Survival of thermophilic spore-forming bacteria in a 90+ year old milk powder from Ernest Shackelton's Cape Royds Hut in Antarctica. Thermophile Research Unit

• Main Authors: Ron S Ronimus, Andreas Rueckert, Hugh W Morgan
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2005
• Subjects: Bacillus licheniformis; Bacillus subtilis; RAPD-PCR; thermophilic; Anoxybacillus flavithermus; Geobacillus stearothermophilus; Milk powder; Antarctica. Due; Cape Royds; New Zealand; Royds; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.524.7682; http://researchcommons.waikato.ac.nz/bitstream/handle/10289/959/Morgan thermophilic.pdf;jsessionid=559248CE352AD6000677B28EE9754008?sequence=1

produced in New Zealand by a roller drying process in the first factory in the world dedicated to this process. Thermophilic bacilli are the dominant contaminants of modern spray-dried milk powders and the 1907 milk powder allows a comparison to be made of contaminating strains in roller-dried and spray-dried powders. Samples of milk powder obtained from Shackelton’s Hut at Cape Royds had low levels of thermophilic contamination (<500 cfu ml–1) but the two dominant strains (Bacillus licheniformis strain F and Bacillus subtilis) were typical of those found in spray-dried powders. Soil samples from the floor of the hut also contained these strains, whereas soils distant from the hut did not. Differences in the RAPD profiles of isolates from the milk powder and the soils suggest that contamination of the milk from the soil was unlikely. It is significant that the most commonly encountered contaminant strain in modern spray-dried milk (Anoxybacillus flavithermus strain C) was not detected in the 1907 sample.