scholarly journals Viscoelastic and Textural Characteristics of Gels Obtained from Potato Starch Roasted under Several Temperature-Time Conditions

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
María D. Torres ◽  
Francisco Chenlo ◽  
Ramón Moreira
Keyword(s):  
Soluble Fraction ◽  
Profile Analysis ◽  
Amylose Content ◽  
Potato Starch ◽  
Degree Of Crystallinity ◽  
Texture Profile ◽  
Gel Texture ◽  
Apparent Amylose Content ◽  
Textural Parameters ◽  
Roasting Temperature

The influence of roasting conditions on the potato starch (PS) composition, solubility, crystallinity, gel-forming thermal profiles, and texture of the corresponding gels was studied. Thermorheological testing of roasted starches with (RPS) and without (RPSI) the soluble fraction was conducted on a stress-controlled rheometer. Texture profile analysis (TPA) was used to determine the RPS final gel texture. Solubility tests showed equivalent effects of starch roasting for samples treated at 190°C for 8 h (RPS190-8), 210°C for 6 h (RPS210-6), and 230°C for 4 h (RPS230-4). The apparent amylose content of RPS linearly increased with the decreasing degree of crystallinity. Elastic (G′) and viscous (G″) properties of RPS depended markedly on apparent amylose content and crystallinity. G′gel values of roasted starches linearly increased with the amylose content suggesting a promotion of the amylose breakdown with roasting temperature. Gels prepared with RPS roasted between 120 and 170°C exhibited intermediate strength and fully thermal reversible features. Roasting between 190 and 210°C favoured strong and fully thermal reversible gels. Although RPS230-4 gels exhibited similar strength to RPS190-8 and RPS210-4, no fully thermal reversible gels were obtained. The soluble fraction removal led to a drop the RPSI gels strength with increasing roasting temperature. No water syneresis was identified for RPS gels during one-week ageing, except for RPS230 gels. Relationships between textural parameters from TPA and viscoelastic gel properties determined by rheology were established.

scholarly journals Effect of addition of starches of different botanical origin on the texture and rheological properties of set-style yogurts

2007 ◽  
Vol 23 (5-6-2) ◽  
pp. 95-102 ◽  
Author(s):  
D. Najgebauer-Lejko ◽  
M. Sady ◽  
T. Grega ◽  
B. Faber ◽  
J. Domagała ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Profile Analysis ◽  
Potato Starch ◽  
Botanical Origin ◽  
Maize Starch ◽  
Flow Curves ◽  
Series Introduction ◽  
Texture Profile ◽  
Waxy Maize ◽  
Textural Parameters

The aim of the present study was to estimate an effect of addition of different native starches i.e.: potato, maize, waxy maize and tapioca on the textural (Texture Profile Analysis) and rheological properties (apparent dynamic viscosity, flow curves) of set-style cow?s yogurts. All analyses were done on fresh yogurts and after 1 and 3 weeks of storage at 4?C in three series. Introduction of all starches to the yogurt formula resulted in higher viscosity and improvement of all textural parameters except hardness. Addition of maize starch caused the highest apparent viscosity value and waxy maize starch supplementation led to the lowest hardness. Also the shape of flow curves was highly affected by the kind of starch added to the processing milk. Generally, maize and waxy maize starch additives resulted in higher values of shear stress when compared to the plain yogurt, whereas yogurt supplemented with potato starch demonstrated lower values of that parameter.

scholarly journals Physicochemical Properties of C-Type Starch from Root Tuber of Apios fortunei in Comparison with Maize, Potato, and Pea Starches

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2132 ◽  
Author(s):  
Juan Wang ◽  
Ke Guo ◽  
Xiaoxu Fan ◽  
Gongneng Feng ◽  
Cunxu Wei
Keyword(s):  
Physicochemical Properties ◽  
Water Solubility ◽  
Amylose Content ◽  
Potato Starch ◽  
Hierarchical Cluster ◽  
Lamellar Thickness ◽  
Relative Crystallinity ◽  
Apparent Amylose Content ◽  
Root Tuber ◽  
Gelatinized Starch

The dry root tuber of Apios fortunei contained about 75% starch, indicating that it is an important starch resource. Starch displayed spherical, polygonal, and ellipsoidal granules with central hila. Granule sizes ranged from 3 to 30 μm with a 9.6 μm volume-weighted mean diameter. The starch had 35% apparent amylose content and exhibited CA-type crystalline structure with 25.9% relative crystallinity. The short-range ordered degree in the granule external region was approximately 0.65, and the lamellar thickness was approximately 9.6 nm. The swelling power and water solubility began to increase from 70 °C and reached 28.7 g/g and 10.8% at 95 °C. Starch had typical bimodal thermal curve in water with gelatinization temperatures from 61.8 to 83.9 °C. The 7% (w/w) starch-water slurry had peak, hot, breakdown, final, and setback viscosities of 1689, 1420, 269, 2103, and 683 mPa s, respectively. Rapidly digestible starch, slowly digestible starch, and resistant starch were 6.04%, 10.96%, and 83.00% in native starch; 83.16%, 15.23%, and 1.61% in gelatinized starch; and 78.13%, 17.88%, and 3.99% in retrograded starch, respectively. The above physicochemical properties of A. fortunei starch were compared with those of maize A-type starch, potato B-type starch, and pea C-type starch. The hierarchical cluster analysis based on starch structural and functional property parameters showed that A. fortunei and pea starches had similar physicochemical properties and were more related to maize starch than potato starch.

scholarly journals Moisture Effect on Characteristics of Slowly Digestible Potato Starch Prepared under Electron Beam Irradiation

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Vinh Tien Nguyen ◽  
Loc Nguyen Thi ◽  
Khanh Son Trinh
Keyword(s):  
Electron Beam ◽  
Amylose Content ◽  
Potato Starch ◽  
Average Molecular Weight ◽  
Degree Of Crystallinity ◽  
In Vitro Digestibility ◽  
Moisture Contents ◽  
Physicochemical Changes

This study evaluates the effect of initial moisture contents (11.74–29.84%) on physicochemical changes, in vitro and in vivo digestibilities of potato starch irradiated with electron beam (EB). After a constant dose of EB irradiation, intrinsic viscosity and average molecular weight of potato starch decreased for all investigated moisture contents. When the moisture of starch was lower than 18%, the depolymerization predominated, hence increasing the amylose content. At higher moisture, water can strongly absorb EB and produce highly active species that induced the crosslinking of amylose molecules and the disruption of large crystals into smaller defective crystals. As a result, we found a maximum in amylose content at 14.84% moisture and a minimum in the degree of crystallinity at 17.5% moisture. Thermal stabilities between the irradiated samples were not significantly different. In vitro digestibility results showed that higher moistures during EB treatment induced structural changes that led to the conversion of resistant starch (RS) fraction into slowly digestible starch (SDS). Moreover, an in vivo digestive model in mice showed that EB-treated starch was able to maintain blood glucose at a stable level for a long time. This study showed a potential for SDS production from potato starch using EB irradiation technology, even in large scale.

scholarly journals Grain Quality and Starch Physicochemical Properties of Chalky Rice Mutant

Agronomy ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1575
Author(s):  
Chu-Xin Wang ◽  
Cheng-Chao Zhu ◽  
Chen-Ya Lu ◽  
Yong Yang ◽  
Qian-Feng Li ◽  
...  
Keyword(s):  
Transcription Factor ◽  
Grain Quality ◽  
Profile Analysis ◽  
Amylose Content ◽  
Rice Grain ◽  
Wild Type ◽  
Rice Endosperm ◽  
Rice Mutant ◽  
Apparent Amylose Content ◽  
Quality Profile

Rice mutants with altered starch components and properties are important genetic resources for grain quality and starch structure analysis. Accordingly, in the present study, two mutants of the transcription factor OsbZIP09 were generated (osbzip09a and osbzip09b), and the rice grain quality and physicochemical starch properties of the mutant and wild-type lines were compared. The OsbZIP09 mutants exhibit a chalky grain owing to loosely packed, small, spherical starch granules in the ventral region of the endosperm. Furthermore, grain-quality profile analysis showed that OsbZIP09 deficiency leads to increased apparent amylose content but decreased gel consistency. Structural analysis of the mutant starches revealed that the mutant rice lines contain more amylopectin short chains and fewer intermediate chains, leading to lower crystallinity and lower gelatinization properties than those of the wild-type rice. Moreover, the OsbZIP09 mutants rice presented a significantly higher pasting curve and corresponding parameters than the wild-type rice. The results from this work strongly indicate that the transcription factor OsbZIP09 plays an important role in rice grain quality and starch fine structure modification, and extend our understanding of starch biosynthesis in rice endosperm.

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