FNSFood and Nutrition Sciences2157-944XScientific Research Publishing10.4236/fns.2019.10871FNS-94471ArticlesBiomedical&Life Sciences Dietary Supplementation of <i>κ</i>-Carrageenan to Improve the Physio-Chemical and Functional Properties of White Bread MayaRaman1AmmuDinakaran1*AkshayaRavindran1ThazhakotVasunambisan Sankar1TeralandurKrishnaswamy Srinivasa Gopal1Center of Excellence in Food Processing Technology, Kerala University of Fisheries and Ocean Studies, Cochin, India070820191008997101023, July 201918, August 2019 21, August 2019© Copyright 2014 by authors and Scientific Research Publishing Inc. 2014This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/

Fiber intake improves gut health and prevents non-communicable diseases. The current study investigates the substitution of carrageenan in white bread and evaluates its effect on the physiochemical and structural characteristics of bread. The 100% wheat flour was used as control and the test sample contained 4% carrageenan. The physio-chemical analysis showed that carrageenan-substitution improved the hydration properties of the flour (WHC—1.33 g/g; SC—3.50 ml/g). Carrageen substituted bread had reduced the loaf volume. The fiber content in carrageenan-substituted bread was noticeably higher (9.4 g%) than control (3.5 g%). Crude lipid (4.6 g%) and protein (7.0 g%) content improved with carrageenan-substitution. The mineral contents (Na, K, Mg, Ca, Fe, and Zn) were increased in carrageenan-breads. The texture profile analysis showed a decreased hardness (H1—92.3 N, H2—62.5 N) and improved springiness (5.3 mm) in carrageenan-bread.

Carrageenan Wheat Flour Bread Texture Profile Analysis Physio-Chemical Properties1. Introduction

Bread is one of the oldest functional foods and is an important part of total daily food consumed all over the world; even though, in India, it is a secondary staple food. Nutritionally, it is a good source of fibers (non-starch polysaccharides including arabinoxylans), minerals and vitamins. It has gained considerable attention due to its nutritional and health benefits [1]. Functional bakery products are becoming increasingly popular. Cereals (rye, corn, rice and oats), grains (buckwheat, amaranth and quinoa), sprouts, etc. were reported to improve the nutritional profile of bread by increasing the concentration of polyphenols, ferulic acid, glutathione, plant sterols, vitamins, minerals, etc. [2] [3] [4].

Several potential terrestrial and marine hydrocolloids have been proposed to increase the functionality and health benefits of bakery products especially bread including alginates, carrageenans, agar, guar gum, methylcellulose, carboxymethylcellulose (CMC) and hydroxypropylmethylcellulose (HPMC) [5] [6]. Functional and nutritional property of bakery products were reported to be improved by hydrocolloids such as polysaccharides [7], marine functional ingredients [8] [6], protein sources such as cereals, tubers, corn gluten, corn germ and rice bran [9], natural antioxidants [10] [11], plant extracts such as green tea [12], grape seed extracts [13] and prebiotics [14] [15]. The alginates (from brown algae) and carragenates (from red algae) are the few prospective hydrocolloids that were reported to be rich in bioactive compounds and dietary fibers; and impart functional effects such as modification of dough/batter rheology and keeping quality of finished baked products [16]. These also contribute to high water retention capacity and exhibit fat mimetic properties [17] [18]. These also contribute to antistaling effects [8]. Marine hydrocolloids (polysaccharides), apart from acting as functional ingredient, these were reported to have a positive influence on several health aspects including reducing the risk of colon cancer, constipation, hypertension, hypercholesterolemia, obesity, and diabetes, and enhance immunological activities, antibacterial activity, etc. [19] [20] [21].

κ-Carrageenan, a marine hydrocolloid, is a common food additive extracted from red algae. Even though, it adds no nutritional value or flavor to foods or beverages, it finds wide application in the food industry because of its unique chemical structure [22] [23] [24] [25]. It serves as a substitute for fat and acts as thickening, gelling and stabilizing agent. In the bakery industry, it has been reported to improve the dough stability [26] and affects the bump area related to the formation of amylase-lipid complex [27]. It also finds application in many processed foods such as frozen pizzas, nutritional bars, canned pet foods, liquid infant formula, etc. [28].

In the present scenario wherein the marine functional bioactive components are becoming popular, carrageenan-incorporated bread could offer a palatable way to incorporate marine fibers in diet and utilize its health benefits. Therefore, the current study investigated the effect of carrageenan supplementation in white bread and its effect on the physiochemical and functional properties of the product. The work is purely innovative and not done elsewhere.

2. Materials and Methods2.1. Materials

Commercial wheat flour, active dry yeast, salt, sugar, oil, milk and Vitamin C (food grade) purchased from a local supermarket (Cochin, Kerala, India) were used for the bread and dough production. Other analytical grade chemicals used in the experiments were obtained from HiMedia® and Sigma-Aldrich® (Cochin, Kerala, India). Carrageenan (food-grade, pH 8.2, Plate count < 5000) was obtained from Aquarev Industries (Una, Gujarat, India). Water used in the experiments was deionized unless specified otherwise. This work was carried out at Centre of Excellence in Food Processing Technology, Kerala University of Fisheries and Ocean Studies, India.

2.2. Preparation of Bread

Bread production was conducted through both straight-dough bread-making method and sponge-and-dough method, with slight modifications [29]. Control samples were prepared by mixing 61.7 g flour, 0.009 g yeast, 26.1 g water, 0.02 g sugar, 0.00006 g salt, 0.02 g refined sunflower oil (enriched with Vitamin A and D), 0.07 g milk and 50 ppm Vitamin C were taken per 100 g bread. Carrageen-bread contained all the ingredients including 4% carrageenan (Table 1). As in straight-dough methods, all the ingredients were combined at once and dough was mixed by hand. The dough was subjected to fermentation for 16 h at 29˚C (sponge-and-dough method). After leavening, it was molded, proofed at 37˚C under 80% relative humidity for 30 min and finally baked for 30 min at 180˚C (Morphy Richards Oven-Toaster-Griller 28 RSS, Cochin Kerala, India). After baking, the breads were cooled for 2 h at 20˚C, packed in butter paper (350 g/bag) and then stored at 20˚C (Figure 1).

3. Analysis of Physiochemical Properties3.1. Physical Properties of Flour3.1.1. Measurements of pH

The pH of bread samples was measured by a pH meter (Eutech Instruments pH 510, CyberScan, India) using Approved Methods [29]. Bread samples were cut and mixed with distilled water in 1:10 ratio and stirred for 30 min. The supernatant was collected and pH values were recorded.

Composition of bread (control and carrageenan-bread)
CompositionControl breadCarrageenan-bread
Flour (g)61.459.9
Yeast (g)0.90.8
Water (g)2625.3
Sugar (g)2.12
Salt (g)0.60.6
Oil (g)1.81.7
Milk (g)7.47.2
Vitamin C (g)0.0090.009
Carrageenan02.4
3.1.2. Measurement of Bulk Density

A clean, dry 10 ml graduated measuring cylinder was weighed and filled with 2 g flour sample, which were shaken slightly and the volume was recorded. The weight of the cylinder and the contents were measured and bulk density was calculated [30].

Bulk density ( g / ml ) = Sample weight / Sample volume

3.1.3. Measurement of Packed Density

A clean dry 10 ml measuring cylinder was filled with 2 g flour sample, which was tapped until there was no further reduction in volume (packed tightly). The packed volume was recorded and packed density was calculated [30].

Packed density ( g / ml ) = Sample weight / Packed volume

3.1.4. Water Holding Capacity (WHC)

The WHC of flour samples were measured according to [30]. Approximately, 1 g of sample was weighed into a 50 mL graduated test tube. Around 30 ml of distilled water was added and equilibrated for 18 h at ambient temperature. Supernatant was discarded and the hydrated residue was weighed. WHC was calculated using the formula:

WHC ( g / g ) = Residue hydrated weight − Residue dry weight / Residue dry weight

3.1.5. Swelling Capacity

Swelling capacity (SC) of flour samples was determined according to [30]. Approximately, 1 g of flour sample was hydrated with 50 ml of distilled water in a graduated tube and equilibrated for 18 h. Volume attained by the flour samples were measured and swelling capacity was calculated.

SC ( ml / g ) = Volume occupied by sample / Drysample weight

3.1.6. Oil Holding Capacity

Approximately, 1 g of sample was weighed into a 50 mL graduated test tube. Around 30 ml of refined sunflower oil was added and equilibrated for 18 h at ambient temperature. Supernatant was discarded and weight difference was determined to calculate the oil holding capacity (OHC) [31].

OHC ( g / g ) = Residue weight with oil − Residue dry weight / Residue dry weight

3.1.7. Measurement of Loaf Volume and Specific Volume

The bread was weighed and the volume was measured by the rapeseed displacement method [32]. Briefly, the loaf removed after 15 min from oven, was put in a metallic container with known volume (VC). The container was then topped with rapeseed, the loaf was removed and the volume of the rapeseed was noted (VR). Loaf volume (VL) was calculated according to the equation

V L ( ml ) = V C − V R

After cooling for 1 h, the same loaves were weighed (W) and specific volume was calculated, using the formula

V S ( ml / g ) = V L / W

3.1.8. Chemical Characterization

The moisture (method 925.10), ash (method 923.03), protein (N x 6.25) (960.52) (KEL PLUS digestion (KES 06 R) and distillation systems (DISTYL EM S), M/s Pelican Equipments, Tamil Nadu, India) and lipid contents (2003.05) (SOCS PLUS SCS2 R, M/s Pelican Equipments, Tamil Nadu, India) were determined according to AOAC (2005) [33]. The total dietary fiber (TDF) was determined using FIBRA PLUS FES 02 E (M/s Pelican Equipments, Tamil Nadu, India). Total carbohydrate was determined by phenol-sulfuric acid method [34] (Dubois et al. 1956). The caloric value of the breads was calculated using the Atwater factor formula, where by the major biochemical constituents were converted into calorific values using standard calorific equivalents, i.e., 5.65, 9.45, and 4.20 for proteins, lipids, and carbohydrates, respectively [35].

Calorific   value ( kcal / g ) = ( 5.65 × P + 9.45 × L + 4.20 × C ) / 100

Data were collected on reducing sugar and total sugar using Lane and Eynon method [36] and non-reducing sugar was determined using Hortwitz [37].

Non-reducing sugar ( % ) = ( total sugars % − reducing sugars % ) × 0. 95

3.1.9. Mineral Content

Wet digestion method was used for mineral digestion; and accordingly the sample (1 g) was digested (heating mantle ANTECH, AN-MSH 680, India) with 5 ml concentrated HNO3 solution at 70˚C for 30 min. After cooling, 5 ml of 30% (v/v) H2O2 solution were added. The heating was continued until clear solution was obtained. This clear solution was made up to 25 ml using deionized water. Blanks were prepared and subjected to analysis to correct final results. The mineral contents were determined by ICP-OES. The Optima 8000 ICP-OES Spectrometer (PerkinElmer, India) was used for measuring the sodium, potassium, calcium, magnesium, iron, copper and zinc. A RF power of 1500 watts, a plasma gas flow rate of 8 L/min, a shear gas flow rate of 25 L/min and a nebulizer gas flow rate of 0.7 L/min. Prepared sample solutions were introduced into the plasma using auto sampler. Nebulizer and a cyclonic type spray chamber at a flow rate of 1 ml/min. Analytical line of Na 589.021 nm, K 766.490 nm, Mg 279.081 nm, Ca 315.889 nm, Fe 259.942 nm, Cu 324.756 nm and Zn 213.861 nm, were selected and measured.

3.2. Texture Profile Analysis

After cooling the bread samples were cut in cubes of 3 cm × 3 cm size and the texture profile analysis was performed using a TA Plus Texture Analyzer (Lloyd Instruments, UK) equipped with a cylindrical probe of 50 mm in diameter (test speed: 1 mm/s, trigger force: 9.8 N and compression: 48%). All values are given as an average of three measurements and the total texture change were evaluated [38].

3.3. Crumb Color Analysis

The CIE Lab coordinate of the bread samples (crumb) were determined using Color Flex EZ (Hunterlab, USA) reporting luminosity (L*), redness (a*), and yellowness (b*). Measurements were done at nine different points within the crumb region and mean values were reported for each sample.

3.4. Sensory Evaluation

The sensory evaluation of bread samples was carried out for consumer acceptance and preference by 10-panel members, using a ten-point Hedonic Scale (1 and 10, representing extreme dislike and extreme like, respectively). Coded samples of the same size were served to participants in identical containers.

3.5. Statistics

All results are expressed given as means and standard deviation. Analysis of variance was conducted using one-way ANOVA and Tukey test by pair-wise analysis with significance defined at p < 0.05.

4. Results and Discussion4.1. Physiochemical Characterization of Bread

The pH of flours, control and carrageenan-supplemented bread, were near to neutral (6.5 and 7.5, respectively). Supplementation of carrageenan to the flour improved the hydration properties (Water holding capacity—1.33 g/g and Swelling capacity—3.5 ml/g, respectively). These results were in accordance with earlier reports [39] [40]. The enhanced hydration properties in carrageenan-supplemented bread could be due to the unique chemical structure of the hydrocolloid and its interaction with the flour [39] [40]. Hydrocolloids were reported to weakens the starch structure; thereby, improving the water distribution and retention and softens the bread [41] [8] [42]. Additionally, these modulate the gluten network and create bonds in the dough; consequently, improving the viscoelastic properties of bread to produce breads with higher volumes, better porosity and desired crumb texture [43]. Nevertheless, the oil holding capacity of the control (1.48 g/g) was higher than carrageenan-supplemented bread (1.14 g/g). Carrageenan act as fat replacers and reduce the oil uptake [42].

The size-related parameters of bread such as loaf volume, weight and specific volume indicates the baking time and temperature relationship. The specific volume, is the ratio of the loaf weight and loaf volume, is generally adopted as a more reliable measure of loaf size. Loaf volume is affected by the quantity and quality of ingredients in the flour [44] and proofing time [45] whereas loaf weight is basically determined by the quantity of dough baked and the amount of moisture and carbon dioxide diffused out of the loaf during baking. The loaf weight for control (124.83 g) is less than carrageenan-supplemented bread (140.13 g), while the loaf volume and specific volume reduced in latter (130.0 ml and 0.93 ml/g, respectively) than control (150.0 ml and 1.20 ml/g, respectively). The variation in loaf volume could be attributed mainly to different rate of gas evolution and the extent of starch gelatinization. Carrageenan incorporation possibly weakens the starch structure and softens the bread [8] [42].

The moisture percentage of white bread and carrageenan (hydrocolloid) supplemented bread were 28.6% and 29.4%, respectively. The ash contents were 1.0% and 1.5%, while the percentages of protein were 6.9% and 7.0%, respectively. The percentages of fat content for the bread were 3.0% and 4.6%, respectively (Table 1). Total carbohydrate contents were 17.8% and 15.0%, whereas the fiber content were 3.5% and 9.4%, respectively. Proximate composition analysis indicated that the supplementation of bread with carrageenan improved its fiber and mineral content. Total sugar and non-reducing sugar were significantly (p < 0.05) high in control (17.0 g% and 10.7 g%, respectively) than carrageenan incorporated bread. According to the United State Food and Drug Administration, carrageenan is considered either as food additives or generally recognized as safe (GRAS) substances [46]. Hydrocolloids have low calorific value and hence, do not add to the calories [42] [47].

Mineral contents were analyzed using ICP-OES, which indicated that carrageenan-supplemented bread had high amounts of sodium (2709.6 μg/g, 53% RDA), potassium (2565.7 μg/g, 77% RDA), magnesium (678.8 μg/g, 59% RDA), calcium (277.9 μg/g, 70% - 71% AI) and iron (63.1 μg/g, 84% RDA), which is significantly higher than control (Na: 2618.8 μg/g, 51% RDA; K: 1452.7 μg/g, 59% RDA; Mg: 235.4 μg/g, 19% less than RDA; Ca: 254.6 μg/g, 66% - 67% RDA; Fe: 51.9 μg/g, 80% RDA); copper (1.2 μg/g) and zinc (4.3 μg/g) showed significant decrease in the concentration with the supplementation of carrageenan than control (Cu: 3.3 μg/g, Zn: 6.1 μg/g) (Table 1). Supplementation of carrageenan appreciably contributes to the enrichment of micronutrients.

4.2. Color Analysis

The color analysis showed that both breads has similar values for whiteness, yellowness and redness, indicating that the color of the bread were comparable with each other (Table 2). Addition of carrageenan did not alter the L*, a* and b* values of the samples.

4.3. Texture Profile Analysis

The texture analysis indicated that both bread had similar hardness profile ranging (Hardness 1, H1: 92.3 - 92.6 N; Hardness 2, H2: 62.5 - 63.4 N). (Table 3). Springiness was high for carrageenan supplemented bread (5.3mm) than control (4.9 mm); however, the chewiness was high for white bread (7.5 kgf.mm). The sensory evaluation indicated that white bread was more preferred by the panel members than carrageenan supplemented bread. Supplementation of the bread with κ-Carrageenan or hydrocolloid affected the shape of the loaf slice. It increased the width/height ratio, thereby improving the slice shape of fresh bread. Carrageenan supplementation did not affect the crunchiness of the bread. The final baked product had higher softness than control [48]. Storage of bread under refrigeration condition indicated that bread hardness was not affected even after 24 hours. Sensory evaluation revealed the acceptability of the product and the results are shown in Table 3.

Bread represents the most important part of the total daily food consumed. Hydrocolloids such as alginate, carrageenan, etc. modify the bread texture (Figure 2) [46], improve hydration properties and dough rheology [49], and improve the shelf life by retarding the staling process [50] [42].

The decisive effects of hydrocolloids on dough and bread properties depend on several factors including molecular structure, particle size and proportion of hydrocolloids, recipe, dough and bread preparation methods and bread types [51].

5. Conclusion

Inclusion of carrageenan together with wheat flour improved the hydration

Physiochemical characterization and color analysis of white bread (control) and carrageenan supplemented white bread (Car-bread), Level of significance (p < 0.05)- a
ControlCar-bread
Physical parameters
pH6.57.5
Loaf weight (g)124.83140.13
Loaf volume (ml)150.00130.00
Specific volume (ml/g)1.200.93
Bulk density (g/ml)0.400.41
Packed density (g/ml)0.650.65
Water holding capacity (g/g)1.061.33
Swelling capacity (ml/g)2.603.50
Oil holding capacity (g/g)1.481.14
Chemical parameters (g/100g)
Moisture28.6 ± 0.429.4 ± 0.5
Ash1.0 ± 0.01.5 ± 0.3
Fat3.0 ± 0.74.6 ± 0.9
Protein6.9 ± 0.17.0 ± 0.1
Carbohydrate17.8 ± 0.515.0 ± 1.0
Fiber3.5 ± 0.39.4 ± 1.5a
Reducing sugar5.8 ± 0.06.9 ± 0.0
Non-reducing sugar10.7 ± 0.0a 8.4 ± 0.0
Total sugar17.0 ± 0.0a 15.6 ± 0.0
Mineral content (μg/g)
Sodium2618.82709.6
Potassium1452.72565.7
Magnesium235.4678.8
Calcium254.6277.9
Iron51.963.1
Copper3.31.2
Zinc6.14.3
Calories (kcal/g)1.41.5
Color analysis
L*76.4 ± 1.076.7 ± 1.0
a*1.0 ± 0.11.0 ± 0.1
b*18.2 ± 0.318.2 ± 0.3
 Texture profile analysis and sensory evaluation of white bread (control) and carrageenan supplemented white bread (Car-bread); Level of significance (p < 0.05)- a
ControlCar-Bread
Texture profile analysis (Instrumental)
Hardness1 (N)92.6 ± 14.692.3 ± 10.2
Hardness2 (N)63.4 ± 10.962.5 ± 7.3
Cohesiveness0.2 ± 0.00.1 ± 0.0
Springiness (mm)4.9 ± 0.95.3 ± 0.6
Springiness Index0.5 ± 0.10.6 ± 0.2
Gumminess (kgf)1.5 ± 0.71.2 ± 0.3
Chewiness (kgf.mm)7.5 ± 3.36.5 ± 1.6
Adhesiveness (kgf.mm)−1.3 ± 0.3−1.4 ± 0.2
Sensory evaluation
Taste7.0a 6.6
Texture7.17.0
Aroma7.8a 6.6
Crumb color7.8a 7.4
Crust color7.77.4
Overall acceptability7.5a 7.0

properties of the flour (WHC—1.33 g/g; SC—3.50 ml/g). Even though, the loaf weight (140.13 g) was high in carrageenan-substituted bread, the loaf volume (130.0 ml) reduced considerably in the same. The fat (4.6 g%) and protein content (7.0 g%) were enhanced in carrageenan-substituted bread. Carrageenan-substitution significantly improved the fiber content in the bread (9.4 g%). The mineral contents, Na, K, Mg, Ca, Fe, and Zn, were increased with the incorporation of carrageenan. The color analysis showed that carrageenan substitution did not alter the color of the product. Incorporation of carrageenan also softened the bread texture and improved the springiness. The present attempt could encourage the use of marine fibers in developing functional foods and exploiting the health benefits of these bioactive components. The use of these bioactives in composite foods will ensure nutritional efficacy and health foods for the growing population.

Acknowledgements

Acknowledgement due to Mr. Pulkit Jain, Aquarev Industries (Una, Gujarat, India) for supplying the carrageenan (food grade) sample packs. The Centre also acknowledges Dr. Anu Gopinath for her assistance in analyzing the samples for mineral contents. The authors also extend their sincere acknowledgement to Ms. Indu P. for assisting in the study.

Conflicts of Interest

The authors declare no conflicts of interest regarding the publication of this paper.

Cite this paper

Raman, M., Dinakaran, A., Ravindran, A., Sankar, T.V. and Gopal, T.K.S. (2019) Dietary Supplementation of κ-Carrageenan to Improve the Physio-Chemical and Functional Properties of White Bread. Food and Nutrition Sciences, 10, 997-1010. https://doi.org/10.4236/fns.2019.108071

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