Quality and antioxidant properties of functional rice muffins enriched with shiitake mushroom and carrot pomace

This study developed functional muffin by incorporating bioactive-rich food materials into rice muffin formulation. Rice flour was progressively replaced with shiitake mushroom powder (MP) and carrot pomace powder (CP) and effects on pasting, physical and textural properties, as well as the antioxidant activity and consumer acceptability, were evaluated. The pasting properties of rice flour were significantly influenced (P < 0.05) by MP and CP incorporation. The additional increase in the levels of MP and CP decreased the volume of enriched muffins with a subsequent increase in weight and hardness. Higher polyphenol and carotenoid contents were observed in enriched muffins, exhibiting higher 2,2-Diphenyl-1-picrylhydrazyl (DPPH) antioxidant activity compared to rice muffins. Sensory result revealed enriched muffins to have comparable and better consumer acceptability than rice muffin. Improvement in antioxidant properties of the developed functional rice muffins by MP and CP incorporation makes it a potential snack, suitable for consumption for its health benefits.     

Physicochemical assessment of fresh chilled dairy dessert supplemented with wheat germ

Wheat germ is an available and economical source of protein, vitamins and antioxidants with an increasing application in food products. The main aim of this study was to investigate the effects of different levels (0.0, 2.5, 5.0, 7.5 and 10.0%) and particle sizes (120, 210 and 354 μm) of wheat germ on physicochemical properties of fresh chilled dairy dessert. With increasing wheat germ level, dry matter of the dessert increased while the pH decreased. Particle size had no significant effect on these parameters. Increasing the wheat germ content and particle size enhanced darkness, hardness, cohesiveness and gumminess of the desserts while decreasing springiness and water release of the samples. Wheat germ level had greater effects on different quality aspects of the desserts than its particle size. The most acceptable dessert was produced with no more than 5.0% wheat germ with either of the particle sizes used in this study.     

Influence of wheatgrass and mung bean microgreens incorporation on physicochemical,textural, sensory,antioxidant properties and phenolic profile of gluten-free eggless rice muffins

In this study, gluten-free eggless muffins were prepared by incorporating wheatgrass (WP) and mung bean microgreens (MP) powder in rice flour at 2%, 4% and 6% levels. The batter rheology was evaluated and muffins studied for changes in physicochemical, textural, antioxidant, sensory properties and phenolic composition. The batter viscoelasticity, firmness, gumminess and chewiness increased, while height and specific volume (SV) of muffins declined by increasing the level of WP and MP incorporation. WP and MP incorporated muffins exhibited higher protein content, dietary fibre, phenolics, flavonoids and antioxidant properties. WP incorporated muffins were rich in total free and bound phenolic acids, while MP incorporated muffins had more total free and bound flavonoids. The 6%MP incorporated muffins were rated lower by sensory panellists, while 2%WP incorporated muffins were acceptable with better nutritional profile, similar cohesiveness, springiness and SV to that of rice alone muffins.     

Effect of dried guduchi (Tinospora cordifolia) leaf powder on rheological,organoleptic and nutritional characteristics of cookies

Tinospora cordifolia (Guduchi) is a shrub with various medicinal properties like, antioxidant, anti-diabetic, anti-inflammatory, antihepatotoxic, etc., and widely used in Ayurvedic preparations. Use of dried Tinospora leaf powder (DTLP) at the levels of 2.5, 5.0 and 7.5% on the rheological characteristics of wheat flour; organoleptic and nutritional characteristics of cookies was studied. Incorporation of increasing amount of DTLP from 0 to 7.5% increased farinograph water absorption, decreased dough stability; increased amylograph gelatinization temperature, decreased peak viscosity; increased hardness, decreased cohesiveness and springiness of cookie dough; decreased spread ratio and increased breaking strength of the cookies. Sensory evaluation showed that cookies incorporated with 5% DTLP were acceptable. Addition of DTLP increased the protein, dietary fiber, iron, calcium, radical scavenging activity and β-carotene contents of the cookies. The results showed the possibility of utilizing DTLP to improve the nutritional properties of cookies.     

SUPPLEMENTATION OF WHEAT MUFFINS WITH DRIED DISTILLERS GRAIN FLOUR

The use of dried distillers grain (DDG) flour as an ingredient for preparing wheat muffins was investigated. DDG can be incorporated up to 10% in wheat muffins without significant changes in appearance, texture, flavor, and overall acceptability. Addition of either raisins or blueberries to wheat muffins allowed for an increase in the incorporation level of DDG to 15%. Wheat muffins supplemented with DDG had a higher protein, amino acids, and certain minerals content than wheat muffins without DDG.     

Influence of kidney bean,field pea and amaranth protein isolates on the characteristics of starch‐based gluten‐free muffins

This study was undertaken to see the effect of kidney bean (KB), field pea (FP) and amaranth (AM) protein isolates on the viscoelasticity and gluten‐free muffin‐making properties of starch‐based batter. The characteristics of gluten‐free muffins were also compared to those prepared with wheat gluten (WG). The incorporation of different protein isolates enhanced batter viscoelasticity (increased storage and loss modulus and decreased tan δ) and resulted in muffins with higher specific volume, springiness and cohesiveness. Firmness of the muffins varied with the source of protein isolate. KB protein isolates resulted in firmer muffins compared to those made from FP, AM and WG. The crust colour became more reddish‐brown on incorporation of protein isolates, while crumb colour varied with the source of protein. Overall, the results revealed that KB, FP and AM protein isolates can be successfully used to prepare gluten‐free muffins with characteristics comparable to those made from wheat gluten.     

BAKING AND SENSORY CHARACTERISTICS OF MUFFINS INCORPORATED WITH APPLE SKIN POWDER

ABSTRACT

Apple fruit skin, a rich source of dietary fiber and phenolics, is a by‐product of apple processing. The feasibility of incorporating dried apple skin powder (ASP) as a value‐added food ingredient in bakery food products using a model system of muffins was investigated. The blanched, dehydrated and ground ASP was incorporated into muffins at 0, 4, 8, 16, 24 or 32% (w/w) levels with replacement of equivalent amount of wheat flour of a standard muffin mixture. The highest level of replacement (32% w/w) had a significant adverse effect on the baking characteristics. A taste panel of 66 panelists showed that the replacement of wheat flour with 8, 16 or 24% ASP in the muffin mixture did not affect the overall acceptability.

PRACTICAL APPLICATIONS

Identification of ways to incorporate apple skins, one of the by‐products of apple pie and sauce manufacturing, as a health food ingredient in human diet could provide many health benefits. Furthermore, better use of the by‐product will also provide benefits to the apple industry as well as solutions for environment concerns associated with disposal. The results of the present study indicate that blanched and dehydrated apple skin powder (ASP) could be considered as an alternative dietary fiber source or specialty food ingredient for muffins. Therefore, the potential for the industrial exploitation of ASP as a health food ingredient for the bakery industry and selected functional foods is promising.     

Effect of baking on dietary fibre and phenolics of muffins incorporated with apple skin powder

Apple fruit skin, a rich source of dietary fibre and phenolics, is a by-product of apple processing. The effect of baking on the dietary fibre, phenolics, and total antioxidant capacity was investigated using a model system of muffins incorporated with dried apple skin powder (ASP) as a value-added food ingredient. The blanched, dehydrated, and ground ASP contained approximately 41% total dietary fibre and oxygen radical absorption capacity (ORAC) of 52 mg Trolox equivalents g⁻¹ dry weight. The total dietary fibre content, total phenolic content, and total antioxidant capacity of muffins were positively correlated to the amount of ASP incorporated into muffins. The mean percent recovery of quercetin glycosides, catechins, chlorogenic acid, phloridzin, and cyanidin galactoside after baking were 61%, 57%, 53%, 44%, and 20%.     

Antioxidant Peptide Fractions Isolated from Wheat Germ Protein with Subcritical Water Extraction and Its Transport Across Caco‐2 Cells

Wheat germ protein (WGP) was extracted with subcritical water and then hydrolyzed with Alcalase 2.4 L to obtain antioxidant hydrolysates. Wheat germ peptides (WG‐P, Mw < 1 kDa) were purified by using Sephadex G‐15 column chromatography. The results showed that WG‐P‐4 possessed the strongest DPPH radical scavenging activity in comparison with other peptides fractions. In addition, free amino acids and LC‐MS/MS analysis showed that Gly‐Pro‐Phe, Gly‐Pro‐Glu, and Phe‐Gly‐Glu were the major peptides of WG‐P‐4. Interestingly, the WG‐P‐4 fractions had good absorption characteristic. Moreover, the ratio of P_app both sides of apical compartment (AP) and basolateral compartment (BL) were between 0.5 and 1.0 on Caco‐2 cell model, which indicated that transmembrane transportation was mainly passive transport. Therefore, WG‐P could exert an effective antioxidant action by across the intestinal epithelium.     

Effect of thermal processing on antioxidant properties of purple wheat bran

Antioxidant activity of purple wheat bran, heat-treated purple wheat bran, and purple wheat bran muffins was evaluated to determine the impact of thermal processing on potential health benefits. The purple wheat bran and muffin samples were analyzed for total phenolic content, anthocyanin content and free radical scavenging activity using peroxyl (oxygen radical absorbance capacity assay) and 2,2-diphenyl-1-picrylhydrazyl (DPPH assay) radicals. Total phenolic content and oxygen radical absorbance capacity (ORAC) values of sample extracts were significantly affected by various extracting solvents. The conditions selected for heat treatment did not markedly change antioxidant activity of purple wheat bran. However, there was a significant reduction in total phenolic contents, ORAC values and total anthocyanins during processing of purple wheat bran- or heat-treated purple wheat bran-enriched muffins. On the contrary, muffin extracts still remained excellent in DPPH radical scavenging activity.     

Solid-state fermentation by S. cerevisiae with high resistance to ferulic acid improves the physicochemical properties of wheat bran and quality of bran-rich Chinese steamed bread

Wheat bran has numerous health benefits, but its poor processing and sensory properties limit its application in the staple food industry. Fermentation by S. cerevisiae changes the performance of wheat bran. However, high levels of ferulic acid (FA) inhibit S. cerevisiae. The effects of solid-state fermentation of S. cerevisiae with high resistance to FA on the physicochemical properties of wheat bran and the quality of bran-rich Chinese steamed bread (CSB) were investigated. The results showed that the growth of S. cerevisiae was inhibited by FA in a dose-dependent manner. Short-term adaptation strategies efficiently improved the tolerance of S. cerevisiae to FA stress. Compared with the parental strain (PS), fermentation of the short-term adapted strains (adapted strains) significantly increased the FA, total phenol, and soluble dietary fiber content in wheat bran. Wheat bran fermented by the adapted strains had a higher antioxidant capacity than wheat bran fermented by PS. In addition, compared with the PS, the wheat bran fermented by the adapted strains can decrease the hardness, improve the specific volume, and the quality of CSB. Thus, solid-state fermentation of the adapted strain is a potentially effective method to improve the nutritional and physicochemical properties of wheat bran as a cereal food ingredient.     

Olive stone powder: A potential source of fiber and antioxidant and its effect on the rheological characteristics of biscuit dough and quality

Being waste products of olive fruits, olive stones could be used as a healthy functional food ingredient thanks to their rich antioxidant properties, nutrients and dietary fibers. In this study, wheat flour was substituted by olive stone powder at levels of 0, 5, 10 and 15%. The rheological properties of biscuit dough and proximate composition, color values, total phenolic content, antioxidant activity, textural characteristics and sensorial properties of biscuit samples were investigated. Wheat flour replacement by olive stone powder increased antioxidant activity, fat and fiber content of biscuit samples (p < 0.05). The biscuits prepared with addition of 15% olive stone powder had 30.44 ± 0.03% DPPH radical scavenging activity, 11.22 ± 0.09% crude fiber, and 26.32 ± 0.22% fat. According to results of sensory analysis, wheat flour could be substituted up to 15% by olive stone powder to prepare biscuits without causing unacceptable product in terms of sensory properties.     

Effect of modified cassava starch as a fat replacer on the texture and quality characteristics of muffins

The aim of this study was to evaluate the effects of modified cassava starch as a partial fat replacer on the quality characteristics of muffins. Cross-linked cassava starch (CCS) was used to replace fat at 8, 12 and 16% substitution levels, based on the total weight of the wheat flour. The thermal properties of the CCS and wheat flour were assessed, and the pasting and farinographic properties of the wheat flour-CCS mixtures were also evaluated. The addition of CCS had an adverse effect on the dough stability and development time, which decreased as the amount of CCS increased in the mixture. The gelatinization and retrogradation entalphies of the CCS were higher than those of the wheat flour. The final and setback viscosities of the wheat flour were higher than those of the wheat flour-CCS mixtures. Furthermore, the quality and textural characteristics of the muffins were determined. There were no significant differences in the weight loss, specific volume, crumb moisture content or color parameters of the muffins. The muffins containing CCS at fat replacement levels of 8% (T8) had the textural properties that were closest to those of the muffins without the CCS (control sample). Thus, this sample was chosen to evaluate the storage behavior over 7 days along with the control muffins. The T8 samples had a higher crumb firmness during the storage. There were no significant differences in the overall acceptability of the T8 and control muffins on days 2 and 4 of the storage. So, the T8 muffins had good acceptability by consumers despite having a higher firmness during the storage.     

Antioxidant properties of commercial soft and hard winter wheats (Triticum aestivum L.) and their milling fractions

The total phenolic content (TPC), total antioxidant activity (TAA), 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) scavenging capacity, inhibition of coupled oxidation in a β‐carotene–linoleate model system, iron(II) chelation activity and inhibition of copper‐induced oxidation of human low‐density lipoprotein (hLDL) cholesterol of 80% ethanolic extracts of soft and hard winter wheat samples and their milling fractions, namely flour, germ, bran and shorts, were investigated. Soft wheat extracts examined demonstrated higher TPC and TAA compared to those of hard wheat extracts. The germ fraction possessed the highest TPC, followed by bran, shorts, whole grain and flour for both wheat types examined. The TAA of both wheat types showed similar results except that shorts performed better than bran in this assay. Free radical scavenging properties of whole grain and milling fractions of both soft and hard wheat samples were examined against DPPH radical. The germ and flour fractions demonstrated the highest and lowest DPPH radical scavenging activity, respectively, among wheat fractions. Wheat extracts were also efficient in preventing bleaching of β‐carotene, which is also known to be free radical mediated. In the iron(II) chelation assay the flour extracts demonstrated excellent activity, while the germ extracts showed a weak activity. The trends were similar in both soft and hard wheat for the iron(II) chelation assay. Wheat extracts also inhibited copper‐induced oxidation of hLDL. In LDL oxidation assay, wheat extracts performed better than the reference antioxidant, ferulic acid. Thus wheat phenolics may serve as effective antioxidative components as measured by in vitro techniques. Copyright © 2005 Society of Chemical Industry     

Pineapple Waste Extract for Preventing Oxidation in Model Food Systems

Pineapple (Ananas comosus) is consumed in the form of chunks (canned), cubes, fruit salad, and also in juices, concentrates, and jams. In the processes to produce these products, the waste generated represents a high percentage of the total fruit. Some studies have shown that residues of certain fruits, such as pineapple, have the same antioxidant activity as the fruit pulp. So although these residues are discarded, they could be used as an alternative source of polyphenols, as natural antioxidants. This study is focused on the antioxidant activity of wastes obtained in the production of pineapple products and their application. The polyphenols’ scavenging activity was determined by the oxygen radical antioxidant capacity assay. The antioxidant potential was determined in emulsions (o/w) and in muffins, where the primary oxidation products (by peroxide value, PV) and the secondary oxidation products (by thiobarbituric acid reactive substances) were analyzed. In addition the muffins were analyzed by means of a triangular sensory test. The PV method showed that pineapple waste extracts caused a reduction in oxidation products of 59% in emulsions and 91% in the muffins. The reduction in TBARs values for emulsions were 27% and for muffins were 51%. The triangular sensory test showed that the samples containing the extract were not distinguished from the control (α = 0.05).     

Influence of jambolan (Syzygium cumini) and xanthan gum incorporation on the physicochemical,antioxidant and sensory properties of gluten‐free eggless rice muffins

This study was undertaken to prepare antioxidant‐rich gluten‐free eggless muffins from rice flour blended with varying amounts of jambolan fruit pulp (JFP) and xanthan gum (XG). The batters were evaluated for fundamental rheology, while muffins were analysed for physicochemical (colour, volume, water activity, total phenolic and flavonoid content), texture and sensory properties. The incorporation of JFP and XG increased batter viscoelasticity (increased G′ and G″ while decreased tan δ). JFP incorporation increased greenness (lower a* value), cohesiveness, resilience, water activity (a_w), total phenolic content, total flavonoid content, DPPH and ABTS inhibition of the muffins. Further, XG improved muffin quality characteristics (appearance, specific volume and resilience)_. Sensory analyses revealed that JFP incorporation improved the consumer acceptability of the muffins.     

Pomegranate seed powder as a functional component of gluten‐free bread (Physical,sensorial and antioxidant evaluation)

The purpose of this study was to evaluate the effect of the addition of pomegranate seed powder (PSP) on physical, sensorial and antioxidant properties of gluten‐free bread. The PSP was incorporated at different levels (2.5%, 5.0%, 7.5% and 10%) into formula of gluten‐free bread. Control gluten‐free bread made without any addition of PSP was used for comparison. The results showed that the specific volume and springiness of gluten‐free breads increased, whereas hardness and chewiness decreased significantly with increasing PSP addition. The addition of PSP into gluten‐free bread decreased the lightness and yellowness of crumb and crust colour, while redness increased. Total phenolics content (TPC) increased from 46% to 181% with PSP addition (2.5%–10%). Moreover, antioxidant activity was significantly higher for bread with PSP. For bread with the highest percentage of PSP, the highest antioxidant activity was obtained. For sensorial and antioxidant activity, the optimum level of PSP addition was found to be 7.5%.     

Nutritional properties and phenolic content of a bakery product substituted with a mango (Mangifera indica) ‘Ataulfo’ processing by-product

Wheat flour and cane sugar were partially substituted (50 and 75%) by a mango-processing by-product (MPB) as an added-value food ingredient in muffins. Their sensory analysis, chemical composition, antioxidant activity and in vitro starch hydrolysis properties were studied. Sensory analysis showed statistically significant difference (p < 0.05) between control and muffins 75% MPB substituted level (p < 0.05) with the highest score. Proximate analysis revealed that muffins substituted with MPB had significantly (p < 0.05) higher moisture, ash, soluble, insoluble and total indigestible fraction contents but lower total soluble carbohydrates and available starch contents than a non-substituted (control) muffin. Total soluble polyphenol (TSP) content increased about three times (from 1.86 to 5.36 g GAE/100 g dw) with MPB substitution. Chlorogenic, caffeic, gallic, hydroxycinnamic and ferulic acids were identified as major TSP. Muffins with MPB, exhibited better antioxidant properties (104.0 to 108.5 μmol TE/g dw for DPPH assay and 34.1 to 19.1 mmol TE/g dw for FRAP assay) than the control formulation. The presence of high phenolic and insoluble indigestible fraction contents, which may be responsible of the lower rate of starch hydrolysis observed in muffins prepared with MPB, might modulate the postprandial glucose response in vivo. MPB may be used as an ingredient in foods with add-value with potential health-promoting features, besides providing a solution to the environmental problems associated with the disposal of mango by-products.     

麦麸膳食纤维咀嚼片配方优化及其体外抗氧化能力

以食用菌秀珍菇发酵麦麸膳食纤维复合产物为主要原料,采用全粉末直接压片技术,选取片质量差异、崩解时限、硬度及脆碎度的综合评定值为评价指标,通过响应面法确定麦麸膳食纤维咀嚼片最佳配方,并分析其体外抗氧化能力。结果表明:麦麸膳食纤维咀嚼片的最佳配方为硬脂酸镁用量2%、黄秋葵超细粉用量34%和麦麸膳食纤维复合菌粉用量64%,制成的咀嚼片表面光滑、色泽均一、硬度适中;体外抗氧化能力的测定显示,麦麸膳食纤维咀嚼片具有较高的脂质过氧化抑制作用和羟自由基清除能力,脂质过氧化抑制率的IC50值为8 mg/mL,羟自由基清除率的IC50值达20 mg/mL。研究通过辅助强制加料配合直接压片的技术,对麦麸膳食纤维咀嚼片的配方工艺和体外抗氧化性进行研究,旨在为产品的功能营养价值提供一定理论支持。