Speciality plastic fats with no trans fatty acids suitable for use in bakery and as vanaspati substitute were prepared by interesterification of blends of palm stearin (PSt) with sal and mango fats using Lipozyme TLIM lipase as catalyst. The blends containing PSt/sal or PSt/mango showed short melting range and hence are not suitable as bakery shortenings. Lipase catalysed interesterification extended the plasticity or melting range of all the blends. The blends containing higher proportion of PSt with sal fat (50/50) were harder having high solids at and above body temperature and hence cannot be used as bakery shortenings. The blends with PSt/sal (30-40/60-70) after interesterification showed melting profiles similar to those of commercial hydrogenated bakery fats. Similarly, the blends containing PSt/mango (30-40/60-70) after interesterification also showed melting profiles similar to those of commercial hydrogenated shortenings. The slip melting point and solidification characteristics also confirm the plastic nature of these samples. The improvement in plasticity after interesterification is due to formation of higher melting as well as lower melting triglycerides during lipase catalysed interesterification.
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| http://dx.doi.org/10.1007/s13197-011-0492-z | DOI Listing |
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