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NIR Spectroscopic Properties of Aqueous Acids Solutions.
MedLine Citation:
PMID:  22706373     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Acid content is one of the important quality attributes in determining the maturity index of agricultural product, particularly fruits. Despite the fact that much research on the measurement of acidity in fruits through non-destructive spectroscopy analysis at NIR wavelengths between 700 to 1,000 nm has been conducted, the same response towards individual acids is not well known. This paper presents NIR spectroscopy analysis on aqueous citric, tartaric, malic and oxalic solutions through quantitative analysis by selecting a set of wavelengths that can best be used to measure the pH of the solutions. The aquaphotomics study of the acid solutions has generated R<sup>2</sup> above 0.9 for the measurement of all acids. The most important wavelengths for pH are located at 918-925 nm and 990-996 nm, while at 975 nm for water.
Authors:
Ahmad Fairuz Omar; Hanafi Atan; Mohd Zubir Matjafri
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Publication Detail:
Type:  Journal Article     Date:  2012-06-15
Journal Detail:
Title:  Molecules (Basel, Switzerland)     Volume:  17     ISSN:  1420-3049     ISO Abbreviation:  Molecules     Publication Date:  2012  
Date Detail:
Created Date:  2012-06-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100964009     Medline TA:  Molecules     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  7440-50     Citation Subset:  IM    
Affiliation:
School of Distance Education, Universiti Sains Malaysia, 11800 Penang, Malaysia. thinker_academy@yahoo.com.
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