Antimicrobial effects of butylated hydroxyanisole alone or in combination with potassium sorbate on quality changes in palm oil co-inoculated withAspergillus flavus andBacillus spp
✍ Scribed by Efiuvwevwere, B?J?O; Efi, Essien U
- Book ID
- 101225903
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 88 KB
- Volume
- 79
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
Palm oil was sterilised and subjected to different concentrations (0.2 to 1.0 g litre À1 ) of butylated hydroxyanisole (BHA) alone or in combination with potassium sorbate (KS) and coinoculated with Aspergillus ¯avus and Bacillus species, the most prevalent organisms isolated from the palm oil. A dramatic increase of c3.43, 3.16 or 1.83 log 10 cfu ml À1 microbial populations occurred in control samples or those treated with 0.2 or 1.0 g litre À1 of BHA alone respectively. On the contrary, populations lower by approximately 1.0±1.3 log 10 cfu ml À1 occurred in samples subjected to the combination treatment. Bi-phasic minima-extended-lag-phases were observed in the samples treated with BHA KS. Mycelial growth was markedly inhibited in samples preserved with BHA KS, being more apparent at concentrations of between 0.4 and 0.8 g litre À1 of BHA in combination with potassium sorbate. Similarly, signi®cantly (P = 0.05) lower free fatty acid content was observed in samples subjected to the combination treatment particularly at concentrations ranging from 0.6 litre À1 . Changes in pH were minimal suggesting less microbial activity, but signi®cantly lower values occurred in samples treated with BHA alone after 14 days of ambient (30(AE3) °C) storage. Better sensory qualities (less `separation' i.e enhanced stability and aroma) were exhibited by samples preserved with the combination of BHA with KS. These various induced changes demonstrate the importance of concentration, residence time and synergism in relation to the effectiveness of antimicrobial agents. The bene®ts of the application of combination treatments have been shown and could be exploited by palm oil processors and importers. However, samples treated with the low concentrations are more likely to present potential hazards to consumers.