Estimation of Shelf Life and Development of Packaging Standards for Bulk Packaging of Orthodox Tea [Camellia sinensis (L.) Kuntze] for Export

Abstract

Background: Tea is a shelf-stable product in which respiration processes are suspended, but biochemical, microbial and other decomposition processes continues depending upon the storage conditions. Considering the present problems, a study was undertaken with the objective to develop bulk packaging of Orthodox tea by taking up testing of packaging materials, shelf life studies and laying out specifications for bulk packaging of tea for the export market. Methods: The tea samples were packed in ten different packaging materials and exposed to accelerated climatic conditions (38±1°C and 90±2% RH) for a period of four months. The experiment was laid out in completely randomized design and replicated thrice. Result: The moisture content of Orthodox tea was showed a gradual increase during the exposure period. Heavy metals, total ash content and tannin content were found in permissible limits. The sorption isotherm of Orthodox tea was characterized by a sigmoid shape curve. No damage to the packaging materials was observed during transport worthiness test. The maximum shelf life of 105 days was attained in sandwich bag and PP woven sack with LDPE-EVOH-LDPE liner and 4 ply Multiwall Paper Sack with two liners at accelerated conditions. Based on this, it was concluded that the maximum estimated storage life at 27±1°C and 65±2% RH was 315 days and the same can be achieved by sandwich bag and PP woven sack with LDPE-EVOH-LDPE liner and 4 ply Multiwall Paper Sack with 7 µ Aluminium Foil/poly liner and 12 µ MET PET/poly liner.