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1.
Food Chem ; 462: 140974, 2025 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-39197239

RESUMO

Total starch granule-associated proteins (tGAP), including granule-channel (GCP) and granule-surface proteins (GSP), alter the physicochemical properties of starches. Quinoa starch (QS) acts as an effective emulsifier in Pickering emulsion. However, the correlation between the tGAP and the emulsifying capacity of QS at different scales remains unclear. Herein, GCP and tGAP were selectively removed from QS, namely QS-C and QS-A. Results indicated that the loss of tGAP increased the water permeability and hydrophilicity of the starch particles. Mesoscopically, removing tGAP decreased the diffusion rate and interfacial viscous modulus. Particularly, GSP had a more profound impact on the interfacial modulus than GCP. Microscopically and macroscopically, the loss of tGAP endowed QS with weakened emulsifying ability in terms of emulsions with larger droplet size and diminished rheological properties. Collectively, this work demonstrated that tGAP played an important role in the structural and interfacial properties of QS molecules and the stability of QS-stabilized emulsions.


Assuntos
Chenopodium quinoa , Emulsificantes , Emulsões , Interações Hidrofóbicas e Hidrofílicas , Proteínas de Plantas , Amido , Chenopodium quinoa/química , Amido/química , Emulsões/química , Emulsificantes/química , Proteínas de Plantas/química , Tamanho da Partícula , Reologia
2.
Food Chem ; 462: 140992, 2025 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-39208723

RESUMO

The development and manufacture of high-quality starch are a new research focus in food science. Here, transglutaminase was used in the wet processing of glutinous rice flour to prepare customized sweet dumplings. Transglutaminase (0.2 %) lowered protein loss in wet processing and reduced the crystallinity and viscosity of glutinous rice flour. Moreover, it lowered the cracking and cooking loss of sweet dumplings after freeze-thaw cycles, and produced sweet dumplings with reduced hardness and viscosity, making them more suitable for people with swallowing difficulties. Additionally, in sweet dumplings with 0.2 % transglutaminase, the encapsulation of starch granules by the protein slowed down the digestion and reduced the final hydrolysis rate, which are beneficial for people with weight and glycemic control issues. In conclusion, this study contributes to the production of tasty, customized sweet dumplings.


Assuntos
Digestão , Farinha , Oryza , Amido , Transglutaminases , Oryza/química , Oryza/metabolismo , Transglutaminases/metabolismo , Transglutaminases/química , Farinha/análise , Amido/química , Amido/metabolismo , Manipulação de Alimentos , Humanos , Viscosidade , Culinária , Proteínas de Bactérias/metabolismo , Proteínas de Bactérias/química , Biocatálise
3.
Food Chem ; 462: 140949, 2025 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-39213976

RESUMO

Hydrogels based on natural polymers have aroused interest from the scientific community. The aim of this investigation was to obtain natural extracts from mango peels and to evaluate their addition (1, 3, and 5%) on the rheological behavior of mango starch hydrogels. The total phenolic content, antioxidant activities, and phenolic acid profile of the natural extracts were evaluated. The viscoelastic and thixotropic behavior of hydrogels with the addition of natural extracts was evaluated. The total phenol content and antioxidant activity of the extracts increased significantly (p<0.05) with the variation of the ethanol-water ratio; the phenolic acid profile showed the contain of p-coumaric, ellagic, ferulic, chlorogenic acids, epicatechein, catechin, querecetin, and mangiferin. The viscoelastic behavior of the hydrogels showed that the storage modulus G' is larger than the loss modulus G'' indicating a viscoelastic solid behavior. The addition of extract improved the thermal stability of the hydrogels. 1% of the extracts increase viscoelastic and thixotropic properties, while concentrations of 3 to 5% decreased. The recovery percentage (%Re) decreases at concentrations from 0% to 1% of natural extracts, however, at concentrations from 3% to 5% increased.


Assuntos
Antioxidantes , Hidrogéis , Mangifera , Extratos Vegetais , Reologia , Amido , Mangifera/química , Hidrogéis/química , Extratos Vegetais/química , Amido/química , Antioxidantes/química , Viscosidade , Frutas/química , Fenóis/química
4.
Food Chem ; 462: 140987, 2025 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-39217748

RESUMO

This study aimed to investigate the textural changes of cooked germinated brown rice (GBR) during freeze-thaw treatment and propose a strategy for enhancing its texture using magnetic field (MF). Seven freeze-thaw cycles exhibited more pronounced effects compared to 7 days of freezing, resulting in increases in GBR hardness by 85.59 %-164.36 % and decreases in stickiness by 10.34 %-43.55 %. Water loss, structural damage of GBR flour, and starch retrogradation contributed to the deterioration of texture. MF mitigated these effects by inhibiting the transformation of bound water into free water, reducing water loss by 0.39 %-0.57 %, and shortening the phase transition period by 2.0-21.5 min, thereby diminishing structural damage to GBR flour and hindering starch retrogradation. Following MF treatment (5 mT), GBR hardness decreased by 21.00 %, while stickiness increased by 45.71 %. This study elucidates the mechanisms through which MF enhances the texture, offering theoretical insights for the industrial production of high-quality frozen rice products.


Assuntos
Culinária , Congelamento , Germinação , Campos Magnéticos , Oryza , Oryza/química , Oryza/crescimento & desenvolvimento , Oryza/metabolismo , Farinha/análise , Amido/química , Amido/metabolismo , Água/química , Dureza , Manipulação de Alimentos , Sementes/química , Sementes/crescimento & desenvolvimento
5.
Food Chem ; 462: 140847, 2025 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-39226647

RESUMO

Effects of varying degree of milling (DOM) (0-22%) on the bran layer structure, physicochemical properties, and cooking quality of brown rice were explored. As the DOM increased, bran degree, protein, lipid, dietary fiber, amylose, mineral elements, and color parameters (a* and b* values) of milled rice decreased while starch and L* value increased. Microscopic fluorescence images showed that the pericarp, combined seed coat-nucellus layer, and aleurone layer were removed in rice processed at DOM of 6.6%, 9.2%, and 15.4%, respectively. The pasting properties, thermal properties, and palatability of rice increased as the DOM increased. Principal component and correlation analysis indicated that excessive milling lead to a decline in nutritional value of rice with limited impact on enhancing palatability. Notably, when parts of aleurone cell wall were retained, rice samples exhibited high cooking and sensory properties. It serves as a potential guide to the production of moderately milled rice.


Assuntos
Culinária , Fibras na Dieta , Oryza , Sementes , Oryza/química , Fibras na Dieta/análise , Sementes/química , Valor Nutritivo , Paladar , Humanos , Manipulação de Alimentos , Amido/química , Amilose/química , Amilose/análise
6.
Food Chem ; 462: 140993, 2025 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-39197246

RESUMO

To improve paste stability of cassava starch, including acid resistance, high-temperature shear resistance and freeze-thaw stability, cassava starch was modified by sequential maltogenic amylase and transglucosidase to form an optimally denser structure, or branched density (12.76 %), molecular density (15.17 g/mol/nm3), and the proportions of short-branched chains (41.41 % of A chains and 44.01 % of B1 chains). Viscosity stability (88.52 %) of modified starch was higher than that (64.92 %) of native starch. After acidic treatment for 1 h, the viscosity of modified starch and native starch decreased by 56.53 % and 65.70 %, respectively. Compared to native starch, modified starch had lower water loss in freeze-thaw cycles and less viscosity reduction during high-temperature and high-shear processing. So, the appropriate molecular density and denser molecule structure enhanced paste stabilities of modified starch. The outcome expands the food and non-food applications of cassava starch.


Assuntos
Manihot , Amido , Amido/química , Manihot/química , Viscosidade , Glicosídeo Hidrolases/química , Glicosídeo Hidrolases/metabolismo , Temperatura Alta , Glucosiltransferases/química , Glucosiltransferases/metabolismo
7.
Nutrients ; 16(17)2024 Aug 23.
Artigo em Inglês | MEDLINE | ID: mdl-39275130

RESUMO

Amino acid (AA)-related inherited metabolic disorders (IMDs) and urea cycle disorders (UCDs) require strict dietary management including foods low in protein such as fruits, vegetables and starchy roots. Despite this recommendation, there are limited data on the AA content of many of these foods. The aim of this study is to describe an analysis of the protein and AA content of a range of fruits, vegetables and starchy roots, specifically focusing on amino acids (AAs) relevant to AA-related IMDs such as phenylalanine (Phe), methionine (Met), leucine (Leu), lysine (Lys) and tyrosine (Tyr). AA analysis was performed using high-performance liquid chromatography (HPLC) on 165 food samples. Protein analysis was also carried out using the Dumas method. Foods were classified as either 'Fruits', 'Dried fruits', 'Cruciferous vegetables', 'Legumes', 'Other vegetables' or 'Starchy roots'. 'Dried fruits' and 'Legumes' had the highest median values of protein, while 'Fruits' and 'Cruciferous vegetables' contained the lowest median results. 'Legumes' contained the highest and 'Fruits' had the lowest median values for all five AAs. Variations were seen in AA content for individual foods. The results presented in this study provide useful data on the protein and AA content of fruits, vegetables and starchy roots which can be used in clinical practice. This further expansion of the current literature will help to improve diet quality and metabolic control among individuals with AA-related IMDs and UCDs.


Assuntos
Aminoácidos , Proteínas Alimentares , Frutas , Raízes de Plantas , Amido , Verduras , Verduras/química , Frutas/química , Raízes de Plantas/química , Aminoácidos/análise , Proteínas Alimentares/análise , Amido/análise , Humanos , Doenças Metabólicas , Cromatografia Líquida de Alta Pressão/métodos , Valor Nutritivo
8.
Nutrients ; 16(17)2024 Sep 09.
Artigo em Inglês | MEDLINE | ID: mdl-39275354

RESUMO

A diet with low content of fermentable oligo-, di-, and monosaccharides and polyols (FODMAP) is established treatment for irritable bowel syndrome (IBS), with well-documented efficiency. A starch- and sucrose-reduced diet (SSRD) has shown similar promising effects. The primary aim of this randomized, non-inferiority study was to test SSRD against low FODMAP and compare the responder rates (RR = ∆Total IBS-SSS ≥ -50) to a 4-week dietary intervention of either diet. Secondary aims were to estimate responders of ≥100 score and 50% reduction; effects on extraintestinal symptoms; saturation; sugar craving; anthropometric parameters; and blood pressure. 155 IBS patients were randomized to SSRD (n = 77) or low FODMAP (n = 78) for 4 weeks, with a follow-up 5 months later without food restrictions. The questionnaires Rome IV, IBS-severity scoring system (IBS-SSS), and visual analog scale for IBS (VAS-IBS) were completed at baseline and after 2 and 4 weeks and 6 months. Weight, height, waist circumference, and blood pressures were measured. Comparisons were made within the groups and between changes in the two groups. There were no differences between groups at baseline. The responder rate of SSRD was non-inferior compared with low FODMAPs at week 2 (79.2% vs. 73.1%; p = 0.661;95% confidence interval (CI) = -20-7.2) and week 4 (79.2% vs. 78.2%; p = 1.000;95%CI = -14-12). Responder rate was still high when defined stricter. All gastrointestinal and extraintestinal symptoms were equally improved (p < 0.001 in most variables). SSRD rendered greater reductions in weight (p = 0.006), body mass index (BMI) (p = 0.005), and sugar craving (p = 0.05), whereas waist circumference and blood pressure were equally decreased. Weight and BMI were regained at follow-up. In the SSRD group, responders at 6 months still had lowered weight (-0.7 (-2.5-0.1) vs. 0.2 (-0.7-2.2) kg; p = 0.005) and BMI (-0.25 (-0.85-0.03) vs. 0.07 (-0.35-0.77) kg/m2; p = 0.009) compared with baseline in contrast to non-responders. Those who had tested both diets preferred SSRD (p = 0.032). In conclusion, a 4-week SSRD intervention was non-inferior to low FODMAP regarding responder rates of gastrointestinal IBS symptoms. Furthermore, strong reductions of extraintestinal symptoms were found in both groups, whereas reductions in weight, BMI, and sugar craving were most pronounced following SSRD.


Assuntos
Síndrome do Intestino Irritável , Amido , Humanos , Síndrome do Intestino Irritável/dietoterapia , Feminino , Masculino , Adulto , Pessoa de Meia-Idade , Amido/administração & dosagem , Resultado do Tratamento , Fermentação , Polímeros , Monossacarídeos , Dieta com Restrição de Carboidratos/métodos , Sacarose Alimentar/administração & dosagem , Oligossacarídeos , Dissacarídeos/administração & dosagem , Pressão Sanguínea
9.
Food Res Int ; 195: 114957, 2024 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-39277262

RESUMO

To reveal the effect of wheat flour particle size on the quality deterioration of quick-frozen dumpling wrappers (QFDW) during freeze-thawed (F/T) cycles, the components and physicochemical properties of wheat flours with five different particle sizes were determined and compared, along with the changes in texture and sensory properties, water status, and microstructure of QFDW during F/T cycles. Results showed that as particle size decreased, the damaged starch content and B-type starch content increased, the water absorption increased, and the gluten strength decreased. Furthermore, F/T cycles negatively impacted the quality of QFDW, evidenced by decreased texture properties and sensory evaluation score, water redistribution, higher freezable water content, and disruption of gluten network. Notably, QFDW made from larger particle size wheat flours required the shortest duration when traversing the maximum ice crystal formation zone. The QFDW made from larger particle size wheat flours formed a more stable starch-gluten matrix, which resisted the damage caused by ice recrystallization, demonstrating better water binding capacity and F/T resistance. The results may provide theoretical guidance for the study of QFDW quality and the moderate processing of wheat flour in actual production.


Assuntos
Farinha , Manipulação de Alimentos , Congelamento , Glutens , Tamanho da Partícula , Amido , Triticum , Água , Farinha/análise , Triticum/química , Amido/química , Amido/análise , Manipulação de Alimentos/métodos , Água/química , Glutens/análise , Glutens/química , Humanos
10.
Int J Mol Sci ; 25(17)2024 Aug 26.
Artigo em Inglês | MEDLINE | ID: mdl-39273191

RESUMO

Starch is the main component that determines the yield and quality of Tartary buckwheat. As a quantitative trait, using quantitative trait locus (QTL) mapping to excavate genes associated with starch-related traits is crucial for understanding the genetic mechanisms involved in starch synthesis and molecular breeding of Tartary buckwheat varieties with high-quality starch. Employing a recombinant inbred line population as research material, this study used QTL mapping to investigate the amylose, amylopectin, and total starch contents across four distinct environments. The results identified a total of 20 QTLs spanning six chromosomes, which explained 4.07% to 14.41% of the phenotypic variation. One major QTL cluster containing three stable QTLs governing both amylose and amylopectin content, qClu-4-1, was identified and located in the physical interval of 39.85-43.34 Mbp on chromosome Ft4. Within this cluster, we predicted 239 candidate genes and analyzed their SNP/InDel mutations, expression patterns, and enriched KEGG pathways. Ultimately, five key candidate genes, namely FtPinG0004897100.01, FtPinG0002636200.01, FtPinG0009329200.01, FtPinG0007371600.01, and FtPinG0005109900.01, were highlighted, which are potentially involved in starch synthesis and regulation, paving the way for further investigative studies. This study, for the first time, utilized QTL mapping to detect major QTLs controlling amylose, amylopectin, and total starch contents in Tartary buckwheat. The QTLs and candidate genes would provide valuable insights into the genetic mechanisms underlying starch synthesis and improving starch-related traits of Tartary buckwheat.


Assuntos
Mapeamento Cromossômico , Fagopyrum , Locos de Características Quantitativas , Amido , Fagopyrum/genética , Fagopyrum/metabolismo , Amido/genética , Amido/metabolismo , Polimorfismo de Nucleotídeo Único , Fenótipo , Amilose/metabolismo , Amilose/genética , Cromossomos de Plantas/genética , Regulação da Expressão Gênica de Plantas , Amilopectina/metabolismo , Amilopectina/genética , Genes de Plantas
11.
Int J Mol Sci ; 25(17)2024 Aug 27.
Artigo em Inglês | MEDLINE | ID: mdl-39273232

RESUMO

Foxtail millet is one of the oldest crops, and its endosperm contains up to 70% of starch. Grain filling is an important starch accumulation process associated with foxtail millet yield and quality. However, the molecular mechanisms of grain filling in foxtail millet are relatively unclear. Here, we investigate the genes and regulated miRNAs associated with starch synthesis and metabolism in foxtail millet using high-throughput small RNA, mRNA and degradome sequencing. The regulation of starch synthesis and quality is carried out mainly at the 15 DAA to 35 DAA stage during grain filling. The DEGs between waxy and non-waxy foxtail millet were significant, especially for GBSS. Additionally, ptc-miR169i_R+2_1ss21GA, fve-miR396e_L-1R+1, mtr-miR162 and PC-5p-221_23413 regulate the expression of genes associated with the starch synthesis pathway in foxtail millet. This study provides new insights into the molecular mechanisms of starch synthesis and quality formation in foxtail millet.


Assuntos
Endosperma , Regulação da Expressão Gênica de Plantas , MicroRNAs , Setaria (Planta) , Amido , MicroRNAs/genética , Setaria (Planta)/genética , Setaria (Planta)/metabolismo , Setaria (Planta)/crescimento & desenvolvimento , Amido/biossíntese , Endosperma/genética , Endosperma/metabolismo , Genoma de Planta , Perfilação da Expressão Gênica/métodos , RNA de Plantas/genética , RNA de Plantas/biossíntese
12.
Carbohydr Polym ; 344: 122525, 2024 Nov 15.
Artigo em Inglês | MEDLINE | ID: mdl-39218548

RESUMO

Starch is a primary source of food energy for human beings. Its chain-length distribution (CLD) is a major structural feature influencing physiologically-important properties, such as digestibility and palatability, of starch-containing foods. Diabetes, which is of epidemic proportions in many countries, is related to the rate of starch digestion in foods. Isoforms of three biosynthesis enzymes, starch synthase, starch branching enzymes and debranching enzymes, control the CLDs of starch, which can be measured by methods such as size-exclusion chromatography and fluorophore-assisted carbohydrate electrophoresis. Fitting observed CLDs to biosynthesis-based models based on the ratios of the activities of those isoforms yields biosynthesis-related parameters describing CLD features. This review examines CLD measurement, fitting CLDs to models, relations between CLDs, the occurrence and management of diabetes, and how plant breeders can develop varieties to optimize digestibility and palatability together, to develop starch-based foods with both a lower risk of diabetes and acceptable taste.


Assuntos
Diabetes Mellitus , Amido , Amido/química , Amido/metabolismo , Humanos , Diabetes Mellitus/metabolismo , Sintase do Amido/metabolismo , Digestão , Estrutura Molecular , Animais
13.
Carbohydr Res ; 544: 109248, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-39222593

RESUMO

This study aimed at optimizing process protocols for development of low glycemic index (GI) rice flour (LGIRF) by employing enzymatic hydrolysis method using central composite rotatable design (CCRD). LGIRF was evaluated for pasting, farinographic, spectroscopic and microbiological attributes. Independent variables for optimization included concentrations of α-amylase (0.02-0.12 %), glucoamylase (0.02-0.24 %), as well as the incubation temperature (55-80°C). Resistant starch (RS), glycemic index (GI) and glycemic load (GL) were investigated as response variables. The optimum conditions for development of LGIRF with better quality were- α-amylase concentration of 0.040 %, glucoamylase concentration of 0.070 % and an incubation temperature of 60 °C. The results of mineral analysis revealed significantly (p < 0.05) lower levels of boron, potassium, zinc, phosphorus, magnesium, and manganese in LGIRF, while iron and copper were significantly higher. The viscosity profile as evident from pasting profile and farinographic characteristics of LGIRF were significantly (p < 0.05) lower than native rice flour. 1H NMR and 13C NMR spectroscopic studies showed an increase in flexible starch segments and a decrease in amorphous portion of starch LGIRF, along with chemical shift alterations in carbons 1 and 4. Free fatty acids and total plate count were significantly (p < 0.05) higher in LGIRF although was within limits.


Assuntos
Farinha , Glucana 1,4-alfa-Glucosidase , Índice Glicêmico , Oryza , Reologia , alfa-Amilases , Oryza/química , Hidrólise , Farinha/análise , alfa-Amilases/metabolismo , alfa-Amilases/química , Glucana 1,4-alfa-Glucosidase/metabolismo , Glucana 1,4-alfa-Glucosidase/química , Amido/química , Amido/metabolismo
14.
Food Res Int ; 194: 114869, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-39232508

RESUMO

Genistein could interact with starch to slow starch digestion by forming starch-genistein complexes. However, genistein had low solubility in water, which hindered the interaction with starch and therefore the formation of the complexes. This study presented a pathway to promote the formation of starch-genistein complexes using an antisolvent method in two steps: (i) adding ethanol to the solution containing starch and genistein to increase genistein solubility, and (ii) evaporating ethanol from the solution to promote genistein interaction with starch. The complexes prepared using this antisolvent method had higher crystallinity (9.45 %), complex index (18.17 %), and higher content of resistant starch (RS) (19.04 %) compared to samples prepared in pure water or ethanol-containing aqueous solution without ethanol evaporation treatment (these samples showed crystallinity of 6.97 %-8.00 %, complex index of 9.09 %-11.4 2%, and RS of 4.45 %-14.38 %). Molecular dynamic simulation results confirmed that the changes in solution polarity significantly determined the formation of starch-genistein complexes. Findings offered a feasible pathway to efficiently promote starch interaction with genistein and in turn mitigate starch digestibility.


Assuntos
Digestão , Genisteína , Solubilidade , Amido , Amido/química , Genisteína/química , Etanol/química , Solventes/química , Simulação de Dinâmica Molecular
15.
Food Res Int ; 194: 114878, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-39232516

RESUMO

There has been a growing interest in incorporating sprouted wheat wholemeal (SWW) into whole grain baking, driven by its heightened nutritional content and improved nutrient bioavailability. This study aimed to assess how substituting soft wheat flour (SWF) with various levels of wheat wholemeal (unsprouted and sprouted) impacts the quality and sensory characteristics of hard pretzel sticks, which are globally enjoyed as popular snacks. The dough samples containing wholemeal did not demonstrate the same extensibility as the SWF dough sample. Additionally, substituting SWF with wholemeal increased the resistance to extension. Analysis of the Raman spectra of SWF and two other selected dough samples containing 75 % unsprouted wheat wholemeal (UWW) or SWW indicated α-helix as the dominant protein secondary structure. As the ratio of wholemeal to SWF increased in both unsprouted and sprouted wheat pretzel samples, protein and fiber content increased and starch content decreased, resulting in a decreased peak viscosity in an RVA (Rapid Visco Analyzer) test. The findings also showed no significant difference in hardness between the SWF pretzel sample and all other samples (p > 0.05), except when SWF was replaced with the highest level (75 %) of SWW, resulting in a significantly softer texture. Color analysis revealed that the introduction of wholemeal led to a decrease in the L* value, indicating a darker surface appearance in the samples, likely due to the presence of bran. Finally, sensory evaluation determined that replacing SWF with 25 % SWW resulted in the creation of a sample most similar to SWF in terms of sensory attributes. This research paves the way for future studies and advancements in the formulation and analysis of pretzel dough, creating opportunities to improve both the quality of the product and consumer satisfaction.


Assuntos
Farinha , Triticum , Triticum/química , Farinha/análise , Humanos , Valor Nutritivo , Paladar , Fibras na Dieta/análise , Viscosidade , Dureza , Pão/análise , Grãos Integrais/química , Manipulação de Alimentos/métodos , Lanches , Feminino , Masculino , Adulto , Amido/química , Culinária/métodos
16.
Food Res Int ; 194: 114887, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-39232521

RESUMO

White rice consumption has been regarded as a potential risk factor for non-communicable diseases including obesity and type 2 diabetes. Thus, increasing attention has been paid to develop slowly digested rices with acceptable palatability. As the most abundant component of rice kernels, the fine molecular structure of starch controls not only the texture & aroma, but also the digestion properties of cooked rice. A large number of studies have been conducted to see what molecular structural features control the digestibility and palatability of cooked rice, which further could be connected to starch biosynthesis to enable rices with targeted functionalities to be chosen in non-empirical ways. Nonetheless, little progress has been made because of improper experimental designs. For example, the effects of starch fine molecular structure on cooked rice digestibility and palatability has been rarely studied within one study, resulting to various digestion results. Even for the same sample, it is hard to obtain consistent conclusions and sometimes, the results/coclusions are even controversy. In this review paper, starch fine molecular structural effects on the texture, aroma and starch digestion properties of cooked white rice were summarized followed by a detailed discussion of the relations between the fine molecular structures of amylopectin and amylose to deduce a more general conclusion of starch molecular structure-cooked rice property relations. It is expected that this review paper could provide useful information in terms of how to develop slowly digested rices with acceptable palatability.


Assuntos
Culinária , Digestão , Oryza , Amido , Oryza/química , Amido/química , Amido/metabolismo , Amilopectina/química , Humanos , Amilose/química , Relação Estrutura-Atividade , Estrutura Molecular , Paladar
17.
Food Res Int ; 194: 114913, 2024 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-39232536

RESUMO

The formation of starch-polyphenol complexes through high-pressure homogenization (HPH) is a promising method to reduce starch digestibility and control postprandial glycemic responses. This study investigated the combined effect of pH (5, 7, 9) and polyphenol structures (gallic acid, ferulic acid, quercetin, and tannic acid) on the formation, muti-scale structure, physicochemical properties, and digestibility of pea starch (PS)-polyphenol complexes prepared by HPH. Results revealed that reducing pH from 9 to 5 significantly strengthened the non-covalent binding between polyphenols and PS, achieving a maximum complex index of 13.89 %. This led to the formation of complexes with higher crystallinity and denser structures, promoting a robust network post-gelatinization with superior viscoelastic and thermal properties. These complexes showed increased resistance to enzymatic digestion, with the content of resistant starch increasing from 28.66 % to 42.00 %, rapidly digestible starch decreasing from 42.82 % to 21.88 %, and slowly digestible starch reducing from 71.34 % to 58.00 %. Gallic acid formed the strongest hydrogen bonds with PS, especially at pH 5, leading to the highest enzymatic resistance in PS-gallic acid complexes, with the content of resistant starch of 42.00 %, rapidly digestible starch of 23.35 % and slowly digestible starch of 58.00 %, and starch digestion rates at two digestive stages of 1.82 × 10-2 min-1 and 0.34 × 10-2 min-1. These insights advance our understanding of starch-polyphenol interactions and support the development of functional food products to improve metabolic health by mitigating rapid glucose release.


Assuntos
Digestão , Ácido Gálico , Pisum sativum , Polifenóis , Amido , Concentração de Íons de Hidrogênio , Polifenóis/química , Amido/química , Amido/metabolismo , Pisum sativum/química , Ácido Gálico/química , Taninos/química , Pressão , Ácidos Cumáricos/química , Manipulação de Alimentos/métodos , Quercetina/química
18.
Carbohydr Polym ; 345: 122561, 2024 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-39227100

RESUMO

The digestibility of starch is affected by amylose content, and increasing amylopectin chain length which can be manipulated by alterations to genes encoding starch-branching enzymes (SBEs). We investigated the impact of Cas9-mediated mutagenesis of SBEs in potato on starch structural properties and digestibility. Four potato starches with edited SBE genes were tested. One lacked SBE1 and SBE2, two lacked SBE2 and had reduced SBE1, and one had reduced SBE2 only. Starch structure and thermal properties were characterised by DSC and XRD. The impact of different thermal treatments on digestibility was studied using an in vitro digestion protocol. All native potato starches were resistant to digestion, and all gelatinised starches were highly digestible. SBE modified starches had higher gelatinisation temperatures than wild type potatoes and retrograded more rapidly. Gelatinisation and 18 h of retrogradation, increased gelatinisation enthalpy, but this did not translate to differences in digestion. Following 7 days of retrogradation, starch from three modified SBE starch lines was less digestible than starch from wild-type potatoes, likely due to the recrystallisation of the long amylopectin chains. Our results indicate that reductions in SBE in potato may be beneficial to health by increasing the amount of fibre reaching the colon after retrogradation.


Assuntos
Enzima Ramificadora de 1,4-alfa-Glucana , Mutagênese , Solanum tuberosum , Amido , Solanum tuberosum/genética , Solanum tuberosum/química , Enzima Ramificadora de 1,4-alfa-Glucana/genética , Enzima Ramificadora de 1,4-alfa-Glucana/metabolismo , Enzima Ramificadora de 1,4-alfa-Glucana/química , Amido/química , Amido/metabolismo , Digestão , Sistemas CRISPR-Cas/genética , Amilopectina/química , Amilopectina/metabolismo , Amilose/química , Amilose/metabolismo , Proteínas de Plantas/genética , Proteínas de Plantas/química , Proteínas de Plantas/metabolismo
19.
Carbohydr Polym ; 345: 122563, 2024 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-39227102

RESUMO

γ-Cyclodextrin (γ-CD) is an attractive material among the natural cyclodextrins owing to its excellent properties. γ-CD is primarily produced from starch by γ-cyclodextrin glycosyltransferase (γ-CGTase) in a controlled system. However, difficulty in separation and low conversion rate leads to high production costs for γ-CD. In this study, γ-CGTase from Bacillus sp. G-825-6 STB17 was used in γ-CD production from cassava starch. With the introduction of sodium tetraphenylborate (NaBPh4), the total conversion rate was promoted from an initial 18.07 % to 50.49 % and the γ-CD ratio reached 78.81 % with a yield of 39.79 g/L. Furthermore, the mechanism was conducted via the determination of binding constant, which indicated that γ-CD exhibited much stronger binding strength with NaBPh4 than ß-CD. The reformation of water molecules and the chaotropic effect might be the main driving forces for the interaction. Additionally, the conformations of CD complexes were depicted by NMR and molecular docking. The results further verified different binding patterns between CDs and tetraphenylborate ions, which might be the primary reason for the specific binding. This system not only guides γ-CD production with an efficient and easy-to-remove production aid but also offers a new perspective on the selection of complexing agents in CD production.


Assuntos
Bacillus , Boratos , Glucosiltransferases , Simulação de Acoplamento Molecular , gama-Ciclodextrinas , gama-Ciclodextrinas/química , gama-Ciclodextrinas/metabolismo , Bacillus/enzimologia , Boratos/química , Glucosiltransferases/metabolismo , Glucosiltransferases/química , Amido/química , Amido/metabolismo , Manihot/química
20.
Carbohydr Polym ; 345: 122589, 2024 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-39227113

RESUMO

Maturity and drying treatment are important factors affecting the processing characteristics of lotus seeds and its starch. This study aimed to investigate the effect of maturity (from low to high-M-1, M-2, M-3, M-4) on far-infrared drying kinetics of lotus seeds, and on the variation of structure, gelation and digestive properties of lotus seed starch (LSS) before and after drying. As the maturity increased, the drying time reduced from 5.8 to 1.0 h. The reduction of drying time was correlated with the decrease of initial moisture content, the increase of water freedom and the destruction of tissue structure during ripening. The increased maturity and drying process altered the multiscale structure of LSS, including an increase in amylose content, disruption of the short-range structure, and a decrease in relative crystallinity and molecular weight. The viscosity, pasting temperature and enthalpy of LSS decreased during ripening, and drying treatment caused the further decrease. The digestibility of LSS increased during ripening and drying. Lotus seeds at M-4 would be optimal for obtaining shorter drying time, lower pasting temperature and enthalpy, and higher digestibility. This study provided theoretical guidance for achieving effective drying process and screening LSS with suitable processing properties through maturity sorting.


Assuntos
Lotus , Sementes , Amido , Sementes/química , Lotus/química , Amido/química , Dessecação/métodos , Viscosidade , Amilose/química , Peso Molecular , Digestão , Géis/química , Água/química , Temperatura , Estrutura Molecular
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