Document Detail

Behavior of Listeria monocytogenes in avocado pulp and processed guacamole.
MedLine Citation:
PMID:  12430696     Owner:  NLM     Status:  MEDLINE    
The potential ability of Listeria monocytogenes to grow or survive in avocado pulp (AP) and processed guacamole (PG) stored at 22, 4 to 7, and -18 degrees C was studied. Both products were obtained from a factory in Michoacan, Mexico. PG consisted of AP mixed with dehydrated vegetables, antioxidants, and preservatives. Populations of L monocytogenes in AP stored at 22 degrees C increased from 2 to 6 and 9 log CFU/g after 24 and 48 h, respectively. At 4 to 7 degrees C, the growth rate of L monocytogenes in AP was greatly decreased; generation time was 8.2 h, in contrast with 1.35 h observed at 22 degrees C. L. monocytogenes populations did not increase in PG either at 22 degrees C for 48 h or at 4 to 7 degrees C for 15 days. The bacteriostatic effect in PG may have resulted from the presence of added substances, especially citric acid and disodium dihydrogen pyrophosphate. Aerobic plate counts and coliforms increased in AP and PG stored at ambient temperature and under refrigeration. However, these increments did not affect the growth of the pathogen. L. monocytogenes (50,000 most probable number [MPN]/g) survived at least 58 weeks in both products stored frozen at -18 degrees C; the final population was 335 MPN/g in AP and 23 MPN/g in PG. Although the composition of avocado fruit differs significantly (high content of lipids and scarcity of simple carbohydrates) from that typical of most fruits, these results underline AP as a potential vehicle of human listeriosis and indicate that freezing should not be used as the sole mechanism to control this pathogen.
Montserrat H Iturriaga; Sofia M Arvizu-Medrano; Eduardo F Escartín
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of food protection     Volume:  65     ISSN:  0362-028X     ISO Abbreviation:  J. Food Prot.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-11-14     Completed Date:  2003-01-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7703944     Medline TA:  J Food Prot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1745-9     Citation Subset:  IM    
Departamento de Investigación y Posgrado en Alimentos, Facultad de Química, Universidad Autónoma de Querétaro, Querétaro, México.
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MeSH Terms
Colony Count, Microbial
Food Contamination / analysis
Food Microbiology
Food Preservation / methods*
Listeria monocytogenes / growth & development*
Persea / microbiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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