Effect of addition of cryoprotectants on the mechanical properties, colour and sensory attributes of fresh and frozen/thawed mashed potatoes |
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Authors: | M D Alvarez W Canet C Fernández |
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Affiliation: | (1) Department of Plant Foods Science and Technology, Instituto del Frío-CSIC, José de Novaís no.10, 28040 Madrid, Spain |
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Abstract: | Cryoprotectants such as hydrocolloids (amidated low-methoxyl (ALM) and high methoxyl (HM) pectins), kappa- and iota-carrageenans
(k-C and i-C), xanthan gum (XG)) and dairy proteins whey protein (WP), sodium caseinate (SC)] were added to mashed potatoes to investigate
ways of improving the effects of freezing and thawing. It was found that each hydrocolloid and protein, depending on concentration,
affected the mechanical properties instrumental textural profile analysis (ITPA), cone penetration (CP) test], the total
colour difference (ΔE*) with respect to fresh control (FC) and the sensory attributes of fresh (F) and frozen/thawed (F/T) mashed potatoes in a
different way. In the F/T samples, adding 5 and 8 g kg−1 ALM, 3, 5 and 8 g kg−1
k-C, 1.5, 3, 5 and 8 g kg−1
i-C and 1.5, 5 and 15 g kg−1 WP significantly increased ITPA consistency. Also, adding 2.5 and 5 g kg−1 XG significantly increased ITPA consistency of the F/T product. In both F and F/T samples, k-C provided the highest ITPA consistency and also high CP average force evidencing a stronger synergistic effect in κ-C/denatured milk protein systems, although the excessive thickening and stickiness provided was judged undesirable by the
panellists. Adding 8 g kg−1 HM pectin had a disruptive effect on the mashed potatoes and decreased both ITPA consistency and CP average force. In all
cases, freezing and thawing reinforced the gel structure of the products as compared to F and FC counterparts. The ΔE* values were higher in F samples containing ALM and HM pectins. Dairy proteins affected the taste and odour of the mashed
potatoes and were judged unacceptable in the sensory analysis. Samples containing 0.5 and 1.5 g kg−1 added XG were preferred organoleptically due to the creamy mouthfeel it produced. ITPA consistency correlated well with sensory
texture attributes. |
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Keywords: | Mechanical properties Mashed potatoes Cryoprotectants Freezing Thawing Sensory analysis |
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