Abstract
The storage stability of preservative-free peanut butter was evaluated for changes in physicochemical quality including moisture content and water activity, microbiological properties, oxidative stability and textural quality in terms of spreadability and firmness. The study was conducted for 16 weeks at storage temperature of 10, 25 and 35 °C on natural and pure peanut butter produced from two varieties of peanuts, the Virginia and Spanish TMV-2 varieties of China and India origin, respectively. The peanuts were ground using a high speed grinder for 2.5 and 3.0 min to produce peanut butter without addition of other ingredient. The natural peanut butter exhibited stability and had acceptable microbial count during storage. Storage at 10 °C gave similar textural quality with commercial product until week 8 and without appreciable loss in oxidative stability until week 12. At higher storage temperatures of 25 and 35 °C, oxidative stability was shortened to 4 weeks of storage. Among the factors of storage temperature and time, grinding time and peanut variety, storage temperature had the most significant effects on quality changes of natural peanut butter.
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Authors are thankful to the Ministry of Education of Malaysia and Universiti Sains Malaysia for their financial support of scholarship programme under Academic Staff Teaching Schemes (ASTS/SLAI), and Universiti Putra Malaysia for funding of this project through Research University Grant Scheme No. 05-02-11-1399RU.
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1. The natural peanut butter had acceptable microbial count during storage
2. Storage at 10 °C gave similar textural quality and storage stability with commercial product until week 8 and 12, respectively
3. Storage temperature had the most significant effects on quality changes of natural peanut butter
4. Natural peanut butter stored at 25 and 35 °C can be consumed within 48 h without major sensory concern
5. Satisfaction of quality attributes are different among storage temperature
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Mohd Rozalli, N.H., Chin, N.L., Yusof, Y.A. et al. Quality changes of stabilizer-free natural peanut butter during storage. J Food Sci Technol 53, 694–702 (2016). https://doi.org/10.1007/s13197-015-2006-x
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DOI: https://doi.org/10.1007/s13197-015-2006-x