pH-metric determination of the acid value of vegetable oils without titration
The acid value (AV) of vegetable oils is determined without titration by using a new reagent consisting of triethanolamine in a solution of water and isopropyl alcohol. When the oil sample is mixed with the reagent in the pH-metric cell, free fatty acids from the sample are extracted into the reagen...
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| Veröffentlicht in: | Journal of AOAC International 1998-07, Vol.81 (4), p.873-879 |
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| container_title | Journal of AOAC International |
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| creator | Kuselman, I. (The National Physical Laboratory of Israel, Givat Ram, Jerusalem, Israel.) Tur'yan, Y.I Berezin, O.Y Kogan, L Shenhar, A |
| description | The acid value (AV) of vegetable oils is determined without titration by using a new reagent consisting of triethanolamine in a solution of water and isopropyl alcohol. When the oil sample is mixed with the reagent in the pH-metric cell, free fatty acids from the sample are extracted into the reagent (3-4 min). The initial pH, called conditional pH'1, is measured, a standard acid (HCl) is added, and the final pH, pH'2 is measured. AV is calculated from the difference between pH'1 and pH'2. The method is applicable for quality control of vegetable oils during their production, trade, and use |
| doi_str_mv | 10.1093/jaoac/81.4.873 |
| format | Article |
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(The National Physical Laboratory of Israel, Givat Ram, Jerusalem, Israel.) ; Tur'yan, Y.I ; Berezin, O.Y ; Kogan, L ; Shenhar, A</creator><creatorcontrib>Kuselman, I. (The National Physical Laboratory of Israel, Givat Ram, Jerusalem, Israel.) ; Tur'yan, Y.I ; Berezin, O.Y ; Kogan, L ; Shenhar, A</creatorcontrib><description>The acid value (AV) of vegetable oils is determined without titration by using a new reagent consisting of triethanolamine in a solution of water and isopropyl alcohol. When the oil sample is mixed with the reagent in the pH-metric cell, free fatty acids from the sample are extracted into the reagent (3-4 min). The initial pH, called conditional pH'1, is measured, a standard acid (HCl) is added, and the final pH, pH'2 is measured. AV is calculated from the difference between pH'1 and pH'2. The method is applicable for quality control of vegetable oils during their production, trade, and use</description><identifier>ISSN: 1060-3271</identifier><identifier>EISSN: 1944-7922</identifier><identifier>DOI: 10.1093/jaoac/81.4.873</identifier><identifier>PMID: 9680713</identifier><language>eng</language><publisher>Gaithersburg, MD: AOAC International</publisher><subject>2-Propanol ; ACEITES VEGETALES ; ACIDEZ ; ACIDITE ; ACIDITY ; ALCOHOLES ; ALCOHOLS ; ALCOOL ; ALIMENTOS ; AMINAS ; AMINE ; AMINES ; Biological and medical sciences ; CONTROLE DE PERFORMANCE ; ENSAYO ; Ethanolamines ; Fat industries ; FOOD ANALYSIS ; Food industries ; FOODS ; Fundamental and applied biological sciences. Psychology ; HUILE VEGETALE ; Hydrogen-Ion Concentration ; Indicators and Reagents ; ISOPROPYL ALCOHOL ; MEASUREMENT ; MEDICION ; MESURE ; PEER VERIFIED METHODS ; PERFORMANCE TESTING ; PLANT OILS ; Plant Oils - analysis ; PRODUIT ALIMENTAIRE ; PRUEBAS DE RENDIMIENTO ; Quality Control ; Reference Standards ; TEST PROCEDURE ; TESTAGE ; TESTING ; TRIETHYLAMINE</subject><ispartof>Journal of AOAC International, 1998-07, Vol.81 (4), p.873-879</ispartof><rights>1998 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c381t-5a8c70a99edff3790ac12bf2523f005063491c40e013627645baa1dbf3b180e43</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2315763$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/9680713$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Kuselman, I. (The National Physical Laboratory of Israel, Givat Ram, Jerusalem, Israel.)</creatorcontrib><creatorcontrib>Tur'yan, Y.I</creatorcontrib><creatorcontrib>Berezin, O.Y</creatorcontrib><creatorcontrib>Kogan, L</creatorcontrib><creatorcontrib>Shenhar, A</creatorcontrib><title>pH-metric determination of the acid value of vegetable oils without titration</title><title>Journal of AOAC International</title><addtitle>J AOAC Int</addtitle><description>The acid value (AV) of vegetable oils is determined without titration by using a new reagent consisting of triethanolamine in a solution of water and isopropyl alcohol. When the oil sample is mixed with the reagent in the pH-metric cell, free fatty acids from the sample are extracted into the reagent (3-4 min). The initial pH, called conditional pH'1, is measured, a standard acid (HCl) is added, and the final pH, pH'2 is measured. AV is calculated from the difference between pH'1 and pH'2. The method is applicable for quality control of vegetable oils during their production, trade, and use</description><subject>2-Propanol</subject><subject>ACEITES VEGETALES</subject><subject>ACIDEZ</subject><subject>ACIDITE</subject><subject>ACIDITY</subject><subject>ALCOHOLES</subject><subject>ALCOHOLS</subject><subject>ALCOOL</subject><subject>ALIMENTOS</subject><subject>AMINAS</subject><subject>AMINE</subject><subject>AMINES</subject><subject>Biological and medical sciences</subject><subject>CONTROLE DE PERFORMANCE</subject><subject>ENSAYO</subject><subject>Ethanolamines</subject><subject>Fat industries</subject><subject>FOOD ANALYSIS</subject><subject>Food industries</subject><subject>FOODS</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>HUILE VEGETALE</subject><subject>Hydrogen-Ion Concentration</subject><subject>Indicators and Reagents</subject><subject>ISOPROPYL ALCOHOL</subject><subject>MEASUREMENT</subject><subject>MEDICION</subject><subject>MESURE</subject><subject>PEER VERIFIED METHODS</subject><subject>PERFORMANCE TESTING</subject><subject>PLANT OILS</subject><subject>Plant Oils - analysis</subject><subject>PRODUIT ALIMENTAIRE</subject><subject>PRUEBAS DE RENDIMIENTO</subject><subject>Quality Control</subject><subject>Reference Standards</subject><subject>TEST PROCEDURE</subject><subject>TESTAGE</subject><subject>TESTING</subject><subject>TRIETHYLAMINE</subject><issn>1060-3271</issn><issn>1944-7922</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpNkMtLxDAQxoMoPlav3oQexFvXmSR95CjiC1Y8qOcwTRONtNs1SVf87626iKd5fL_5Bj7GjhHmCEqcv9FA5rzGuZzXldhi-6ikzCvF-fbUQwm54BXusYMY3wAklsB32a4qa6hQ7LP71W3e2xS8yVqbbOj9kpIfltngsvRqMzK-zdbUjfZ7s7YvNlHTTYPvYvbh0-swpiz5FH6uDtmOoy7ao02dsefrq6fL23zxcHN3ebHIjagx5QXVpgJSyrbOiUoBGeSN4wUXDqCAUkiFRoIFFCWvSlk0RNg2TjRYg5Vixs5-fVdheB9tTLr30diuo6UdxqhrAAFYVBM4_wVNGGIM1ulV8D2FT42gv_PTP_npGrXUU37TwcnGeWx62_7hm8Am_XSjUzTUuUBL4-MfxsX0tfxn42jQ9BIm5PkRlVIAHJGLLzv_gWw</recordid><startdate>19980701</startdate><enddate>19980701</enddate><creator>Kuselman, I. (The National Physical Laboratory of Israel, Givat Ram, Jerusalem, Israel.)</creator><creator>Tur'yan, Y.I</creator><creator>Berezin, O.Y</creator><creator>Kogan, L</creator><creator>Shenhar, A</creator><general>AOAC International</general><scope>FBQ</scope><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>19980701</creationdate><title>pH-metric determination of the acid value of vegetable oils without titration</title><author>Kuselman, I. (The National Physical Laboratory of Israel, Givat Ram, Jerusalem, Israel.) ; Tur'yan, Y.I ; Berezin, O.Y ; Kogan, L ; Shenhar, A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c381t-5a8c70a99edff3790ac12bf2523f005063491c40e013627645baa1dbf3b180e43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>2-Propanol</topic><topic>ACEITES VEGETALES</topic><topic>ACIDEZ</topic><topic>ACIDITE</topic><topic>ACIDITY</topic><topic>ALCOHOLES</topic><topic>ALCOHOLS</topic><topic>ALCOOL</topic><topic>ALIMENTOS</topic><topic>AMINAS</topic><topic>AMINE</topic><topic>AMINES</topic><topic>Biological and medical sciences</topic><topic>CONTROLE DE PERFORMANCE</topic><topic>ENSAYO</topic><topic>Ethanolamines</topic><topic>Fat industries</topic><topic>FOOD ANALYSIS</topic><topic>Food industries</topic><topic>FOODS</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>HUILE VEGETALE</topic><topic>Hydrogen-Ion Concentration</topic><topic>Indicators and Reagents</topic><topic>ISOPROPYL ALCOHOL</topic><topic>MEASUREMENT</topic><topic>MEDICION</topic><topic>MESURE</topic><topic>PEER VERIFIED METHODS</topic><topic>PERFORMANCE TESTING</topic><topic>PLANT OILS</topic><topic>Plant Oils - analysis</topic><topic>PRODUIT ALIMENTAIRE</topic><topic>PRUEBAS DE RENDIMIENTO</topic><topic>Quality Control</topic><topic>Reference Standards</topic><topic>TEST PROCEDURE</topic><topic>TESTAGE</topic><topic>TESTING</topic><topic>TRIETHYLAMINE</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kuselman, I. (The National Physical Laboratory of Israel, Givat Ram, Jerusalem, Israel.)</creatorcontrib><creatorcontrib>Tur'yan, Y.I</creatorcontrib><creatorcontrib>Berezin, O.Y</creatorcontrib><creatorcontrib>Kogan, L</creatorcontrib><creatorcontrib>Shenhar, A</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of AOAC International</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kuselman, I. (The National Physical Laboratory of Israel, Givat Ram, Jerusalem, Israel.)</au><au>Tur'yan, Y.I</au><au>Berezin, O.Y</au><au>Kogan, L</au><au>Shenhar, A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>pH-metric determination of the acid value of vegetable oils without titration</atitle><jtitle>Journal of AOAC International</jtitle><addtitle>J AOAC Int</addtitle><date>1998-07-01</date><risdate>1998</risdate><volume>81</volume><issue>4</issue><spage>873</spage><epage>879</epage><pages>873-879</pages><issn>1060-3271</issn><eissn>1944-7922</eissn><abstract>The acid value (AV) of vegetable oils is determined without titration by using a new reagent consisting of triethanolamine in a solution of water and isopropyl alcohol. When the oil sample is mixed with the reagent in the pH-metric cell, free fatty acids from the sample are extracted into the reagent (3-4 min). The initial pH, called conditional pH'1, is measured, a standard acid (HCl) is added, and the final pH, pH'2 is measured. AV is calculated from the difference between pH'1 and pH'2. The method is applicable for quality control of vegetable oils during their production, trade, and use</abstract><cop>Gaithersburg, MD</cop><pub>AOAC International</pub><pmid>9680713</pmid><doi>10.1093/jaoac/81.4.873</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 1060-3271 |
| ispartof | Journal of AOAC International, 1998-07, Vol.81 (4), p.873-879 |
| issn | 1060-3271 1944-7922 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_80030157 |
| source | Oxford University Press Journals All Titles (1996-Current); MEDLINE |
| subjects | 2-Propanol ACEITES VEGETALES ACIDEZ ACIDITE ACIDITY ALCOHOLES ALCOHOLS ALCOOL ALIMENTOS AMINAS AMINE AMINES Biological and medical sciences CONTROLE DE PERFORMANCE ENSAYO Ethanolamines Fat industries FOOD ANALYSIS Food industries FOODS Fundamental and applied biological sciences. Psychology HUILE VEGETALE Hydrogen-Ion Concentration Indicators and Reagents ISOPROPYL ALCOHOL MEASUREMENT MEDICION MESURE PEER VERIFIED METHODS PERFORMANCE TESTING PLANT OILS Plant Oils - analysis PRODUIT ALIMENTAIRE PRUEBAS DE RENDIMIENTO Quality Control Reference Standards TEST PROCEDURE TESTAGE TESTING TRIETHYLAMINE |
| title | pH-metric determination of the acid value of vegetable oils without titration |
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