Abstract
The small capacity PET bottle for soft drinks were developed in 1996. The production of bottled soft drinks was 18,000,000kL in 2003. The PET bottled drinks accounts for 56% of the market, which the 500mL container accounts has a 36.4% share. The 500mL PET bottled soft drinks is easy to carry. There are many people who directly drink from bottles and carry them for a long time. This suggested that this might cause some problems involving bacteriology. The results were as follows. Various kinds of oral bacterial flora because mixed in the bottled soft drinks by the direct drinking, but these bacteria decreased with time. Most bacteria mixed in the green tea and oolong tea drinks quickly decreased and were not detected after an 8 houre storage at 25°C. Some bacteria mixed in fruit juice, sport drinks and barley tea drinks slowly decreased and were detected after 8 hours at 25°C. The bacteria detected after 8 hours were Genus Staphylococcus and Genus Streptococcus mainly. As written on the label of the bottle, it is important to drink them as soon as possible after opening them.
