Details

Autor(en) / Beteiligte

• Jana, Sarbojeet
• Martini, Silvana

Titel

Physical characterization of crystalline networks formed by binary blends of waxes in soybean oil

Ist Teil von

• Food research international, 2016-11, Vol.89 (Pt 1), p.245-253

Ort / Verlag

Canada: Elsevier Ltd

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The objective of this study is to analyze the physical properties of 2.5% (wt. basis) binary wax in soybean oil (SBO) system. Differential scanning calorimetry, pulsed nuclear magnetic resonance, rheology, and polarized light microscopy were used to measure melting profiles, solid fat content, viscoelastic parameters, and crystal morphology, respectively. Binary blends were prepared using beeswax (BW), rice bran wax (RBW), and sunflower wax (SFW) in 0, 20, 50, 80 and 100% proportions. Melting behavior of binary waxes was significantly affected by the type and proportion of wax used. Melting Ton and Tp for RBW/SFW and RBW/BW blends were significantly higher than those observed for SFW/BW. Enthalpy values suggest that different molecules present in the wax affect intermolecular interactions in the binary blends by either inducing (SFW/BW) or delaying (RBW/BW) crystallization. Iso-solid diagrams show that there is certainly a softening effect when different proportions of RBW/BW and SFW/BW are used, while a solid solution is formed in RBW/SFW systems. Viscoelastic parameters (G′, G″) results show that RBW has the highest G′ value (3.1×104±1×103Pa) followed by SFW (2.7×104±0.2×104Pa) and BW having the lowest (90.7±74.4Pa). Higher G′ values in all proportions of RBW/SFW binary system in SBO indicate significantly more solid-like behavior than any other combinations. However, blending of two different waxes does not necessary result in a linear increase in elastic properties and in some cases no changes in elasticity is observed as the amount of the high melting wax is added to the low melting one. Melting enthalpy (A), elastic modulus (B), and isosolid diagrams (C) of binary blends of waxes in soybean oil. ΔH: melting enthalpy; G′: Elastic modulus, SBO: Soybean oil, SFW: Sunflower wax, BW: Beeswax, and RBW: Ricebran wax. Bars in panels A and B with the same letter indicate that values are not significantly different (α=0.05). Percentages shown in panel C correspond to solid fat content values. [Display omitted] •Blending of natural waxes can be used as an additional tool to tailor physical properties of wax/oil systems.•An inhibition of crystallization is observed when RBW is mixed with BW compared to the theoretical values expected.•Blending of two different waxes does not necessary result in a change in elastic properties.•Iso-solid diagrams show a softening effect when different proportions of RBW/BW and SFW/BW are used.