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The effects of two ammonium propionate formulations on growth in vitro of Aspergillus species isolated from hay
Author(s) -
Magan N.,
Lacey J.
Publication year - 1986
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1986.tb01076.x
Subject(s) - hay , propionate , aspergillus niger , biology , aspergillus fumigatus , ammonium , zoology , aspergillus , botany , food science , chemistry , biochemistry , organic chemistry
The efficacy of fully neutralized (AP) and half‐neutralized ammonium propionate (H‐AP) against growth of a number of Aspergillus spp. was determined in vitro on malt extract at different levels of water availability in the range 0.995–0.85 a w (water activity) (= 40–25% water content of hay). In general, Aspergillus flavus, A. fumigatus, A. nidulans, A. niger and A. versicolor were more sensitive to the H‐AP in the range 0.995–0.95 a w than to AP. At 0.90 and 0.85 a w growth of most species occurred in the absence of chemicals but only of a few species in 27 mmol/l AP. All three members of the A. glaucus group tested, A. amstelodami, A. repens and A. sejunctus , were similarly more sensitive to H‐AP over the a w range 0.95–0.85 than to AP. Aspergillus sejunctus was most tolerant, growing in 27 mmol/l H‐AP and 54 mmol/l AP at 0.85 a w. The number of days for growth initiation in 27 mmol/l H‐AP was greater than with AP at different levels of water availability and reflected the different effects of the two chemicals on growth rate.