ISO Standards for Tea

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1ISO Standards for TeaIntergovernmental Group-on Tea10thSessionNew Dehli, 12-14 May 2010Andrew Scott, Chairman ISO TC/34 SC 8 Tea23Over3milliontonnesproducedInover30c ountriesProvidingover1000billioncupsofte aTea4International Standards are vital to facilitate international tradeTo ensure consumer expectations are metTo provide guidance and common understanding of Good Manufacturing practices via compositional specificationsTo provide validated methods of analysisInternational Standards for Tea51970 s-TeaCommitteebecameISOWorkingGroup8-ISO TechnicalCommittee34Sub-committee8 Tea1977-ISO3720Blackteastandard8testingm ethodstomeasurebasicteaparameters1980-IS O1839Samplingtea1980-ISO3103Preparationo fliquorforsensoryanalysis1982 -Glossary of terms1990 -Instant tea standard4 supporting test methodsInternational Standards for why measure polyphenols in tea?

Statistical methods: Cochrane test (duplicates), Dixon test (between laboratories), Friedman test (consistent highs/lows) Relative response factor relative to caffeine std (more convenient retention time than gallic acid) Standard purity assessments [ HPLC, NMR, moisture] Measuring …

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