Freshly-squeezed OJ was obtained froma local retailer and centrifuged
at 17,696 g for 40min to remove pulp. The supernatant (pulp-freeOJ)was
then filtered through sterile filter papers with pore sizes of 11 μm, 8 μm,
1.6 μm or 1.2 μm. The 1.2 μm-filtered OJ was also then filtered through
sterile 0.7 μm filter paper or 0.22 μm syringe filters.