Asian Journal of Dairy and Food Research

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The Effect of Pre-gelatinized Rice Flour Substitution for Rice Flour on the Characteristics of Gluten-free White Bread

Tuty Anggraini1,*, Muhammad Rizky Steval1, Rina Yenrina1
1Department of Food Technology and Agricultural Products, Faculty of Agricultural Technology, Kampus Limau Manis Padang, West Sumatra-25163, Indonesia.
Background: Gluten-free white bread is made without using wheat or other gluten-containing ingredients, making it safe for consumers who are sensitive to gluten. Physical modifications, such as pre-gelatinization of rice flour, increase viscosity at cold temperatures, helping the dough trap gas produced during fermentation.

Methods: The design used for this research was a completely randomized design with five treatments and three replications. The treatments used in this research are substitutes of pre-gelatinized rice flour to the amount of rice flour where A (control), B (10%), C (20%), D (30) and D (40%).

Result: The results showed that substituting pre-gelatinized rice flour increased the bread’s specific volume, porosity, and pore count, although there was a slight decrease when the substitution exceeded 30%. The moisture content of gluten-free white bread increased with the increase in pre-gelatinized rice flour substitution, while the carbohydrate content decreased. No significant differences were found in the ash, protein, or fat content. 
White bread is a food product generally made from wheat flour, fermented with yeast, and baked to produce a hollow structure (Bouhadi et al., 2023). Wheat flour contains 70-75% starch, 14% water, 10-12% protein, 2% fat. Most of the proteins contained in flour are glutenin and gliadin, gluten-forming proteins (Goesaert et al., 2005).  Gluten is a protein formed when glutenin and gliadin are mixed with water, forming a network that provides elasticity (Gibson et al., 2018).  The elasticity produced by gluten can withstand CO2 gas produced during fermentation, resulting in good bread volume (Barak et al., 2013). However, the gluten found in white bread can cause damage to the small intestine in people with celiac disease.
       
To produce gluten-free bread that is safe for people living with celiac disease, rice flour is used instead of wheat flour because it does not contain gluten protein (Rodge et al.,  2024). Apart from not containing gluten protein, rice flour has advantages such as being bland, white, easy to digest, and hypoallergenic (Furlán et al., 2015). However, rice flour does not provide good development because it cannot hold CO2 gas well (Han dan Koh, 2023). The ability to hold CO2 gas affects the volume of bread as well as the quality and texture of gluten-free white bread (Gallagher et al., 2003). To overcome this, physical modification was carried out on rice flour, namely pre-gelatinization, to produce better gluten-free white bread.
       
Pre-gelatinization allows these products to absorb more water because the damage to the starch granules increases the absorption capacity. Ma et al., (2022) stated that physical modifications to flour, such as pre-gelatinization, can increase water absorption and viscosity in cold water. In making white bread, the viscosity of the dough can affect the characteristics of the resulting white bread.
       
In the pre-research, the researchers examined three treatments of gluten-free white bread made from rice flour with different levels of substitution of pre-gelatinized rice flour for rice flour, namely 0% substitution of pre-gelatinized rice flour for rice flour (control), 10% substitution of rice flour. Pre-gelatinization of rice flour, and 25% substitution of pre-gelatinization of rice flour for rice flour.  In the pre-gelatinized flour substitution treatment of 10%, the results were bread with bread edges that were not hard and had smaller pores and thinner pore walls. With 25% pre-gelatinized flour substitution, bread results were obtained with bread pores that were more evenly distributed and thinner pore walls than in treatments with lower substitution levels. Based on the description above, researchers want to conduct research entitled “The Effect of Pre-Gelatinized Rice Flour Substitution for Rice Flour on the Characteristics of Gluten-Free White Bread.”
The experiment was conducted  from October until November 2024 in the Laboratory of Instrumentation, Faculty of Agricultural Technology, Andalas University, West Sumatra, Indonesia. The tools used in this research are a rice cooker, food dehydrator, mixer, rapid visco analyzer, scanning electron microscope, oven, and proximate analysis glassware. The ingredients used in this research were rice, Fermipan yeast, Blue Band margarine, mineral water, sugar, and salt. The chemicals used for analysis are distilled water, 30% NaOH solution, 0.02N HCl, methyl red indicator (mm); methyl blue (MB), H2SO4, selenium catalyst, nonpolar organic solvents, alcohol, filter paper, and other chemicals used for analysis.
       
The design used for this research was a completely randomized design with five treatments and three replications. The data obtained were analyzed statistically with the F test, and if significantly different, they were continued with Duncan’s new multiple range test (DNMRT) at the 5% level. The treatments used in this research are substitutes of pre-gelatinized rice flour to the amount of rice flour where A (control), B (10%), C (20%), D(30) and  D(40%).
 
Research procedure
 
Making rice flour
 
Making rice flour is done by drying rice at a temperature of 80oC for 4 hours in a food dehydrator. After drying, the rice is reduced using a grinder and sifted using an 80-mesh sieve.
 
Making pre-gelatinized rice flour
 
Pre-gelatinized rice flour is made by cooking or gelatinizing the rice using water in a ratio of 1:1, cooked using a rice cooker at a temperature of 70oC for 30 minutes. Then, it dried at a temperature of 80oC for 4 hours in a food dehydrator; after drying, it was reduced in size using a grinder and sieved using an 80 mesh sieve.
 
Making gluten-free bread
 
Making gluten-free white bread begins by mixing rice flour, pre-gelatinized rice flour, sugar, salt, and yeast. Next, add water slowly while stirring using a mixer. Then, add margarine to the mixture while stirring it with a mixer. After the mixture has been mixed, the mixture is fermented for 30 minutes. The fermented dough is transferred into a mold and proofed for 40 minutes. The oven is preheated before the dough is baked to a temperature of 180oC. When the oven temperature has reached 180oC, the proofed dough is baked at 180oC for 30 minutes. After that, baking was continued at 200oC for 20 minutes. The formulation of the ingredients used in making gluten-free white bread can be seen in Table 1.

Table 1: Formulation of gluten-free white bread ingredients.


 
Microstructural analysis of starch granules (Qin et al., 2021).

Sample photomicrographs were taken using a Scanning Electron Microscope (SEM). Samples of 1-5 mg that had been dried were then coated with gold and observed at a magnification of 100x-1000x. The gold coating was carried out on non-conductive samples to produce clear images.
 
Fourier transform infraRed (FTIR) analysis
 
FTIR analysis is conducted using the method from (Bhuiyan et al., 2024). The sample FTIR analyzed was rice flour with different carrier materials. Fifteen milligrams of the sample are prepared and ground with 300 mg of dry KBr (p.a.) in a mortar until homogeneous. The mixture is then placed into a KBr die. A pressure of 10 x 10,000 kg (equivalent to 10 tons) is applied to form a pellet. The sample is then analyzed by FTIR over a wave number range of 400-4500 cm-¹ and compared with literature data.
 
Analysis of pasting properties
 
The pasting properties of the samples were observed using a Rapid ViscoAnalyzer starting from 45oC for 1 minute, then increasing the temperature to 95oC (with a heating speed of 12oC/minute) within 3 minutes and 42 seconds, maintained for 2 minutes and 30 seconds. Cooled to 45oC in 3 minutes and 48 seconds and the process was terminated in 13 minutes. The results obtained are in the form of a graph of viscosity values for each temperature change.
 
Specific volume analysis
 
The specific bread volume analysis is determined from the ratio between the volume and weight of the bread. Bread volume was measured using the displacement method, where rice was used as the measuring medium. The volume of rice without bread is compared with the volume of the container containing bread to obtain the bread volume through the difference.
 
Bread pore analysis
 
In bread pore analysis, the number of bread pores and bread porosity is calculated by analyzing bread images using the Image J application. Bread porosity is the ratio of the amount of space in the bread, which can be calculated in 2 or 3 dimensions. Porosity is calculated in 2 dimensions from the ratio of the total pore area of   the bread to the bread area obtained after analyzing the image in the Image J version 1.54 k application.
 
Proximate analysis
 
Proximate analysis is carried out to determine water, ash, protein, fat and carbohydrate content. Water content was analyzed using the gravimetric method by measuring the weight loss after drying at a temperature of 105oC to constant weight. Ash content is also determined gravimetrically by burning the sample at a temperature of 600oC until white ash remains. Protein content was calculated using the Kjeldahl method through digestion, distillation, and titration, while fat content was measured using the Soxhlet method using hexane solvent. The carbohydrate content is calculated by the difference from 100% to the total water, ash, fat and protein content.
Analysis of raw material
 
Microstructural analysis of starch granules
 
The results of observing starch granules using SEM in Fig 1a show that the structure of the starch granules in rice flour is polyhedral in shape. This shape is a general characteristic of starch granules in rice. According to Zhang et al., (2023), different types of rice still have the same starch granule shape, namely polyhedral.

Fig 1: a) Rice flour starch granules, b) Pre-gelatinized rice flour starch granules at 1000x magnification.


       
Meanwhile, Fig 1b shows that the structure of the starch granules in pre-gelatinized rice flour is damaged, loses its polyhedral shape, and forms an irregular matrix. Damage to the starch granule structure occurs due to the gelatinization process in the pre-gelatinized flour. When the gelatinization process of starch granules is heated in water, the starch granules swell and then burst at higher temperatures, resulting in changes in the structure of the starch granules, which provide different water absorption properties (Gopadile et al., 2024). The irregular structure (crystalline) of starch granules that have been damaged makes the shape of the starch granules irregular, making it easier for water to penetrate the starch granules, thereby increasing the absorption capacity of the starch granules (Jia et al., 2023).
       
The changes that occur in the starch granules in pre-gelatinized flour, which can be seen in Fig 1b, occur due to the damage to the starch granule structure; the amylose molecules interact with each other to form a gel and can no longer return to their original granule form (Richardson et al., 2004). Pre-gelatinized rice flour has irregular starch granules, making it easier to hydrate. This allows rice flour to absorb water at cold temperatures. Starch granules’ high hydration level increases absorbency and viscosity (Cornejo-Ramírez et al., 2018).
 
FTIR analysis
 
FTIR was used to analyze rice flour compounds before and after pre-gelatinization treatment, as seen in Fig 2. The same peak was detected in both samples at 3000-3500 cm-¹ and 1500-2000 cm-¹, indicating no significant difference in chemical composition between regular rice flour and pre-gelatinized rice flour. At 3000-3500 cm-¹, the broad peak reflects the stretching vibration of the O-H groups, related to the presence of hydroxyl groups and hydrogen bonds in starch. This shows that even though the gelatinization process occurs, the basic chemical structure of the hydroxyl groups in the starch molecules does not change.

Fig 2: FTIR graph of rice flour and pregelatinzed rice flour.


       
At waves of 1500-2000 cm-¹, the peaks that appear are associated with the vibration of minor functional groups, such as proteins and lipids (Kong and Yu, 2007). The peak positions and intensities in these bands were similar for both samples, indicating that pre-gelatinization treatment did not significantly change the primary or secondary structure of the protein. The similarity in these waves confirms that the pre-gelatinization process does not cause the formation of new chemical groups or significant molecular changes in rice flour. This suggests that pre-gelatinization influences physical properties, such as granule structure and hydration, more than the basic chemical structure of the flour.

Analysis of pasting properties
 
Table 2 show the pasting properties of rice flour. Rice flour has a peak viscosity value of 4712 cP with a peak time of 9.47 minutes. The rice flour pasting properties graph in Fig 3 shows several stages: peak viscosity, breakdown viscosity, and final viscosity. This is similar to the results obtained by Copeland et al., (2022) on the pasting properties graph for rice flour, which has peak viscosity, breakdown viscosity and final viscosity. The pattern formed from this graph shows the process of swelling of starch granules, increasing viscosity.

Table 2: Pasting properties of flour.



Fig 3: Specific volume of gluten-free white bread with different levels of pre-gelatinized rice flour substitution.


       
On the other hand, pre-gelatinized rice flour produces a different graphic pattern, as seen in Table 2. In this graph, pre-gelatinized rice flour shows no peak or breakdown viscosity. The viscosity is already formed at cold temperatures and increases gradually without decreasing. This phenomenon can be explained by the gelatinization process, which changes the structure of starch granules. When the temperature increases, the starch granule structure breaks down, resulting in a decrease in viscosity (breakdown viscosity). However, in pre-gelatinized rice flour, the previous gelatinization process has caused permanent damage to the starch granules. This damage allows pre-gelatinized rice flour to absorb water and form viscosity at cold temperatures without experiencing viscosity breakdown because no longer intact granules can break. The damage to starch granules during the gelatinization process carried out on pre-gelatinized rice flour gives pre-gelatinized rice flour the characteristics of absorbing water and producing viscosity at cold temperatures  (Nakorn et al., 2009).
       
The characteristic of pre-gelatinized rice flour, which can form viscosity at cold temperatures, provides benefits in making white bread, especially in helping trap gas produced during fermentation So that it can produce better characteristics of white bread. However, a too-high viscosity results in the dough being too thick, making the dough stiff so that gas during fermentation is challenging to trap. Dough that is too stiff can reduce the volume of the bread because it loses the ability to trap gas effectively (Waziiroh et al., 2021).
 
Analysis product
 
Specific volume analysis
 
Based on Fig 3, it can be seen that as the substitution of pre-gelatinized rice flour for rice flour increases, the specific volume of gluten-free white bread increases. The increase in specific volume shows that the density of gluten-free white bread decreases, which indicates that gluten-free white bread is more hollow and lighter. This decrease in density occurs because gluten-free white bread traps more air, which increases the bread’s volume. The substitution of pre-gelatinized rice flour, which can absorb cold water, contributes to the viscosity of the dough, which plays an important role in increasing the ability of the dough to trap gases produced during fermentation. 
       
When the pre-gelatinized flour substitution exceeded 20%, a specific volume decreased, indicating an increase in the density of gluten-free white bread. This decrease is caused by the dough’s viscosity being too high so that the dough becomes too thick and less elastic, inhibiting the dough from expanding during fermentation. As a result, the dough’s ability to trap gas decreases, which makes the bread volume smaller. On the other hand, a viscosity that is too low can also cause a dense bread structure because the dough loses the ability to hold gas, which ultimately reduces the volume of the bread (Waziiroh et al., 2021). Although the specific volume of gluten-free white bread obtained increased, this result differs significantly from the specific volume of white bread made from wheat flour. Based on research by Pham et al., (2005) and Iacovino et al., (2024), white bread made with wheat flour has a specific volume ranging from 2 to 4 ml/g.
 
Bread pore analysis
 
The analysis results show that the bread porosity obtained ranges from 17.65-28.05%, as seen in Fig 4. Bread porosity increases with increasing substitution of pre-gelatinized rice flour from 0% to 20%.

Fig 4: Bread porosity in gluten-free white bread with different levels of pre-gelatinized rice flour substitution.


       
This decrease is caused by too much pre-gelatinized flour, causing excessive water absorption and making the dough too thick and less flexible. The number of bread pores also showed significant changes along with increasing substitution of pre-gelatinized rice flour, as seen in Fig 5, with pores ranging from 63.33-484.33. The number of pores increased at rice flour substitution levels of up to 30%. This increase can occur due to adequate viscosity for good gas-trapping power, which supports effective gas distribution and trapping during fermentation.

Fig 5: Number of bread pores in gluten-free bread with different levels of pre-gelatinized rice flour substitution.


 
Proximate analysis
 
As seen in Table 3, pre-gelatinized rice flour can absorb water better in cold conditions because hydrogen bonds in starch molecules are broken during the gelatinization process, damaging the structure of starch granules. The gelatinization process causes the starch to swell. It causes damage to the starch granules, making their structure irregular and providing access for water to bind with the starch, thereby increasing water absorption (Jia et al., 2023). As a result, more water molecules bind to the starch granules, making it more difficult for the water in the bread to evaporate during the baking process.

Table 3: Results of proximate analysis of gluten-free white bread at different levels of pre-gelatinized rice flour substitution.


       
Rice, as the flour used in gluten-free white bread, contains minerals such as magnesium, zinc, iron, potassium, calcium, manganese, and copper, which can be found in rice  (Summpunn et al., 2023).  Lack of mineral intake such as magnesium, zinc, copper, and iron can reduce the ability of the immune system or even interfere with controlling inflammation throughout the body (Weyh et al., 2022).
       
The proteins in rice flour are divided based on their solubility: around 4-6% albumin, 6-13% globulin, 79-83% glutelin and 2-7% prolamin (Jayaprakash et al., 2022).  Even though rice flour has a relatively low protein content, rice flour is the primary source of protein content in this gluten-free white bread. Protein levels measured in various treatments of gluten-free white bread showed that there were no significant differences between treatments, as seen in Table 3, with protein content values ranging from 2.49-3.22%.
       
In the fat content analysis, the main source of fat content in gluten-free white bread comes from additional ingredients such as margarine and rice flour. As the main source of fat content in white bread, Margarine plays a role in the stability of the gas bubbles produced in white bread dough during fermentation (Renzyaeva, 2013). It can be seen in Table 3 that the results of the analysis of fat content in gluten-free white bread show that there is no significant difference between various levels of pre-gelatinized rice flour substitution with fat content values ranging from 0.62-0.92%.
       
In the carbohydrate analysis, it can be seen in Table 3 that the results of the carbohydrate content analysis show a decrease in carbohydrate content along with increasing substitution of pre-gelatinized rice flour with carbohydrate content values ranging from 52.41-57.46%. The gelatinization  that pre-gelatinized flour has undergone causes the granule structure to be damaged, which changes the shape of the starch granules to become irregular and increases their surface area, causing the absorption capacity to increase (Liu et al., 2017) in line with the statement of Jia et al., (2023), which states that gelatinization destroys the crystalline (ordered) structure of starch granules, turning them into irregular structures and providing more free hydroxyls that can bind with water. This means that the starch can retain more water molecules so that the water content increases as pre-gelatinization rice flour increases, as seen in Table 3.
Based on the results of the research that has been carried out, it can be concluded that increasing the substitution of pre-gelatinized rice flour has a real influence on the specific volume, bread porosity, number of bread pores, water content, and carbohydrate content in gluten-free white bread. The pre-gelatinized rice flour substitution level of 30% is gluten-free white bread with the most optimal characteristics, with a specific volume of 1.26 cm3/g, porosity of 27.32% and a number of bread pores of 484.33. 
The present study was supported by the Faculty of Agricultural Technology, Andalas University number 01J/PL/PN- UNAND/FATETA-2024.
 
Disclaimers
 
The views and conclusions expressed in this article are solely those of the authors and do not necessarily represent the views of our affiliated institutions. The authors are responsible for the accuracy and completeness of the information provided, but do not accept any liability for any direct or indirect losses resulting from the use of this content.
 
Informed consent
 
No animal testing in this research.
The authors declare that there are no conflicts of interest regarding the publication of this article. No funding or sponsorship influenced the design of the study, data collection, analysis, decision to publish, or preparation of the manuscript.

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