Enzymatically hydrolysed, acetylated and dually modified corn starch: physico-chemical, rheological and nutritional properties and effects on cake quality

Evaluating the effects of time-dependent drying and pressure heat treatments on the variation of physicochemical and rheological properties of suran starch

Recent research developments have shed light on hydrothermal treatment as a commonly employed method for physical modifications. Surprisingly, there is a scarcity of studies investigating the impact of time variation which is a critical process parameter. Therefore, it is important to closely monitor the critical process parameters throughout the process. Hence, the present study investigates the influence of time-dependent hydrothermal modifications like dry heat (DH) and pressure heat (AT) on Suran starch, focusing on the physicochemical and rheological properties. Over time, the modified starches showed increased swelling and solubility power due to intermolecular hydrogen bond disruption. Prolonged heat exposure made starch granules more susceptible to water absorption, enhancing their swelling capacity. Rheological analysis revealed time-dependent shear-thinning behaviour, with modified starches showing improved resistance to shear stress compared to native starch. Extended heat treatment led to structural rearrangements in starch granules, resulting in increased entanglement and higher viscosity, contributing to improved mechanical properties. Interestingly, the AT-25 starch sample exhibited the highest elasticity, indicating enhanced structural rigidity under high shear conditions. The time-dependent alterations due to pressure treatments improved the functionalities and structural integrity of modified Suran starch. These findings highlight the positive impact of time-dependent heat treatment modifications on Suran starch, making it a valuable resource for various industrial applications. Enhancing the industrial viability of underutilized Suran starch could contribute significantly to meeting the demand for starch in various industries.

Rheological and technological characterization of red rice modified starch and jaboticaba peel powder mixtures

Properties of modified starch and its interaction with functional raw materials are of great interest to the food industry. Thus, this study aimed to evaluate the rheological and technological characterization of starches modified by the action of the enzymes α-amylase and amyloglucosidase and their mixtures with jaboticaba peel powder. The parameters of firmness, gumminess, and final viscosity of starches paste increased, and the tendency to setback was reduced with the addition of jaboticaba peel powder. Starches and mixtures presented shear-thinning behavior. The addition of jaboticaba peel powder to starches increased water, oil, and milk absorption capacity, while syneresis remained stable over the storage period. The addition of jaboticaba peel powder had a positive effect on native and modified starches' rheological and technological properties, qualifying it as an alternative for developing new functional food products.

Effect of acetylated starch on the development of peanut skin-cassava starch foams

Cassava starch was modified by acetylation to obtain modified starches with a degree of substitution (DS) of 0.5 and 1.5. The acetylated cassava starches presented a reduction in temperature gelatinization and enthalpy, water solubility, and power swelling, in addition to a loss of crystallinity compared to native cassava starches. Acetylated cassava starch was used to the development of foams based on native cassava starch, 24% (w/w) of peanut skin, and 13% (w/w) of glycerol. It was used blends of native cassava starch and acetylated cassava starch with ratios of 100/0, 90/10, 80/20, 70/30, and 60/40. The foams containing acetylated cassava starch with DS = 0.5 exhibited a reduction in water absorption capacity (WAC) for water contact time of 30 min. Foams containing acetylated cassava starch with DS = 1.5 did not show a significant difference in WAC compared to foams made using only native cassava starch. The use of 30% (w/w) of acetylated cassava starch, independently of DS (0.5 or 1.5), resulted in faster degradation of foams than those without modified starches.

Dual modification of various starches: Synthesis, properties and applications

The problems associated with native starches (NSs) and single modified starches were stated in order to justify dual modification of various starches. Broadly, there are two types of dual modification, i.e., homogeneous dual modification and heterogeneous dual modification. The combination of two physical modifications, e.g., (extrusion/annealing); two chemical modifications, e.g., (succinylation/cross-linking) and two enzymes modification (α-amylase/pullulanase) falls under the former classification and the latter classification is the combination of two of each of the differently stated modifications, e.g., acetylation/annealing, extrusion/succinylation, and microwave-assisted phosphorylation, etc. The classification, synthesis, properties and applications of dually modified starches were discussed. There is an attempt to elucidate the problems of each of the single modification in order to justify dual modifications. In dual modifications, the order of reactions, the reaction conditions, the medium of reaction, and the botanical sources of the various starches are very important parameters.