3 - 0.6% w/v as citric acid, n=11) and a sample throughput of 30 samples h(-1), were achieved. The developed method was validated by a standard titrimetric method for assaying the acidity of fruit juice samples. |
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Authors:
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Jaroon Jakmunee; Thitima Rujiralai; Kate Grudpan |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Analytical sciences : the international journal of the Japan Society for Analytical Chemistry Volume: 22 ISSN: 0910-6340 ISO Abbreviation: Anal Sci Publication Date: 2006 Jan |
Date Detail:
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Created Date: 2006-01-24 Completed Date: 2006-04-13 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8511078 Medline TA: Anal Sci Country: Japan |
Other Details:
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Languages: eng Pagination: 157-60 Citation Subset: IM |
Affiliation:
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Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand. scijjkmn@chiangmai.ac.th |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Beverages
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analysis* Calibration Citric Acid / analysis* Flow Injection Analysis / instrumentation, methods Food Analysis / instrumentation, methods Fruit / chemistry* Hydrogen-Ion Concentration Indicators and Reagents Phenolphthalein / chemistry Sensitivity and Specificity Sodium Hydroxide / chemistry Spectrophotometry / instrumentation, methods Time Factors Titrimetry / instrumentation, methods |
| Chemical | |
Reg. No./Substance:
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0/Indicators and Reagents; 1310-73-2/Sodium Hydroxide; 77-09-8/Phenolphthalein; 77-92-9/Citric Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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