A Review of Non-gluten Components in Gluten-Free Bread Characteristics keep the doughs baking quality and viscoelastic qualities

Introduction

Bread is a basic item that is enjoyed all over the world and is con¬sidered an important source of carbohydrate in the food pyramid [1; 2]. It’s often made with a baking dough made of wheat flour, leavening agents, and water [3]. Gluten is a protein found in wheat that gives dough its cohesive and stretchy properties. Because glu¬ten makes bread inappropriate for those with celiac disease [4], different gluten-free grains are being used to substitute wheat.

Gluten-free cereals lack a substance that is analogous to gluten and gives the dough its cohesive and elastic properties, determining the final bread quality. Gluten is one of the most essential struc¬ture-building proteins in wheat-based goods, and it is responsible for their attractive quality and structure. Because of its unique vis¬coelastic qualities, developing gluten-free dough with comparable quality and structural properties is a difficult challenge and a huge industrial hurdle. Gluten-free product development has remained a technologically fascinating subject for researchers and the food in¬dustry [4]. A number of hydrocolloids or gums have recently been employed to create a polymer network that functions similarly to wheat gluten protein [5].

Gum Arabic is a dried, gummy exudate (polysaccharide) derived from the stems and branches of Acacia sanegal and seyal when the stem is wounded by tapping wounds, fungal infestation, or beetle infestation. It is a non-toxic, odorless, and tasteless natural sub¬stance made up mostly of high molecular mass polysaccharides and their magnesium, calcium, and potassium ions, which hydro-lyze to produce arabinose, galactose, rhamnose, and glucuronic acid [6]. In the baking sector, especially where non-wheat flours are employed, its viscosity and sticky qualities are important.

This is due to the fact that such baking items necessitate polymeric ingredients that replicate the viscoelastic properties of gluten in dough [7, 8].

As previously stated, there are a number of gums available for use in the food industry, and their molecular structure and chemical makeup vary based on aspects such as origin and extraction pro¬cesses [9]. As a result, the goal of this study is to determine wheth- er local Arabic gum is suitable for improving the cohesive and elastic properties of dough in order to improve the baking quality of gluten-free bread.

Techniques

This review report was created by searching the literature for non-gluten components, gum, Celiac Diseases, gluten free bread, and dough and bread quality utilizing available scientific informa¬tion and relevant literatures. The logical term operant was used to find objects that matched terms in a search.

The fundamentals of the paper

This review report will help bakers target gluten-intolerant cus-tomers by replacing wheat in bread recipes with gluten-free cereal. Also, because gluten-free cereals can be used instead of wheat in regions where wheat is not available, this evaluation is critical for persons living in places where wheat is not available. This docu-ment can also be used as input by anyone interested in Ethiopian gums. Celiac disease is now one of the most prevalent health issues in many nations [10]. Gluten proteins from regularly consumed di-etary sources such as wheat, rye, barley, and most likely oats cause it [11]. Celiac disease involves inflammation of the small intestine lining and damage to the intestinal mucosa, resulting in nutrient loss, particularly gluten from wheat. As a result, diarrhea, anemia, exhaustion, flatulence, weight loss, and osteoporosis develop [12]. Celiac illness affected about 1 (0.05 percent) of 2000 pregnant women with a median age of 25 years [13]. Celiac disease affects around 1% to 2% of the world’s population, and the only effective therapy is to avoid gluten-containing foods for the rest of their lives and develop gluten-free formulations that have similar prod¬uct qualities to those acquired with wheat [14].

Gluten, on the other hand, is important in breadmaking because it gives dough its viscoelastic properties. Dough qualities like as elasticity, mixing tolerance, stretching resistance, gas retention, volume, and texture are all determined by the gluten network [15]. So, the substitution of wheat flour with gluten free cereal flour fails to form viscoelastic dough when they are kneaded with water in a conventional bread making process. They form a batter rather than dough. Moreover, the batters tend not to retain carbon dioxide gas during proofing and baking. Thus, resulting in a bread with reduced loaf and specific volume, low moisture, dense structure, crumply texture and high crumb hardness compared to popular wheat breads [16]. As a result, the use of quality improvers has become an unavoidable part of increasing dough and bread quality. Various gluten-free formulations have recently been developed us¬ing non-gluten ingredients like alternative starches, dairy products (whey protein), gums, and emulsifiers. These alternatives help to mimic viscoelastic properties of gluten and thus improve the final quality of gluten-free bakery products [11].

Gluten-free bread’s influence

Gluten-free goods that completely omit gluten, proteins found in dietary sources such as wheat, barley, rye, oats, and derivatives of these grains, have recently become popular among persons with celiac disease or other gluten-related allergies. Celiac disease is a condition in which the gastrointestinal tract becomes inflamed as a result of eating gluten-containing foods. It is an immune-medi-ated mechanism in those who are genetically predisposed to this protein. As a result, the only treatment for celiac disease is a glu¬ten-free diet for the rest of one’s life [17]. Gluten is a large struc¬tural protein complex found in wheat that has functional qualities that give it a special place in wheat flour and goods made from it. The gluten network influences dough qualities like elasticity, mix¬ing tolerance, stretching resistance, and gas retention. As a result, a lack of it may result in liquid dough, which can therefore lead to poor-quality bread [18].

Rice and corn, the two most abundant cereals on the planet, are widely used to make gluten-free breads. Gluten-free bread has also been made with other ingredients such as sorghum, potato, cassa¬va, leguminous seeds, and buckwheat. In terms of quality and ac¬ceptance, commercially produced gluten-free breads fall short of their gluten-containing counterparts. As a result, nongluten com¬ponents such as starches and hydrocolloids are being used to rep¬licate the viscoelastic qualities of gluten and improve the ultimate quality of bread [19].

Gluten-free bread characteristics

Gluten-free bread tends to be of lower quality than wheat bread. Lack of gluten, the key protein matrix capable of expanding dough and retaining gas, results in weak dough (batter) with high permea¬bility to gas carbon dioxide and significant difficulties maintaining structure, resulting in a loss in baked good volume. The absence of the gluten network in gluten-free bread produces a rapid loss of moisture, which might result in a crumply structure and rapid stal¬ing [20]. Water holding and network building properties of dairy proteins delay the staling process and allow baked foods to retain moisture for longer [21]. Bread with no gluten has a pale, bland flavor and taste. Because commercial gluten-free bread is primar¬ily made of carbohydrates, it lacks fiber, vitamin, and nutritional content.

Non-gluten ingredients used to improve gluten-free bread quality

Cereals

In gluten-free systems, starch and its derivatives, such as malto-dextrins, are the predominant texture and structure-forming agents. They are often employed in the formulation of gluten-free bakery products to improve dough consistency and bread quali¬ty. For usage in gluten-free products, starches can be physically and chemically changed. In gluten-free dough and bread, resistant starches have also been used to substitute starch [17, 22].

Sourdough bread

Sourdough is a bread made from wheat and water that has been fermented with lactic acid bacteria and yeast starter cultures that are either added or found as contaminants in the flour. A growing number of works on using sourdough in gluten-free breadmaking are being published these days. Sourdough fermentation has long been known to improve dough qualities such as gas holding abil¬ity, gluten-free bread structure, flavor, and shelf life. It also im¬proves the bread’s texture and nutritional content, slows the aging process, and guards against mold and bacterial spoilage [23, 24]. Several studies published recently suggest that sourdough fermen¬tation can be used to improve the dough-handling characteristics of gluten-free batters. Controlling the fermentation and maintain¬ing consistent quality parameters of the sourdough for gluten-free dough production requires a good understanding of the microbial interactions that occur during sourdough fermentation [4].

Gums/hydrocolloids

Gums are a broad category of long-chain polymers that are mostly utilized to improve gluten-free bread quality. They are capable of managing both the rheology of dough and the texture of an aque¬ous food system during emulsion stabilization, suspension, and foaming in the food industry [20]. They are employed as stabiliz-ers, thickening agents, gelling agents, water binders, texturizers, and adhesives in a variety of food applications. Gum increases gluten-free wheat dough characteristics by boosting water ab¬sorption capacity and making the dough viscoelastic, resulting in bread with better loaf and specific volume, soft texture, and long shelf life by delaying bread staling [25]. Similarly, Xanthan gum in bread boosted the dough’s water absorption capacity as well as the softness and yield of the bread [26]. In addition, using varying concentrations of Guar Gum and Gum Arabic increased the func¬tional qualities of sorghum flour, resulting in bread of acceptable quality [27]. Gear gum has also been shown to delay bread stale-ness by a softening effect induced by a putative suppression of amylopectin retrogradation [28].

Hydroxypropyl methylcellulose

The best gluten replacer is hydroxypropyl methylcellulose, which has been widely utilized. It’s used as a gluten-free bread improver, giving it a higher specific volume, a smoother crumb, and better sensory qualities. When utilized, it causes the bread to increase in volume, moisture content, and crumb firmness [29]. Hydroxy-propyl methylcellulose enhances the volume and quality of glu-ten-free dough by improving gas retention and water-holding ca-pacity during proofing [30].

Whey protein

Whey protein is a functional agent that is added to bread to help it absorb more water and provide more nutrients [21]. When mixed with starch, a mesoscopically structured whey protein particle system has some of the elastic and strain hardening properties of gluten. However, upon kneading, the extensibility is reduced and the particles are more stable than gluten particles, owing to an excessive amount of internal crosslinking. The ability to create disulfide bonds affects the qualities of the particle network, even if too many disulfide bonds might result in stiff dough and poor bread attributes. According to several research, adding 6% whey protein powder to gluten-free bread increased the protein level by two times without changing the dietary fiber content [31]. In comparison to gluten-free bread, gluten-free bread enriched with whey protein has a darker brown hue, owing to a stronger mallard browning reaction and caramelization. Whey protein supplemen¬tation also improves gluten-free bread tissue characteristics such as kneading capabilities, loaf size, and volume [32].

Dietary fiber

Polysaccharides that cannot be digested by human digestive en-zymes in the colon are referred to as dietary fiber. When dietary fiber is integrated into food systems, it provides a wide range of functional qualities. Its presence aids in the alteration and enhance¬ment of food texture, sensory properties, and shelf life. Soluble and insoluble fibers, for example, can be utilized to replace gluten in bakery items like cakes and bread [33]. Researchers discovered that using them in bakery items improved the specific volume, crumb color, and crust color. Gluten-free breads with larger loaf volume and crumb softness are made using dietary fiber from ce¬real grains like maize and oat [34].

Studies on the Rheological characteristics of dough

For many researchers, getting the data needed to characterize the dough’s rheology has proven to be a difficult task. Dough rheol¬ogy provides information on the material’s mechanical properties and processing performance, with the goal of predicting ultimate product quality such as mixing behavior, sheeting, and baking per¬formance. Gluten is a protein found in wheat that gives dough its viscoelastic and extensible qualities, allowing it to develop good pastry items [20]. The absence of gluten in a product has a sub¬stantial impact on both the rheology of the dough and the quality of the finished product. In comparison to wheat dough, gluten-free doughs have inferior elasticity and cohesion, poor gas holding ca¬pacity, weak strength, inconsistencies while mixing, and poor tex¬ture. Gums/hydrocolloids are commonly used to improve dough rheology by allowing the dough to bind more water, increase dough viscosity, consistency, and strength, increase cohesiveness and extensibility, increase gas retention capacity and rheo-ferment graphic index, and increase elasticity in corn, rice, and buckwheat dough [35].

Discussion

Gum Arabic (Acacia-Senegal) manufacture in Ethiopia

Ethiopia is one of the countries having a high concentration of Acacia species. Acacia Senegal and Acacia seyal are the two Aca¬cia species most commonly used in the production of gum arabic in the country [36]. Ethiopia currently produces three forms of gum arabic: Humera, Gumero, and Harar-Sidamo. The Ethiopi¬an production system can be classified into two categories: inten¬tional tapping and spontaneously oozing collection. The majority of the gums produced were sent to foreign markets without being added value. Ethiopia is divided into Somalia, Gambella, Oromia, and Tigray [37].

Gum Arabic’s Importance in Gluten-Free Bread

In the backing sector, especially where non-wheat flours are em¬ployed, its viscosity and sticky qualities are important. Gum Ara¬bic improves gluten-free dough features by causing the dough to bind more water in the gluten-free dough matrix, improving cohe¬sion and gas retention. It also improves dough stability and consis¬tency, can be used as thickening agents by raising batter viscosity at room temperature and forming gels that lend viscos-elastic be¬havior to dough, resulting in enhanced loaf and specific volume, and can help baked goods retain moisture. Making the bread have a soft texture and a lengthy shelf life by preventing it from rotting. Furthermore, gum Arabic is utilized in the backing sector to main¬tain overall product quality during storage while also extending shelf life by maintaining a steady moisture content and preventing staling [25].

Gum’s potential health advantages

The joint FAO/WHO expert committee on food additives deter¬mined that gum Arabic is safe to consume on a daily basis for humans. Since the 1970s, the US Food and Drug Administration (FDA) has regarded it as a safe dietary fiber. Gum Arabic possess¬es dose-dependent prebiotic effects in healthy human volunteers.

Normal human volunteers who consumed varied daily doses of gum Arabic (5, 10, 20, and 40 g) for up to 4 weeks saw significant increases in Bifidobacterial, Lactose bacteria, and Bacteroides, im¬plying a prebiotic impact. In animals and people, there is also a drop-in plasma cholesterol level [38]. Gum Arabic has been shown to have anti-obesity benefits in both people and animals when used as a dietary supplement. It is high in dietary fiber, which aids in weight loss and fat deposition. For example, healthy women took either gum Arabic or a placebo every day to see if it may prevent obesity by several mechanisms, such as decreasing caloric density of food and reducing fat absorption in the small intestine. Those who took the gum Arabic experienced a significant drop in body mass index and body fat percentage at the end of the six-week research period [39].

Dietary fiber helps to keep blood sugar levels in check. While there isn’t much clinical study on acacia fiber and diabetes, there is some. Gum Arabic’s fiber may aid to prevent against diabetes-re-lated problems. Several varieties of gums have been proven to help with ailments like diarrhea, sore throats, kidney infections, wound infections, and gum infections. Only sporadic studies as-sessing their antibacterial properties have been published, leading to underestimation and, at times, over-desires for gums and gum products in treatments [39].

Characteristics of Ethiopian-grown gum Arabic

Ethiopia’s dry areas have a lot of potential for commercial produc-tion of natural gums like gum Arabic. Gum Arabic quality criteria must meet specified chemical specifications, according to inter-national specifications. The majority of gum Arabic produced in Ethiopia meets the international standard’s suggested standards [40]. Gum Arabic’s chemical composition varies depending on its source, climatic conditions, soil environment, and the age of the trees used to make it.

Conclusion

The properties of gluten-free doughs and an alternative way for overcoming the difficult chores involved in dough preparation. Hydrocolloids (gums) have been extensively studied as gluten-free dough and baked goods additions and improvers. A variety of in-vestigation reports illustrate the history of gluten-free bread and its characteristics in traditional bread production when compared to popular wheat bread. The literature, on the other hand, focuses on alternate methodologies or non-gluten components that can be employed to improve the quality of gluten-free bread baking. The majority of gum arabic farmed in Ethiopia has qualities that are in line with international standards and have significant potential health advantages. In this case, local gums may be preferable for manufacturing cakes, confectioneries, and gluten-free bread due to their pasting and farinographic qualities

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