Oxygen transmission rate of screwcaps by chemoluminescence and air/capsule/headspace/acidified water system
2011
Vidal, Jean-Claude | Guillemat, Bruno | Chayvialle, Cécile
375mL flint bordelaises were filled with acidified ultrapure water (pH 1.5) and closed with 2 types of caps (Saran tin, Saranex). The liquid was deoxygenated via bubbling with a blend of 50%CO2 50%N2. 3-4 dry ice ministicks were placed on the surface. A drop of liquid nitrogen was deposited in the cap just before placement on the bottle. Dissolved and gaseous O2 contents were measured with a PreSens probe for 63 days of storage at 20 and 35°C in the vertical position on 8 bottles/procedure mechanically agitated for 30mn from TO to TO+63 days (17 analysis dates). The average total O2 concentration at TO was 6.3±3.7 μg/bottle. At both temperatures, the total O2 content remained stable for the 63 days for bottles with Saran tin seal proving that there was neither consumption nor penetration of oxygen. The Oxygen Transmission Rate (OTR) of the closure is thus nearly nil. For the Saranex seal, the content increases with temperature. The slope, thus speed of penetration of the oxygen, of the regression line (R2 > 0.992) was 2.6 and 4 μg/d/bottle respectively at 20 and 35°C.
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