Research Article | Volume: 10, Issue: 1, January, 2022

Fortification of soy milk with prebiotic natural ß-glucan derived from edible mushrooms Pleurotus ostreatus and Agaricus bisporus

Kumaresan Kuppamuthu Swathi Gopalakrishnan Raghuvandhanan K. Sivasamy Thirumurugan Alagu Sathishkumar Thiyagarajan   

Open Access   

Published:  Jan 07, 2022

DOI: 10.7324/JABB.2021.100119
Abstract

Hot water extraction of edible mushrooms Pleurotus ostreatus and Agaricus bisporus at 90°C for 4 hours yielded a polysaccharide fraction containing crude β-glucan. Qualitative and quantitative analyses of the samples were carried out to identify the presence and abundance of carbohydrates. Diethylaminoethyl (DEAE) Sephacel column chromatography followed by affinity chromatography in an agarose-bound Concanavalin A column resulted in purified β-glucan. β-glucan was confirmed through the presence of unique functional groups present in it by using the Fourier transform infrared spectrum technique. Soy milk fortified with β-glucan was formulated, and this can alleviate the rate of obesity and related diseases caused by high calorific carbonated beverages. The further scope of the study involves sensory analysis and commercialization of the product.


Keyword:     Fortification β-glucan prebiotics Pleurotus ostreatus Agaricus bisporus soy milk


Citation:

Kumaresan K, Gopalakrishnan S, Sivasamy RK, Alagu T, Sathishkumar T. Fortification of soy milk with prebiotic natural β-glucan derived from edible mushrooms Pleurotus ostreatus and Agaricus bisporus. J Appl Biol Biotech. 2022;10(01):157-163.

Copyright: Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike license.

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1. INTRODUCTION

High calorific carbonated beverages are the most popular drinks in the present-day young generation. This is attributed to the fact that it is presented with many value additions like natural flavors, vitamins, minerals, and caffeine. Weight gain, hunger response stimulation, and ghrelin release-induced obesity are said to be the effects of carbon dioxide present in a lot of beverages [1]. The sudden increase in type 2 diabetes and obesity rate among people is directly linked to the consumption of these beverages. This is mainly due to the excess non-satiating sugar content present in these drinks [2]. These beverages are placed last or in level six in US guidance systems for beverage consumption. This system of grading beverages is based on their relative caloric content, health, nutritional benefits, and hazards [3]. The flavored milk available in the market is sweetened by the addition of artificial high caloric sweeteners. These artificial sweeteners are the leading cause of obesity and other health hazards [4].

Soy milk-based beverages can be touted as a healthier alternative for these high caloric beverages. Soy milk itself is a natural source of fats, proteins, carbohydrates, and some of the essential nutrients [5]. It is produced from soaked soybean. Plant-based milk serves as one of the substitutes for milk from cows, providing nutrients for lactose intolerant individuals and to people that are allergic to cow milk proteins [6]. The hypolipidemic effect of soy milk is gaining interest for its prospective role in lipid metabolism along with high-quality proteins, saponins, polyunsaturated fatty acids, phytosterols, isoflavones, and soy lecithins, and a variety of nutrients [7]. The lipid profiles of hypercholesterolemia patients can be improved with daily consumption of ≥25 g of soy protein with its supplementary phytochemicals [8]. The soy milk consumption also showed a notable increase in the quantitative insulin sensitivity check index and a significant decrease in the insulin resistance score - Homeostatic Model Assessment of Insulin Resistance (HOMA-IR), and serum insulin level, which had beneficial effects on Systolic blood pressure (SBP), and Diastolic blood pressure (DBP) in patients with Nonalcoholic fatty liver disease (NAFLD) [9]. Perfect value addition in terms of nutrients and flavor will boost its marketability across all cohorts. Value addition to soy milk is highly favored by its ability to act as a vector for carrying many flavors, vitamins, and minerals. Furthermore, the fortification is easier and it can be consumed regularly and consistently.

The selection of fortificants plays a substantial role in the marketability of the product. Proper choice of the chemical structure of the fortificant is based on its cost, bioavailability in diet, and customer’s acceptance of the sensory changes in the food. In this context, β-glucan, a soluble dietary fiber, presents in various natural sources such as plants, certain cereals, fungi, and algae can be an excellent choice of fortificants [10]. Besides being a good choice of fortificant, β-glucan can also act as a prebiotic element in the drink [11]. This non-digestible polysaccharide is a potential diabetic [12], cholesterol level regulator [13], has immune-modulating effects, and prevents obesity [14]. A good quality β-glucan can be extracted from various sources, but obtaining it from edible mushrooms makes it ideal to be added as a fortificant. Mushrooms have a variety of polysaccharides such as hemicellulose, galactans, mannans, xylans, chitin, and glucans [14]. Most cultivated mushroom species like Pleurotus ostreatus and Agaricus bisporus contain high protein and polysaccharides (glucans) [15,16]. Mushroom-derived polysaccharide exhibits immunomodulation, antioxidant, anti-inflammatory, and analgesic properties [1719]. The use of palm sugar as a natural sweetener could be an excellent alternative considering the effects of artificial sweeteners. Palm sugar contains insoluble fibers, which increases the drink’s prebiotic activity and imparts a flavor to the drink [20]. This study is concerned about the source and significance of β-glucan and its impact as a fortificant for soy milk.


2. MATERIAL AND METHODS

2.1. Sample Collection and Preparation

Pleurotus ostreatus was purchased from Grand Fresh Mushroom Farm located in the Western Ghats of Kerala. Agaricus bisporus was purchased from a local market, Sri Vinayaga Mushroom in Coimbatore, Tamil Nadu. Caps and stems of 75 g P. ostreatus and 65 g A. bisporus were subjected to shade drying and then powdered using a mixer. The powdered mushrooms were sieved to remove impurities and were taken for further analysis. Dried soybeans (glycine max) were collected from a local market in Coimbatore, Tamil Nadu. About one cup of dried soybeans was soaked in a fivefold volume of distilled water for 18 hours at room temperature [21], blended with 3× ultra-pure water, and strained to collect soymilk. The palm sugar used as an alternative for artificial sweeteners was procured from local farms.

2.2. Hot Water Extraction

A quantity of 7 g each of the prepared samples of P. ostreatus and A. bisporus was suspended in sterile water in the ratio of 1:10 w/v. Hot water extraction of polysaccharides was carried out for 4 hours at 90°C [22]. The samples were drawn out at 1-hour intervals and the resultant slurry was cooled to room temperature and centrifuged at 10,000 rpm for 30 minutes. The supernatant containing water-soluble polysaccharides was filtered through a paper filter, and the filtrate was concentrated using a rotary flash evaporator. The concentrated extract was powdered using a lyophilizer (Sub-Zero, Chennai). In total, 4.78 g was obtained and this was used for further tests.

2.3. Qualitative and Quantitative Tests

0.1 g of mushroom extract was made up to 1 ml with distilled water and was subjected to qualitative analyses such as Molisch’s test, Barfoed’s test, and Benedict’s test to confirm the presence of carbohydrates (polysaccharide extract) in the sample. Iodine test was carried out to confirm the absence of starch in the polysaccharide extract. Di-nitro salicylic acid tests [23] and phenol sulfuric acid test [24] were carried out to estimate the amount of reducing sugars and total carbohydrates present in the sample.

2.4. DEAE Chromatography

To remove the proteins in the sample obtained from hot water extraction, the concentrated extract was subjected to DEAE chromatography Sephacel column. For this, 1 g of recovered supernatant was dissolved in 100 mL of distilled water and neutralized with 2M NaOH. In DEAE sephacel anion exchange column, the unbound fraction containing glucan was separated with 3-bed volumes volumes of 10 mM phosphate buffer at pH 8.0.

2.5. Affinity Chromatography in Agarose-Bound Concanavalin A Column

Con A agarose appears to selectively remove contaminants like mannan and glycosylated proteins from the sample [25]. The eluted glucan from the Sephacel column was applied to the Con A column (1.5 × 10 cm, Aristogene, Bangalore) to remove mannan from the glucan. The sample was concentrated using a rotary evaporator and then dissolved in 10 ml of 50 mM phosphate buffer (pH 7.4) containing 0.15 M NaCl. The unbound fractions (glucan) were eluted with 50 ml of the buffer prepared with autoclaved distilled water and collected as separate fractions. 50 ml phosphate buffer (pH 7.4) containing 0.5 M methyl mannoside and 0.25 M NaCl was used to elute the bound mannan in the column and to regenerate it [25].

2.6. Fourier Transform Infrared Spectrum (FTIR) Analysis

FTIR (Shimadzu, Japan) analysis was carried out to visualize bonds present in the molecule. The identical infrared spectrum will not be produced by two exclusive molecular structures. This makes FTIR spectroscopy beneficial for several analyses. Therefore, the pure β-glucan extract obtained was subjected to FTIR analysis and functional groups were analyzed to confirm the presence of β-glucan [26].

2.7. Preparation and Formulation of Value-Added Milk

About one cup of dried soybeans was soaked in a fivefold volume of distilled water for 18 hours at room temperature [21], blended with 3× ultra-pure water, and strained using a muslin cloth to squeeze the soymilk out. Furthermore, it was heated over a low flame and brought to a boil, after which flavor, salt, and palm sugar were added and it was kept at a simmer for 20 minutes to mellow out the flavors. Palm sugar was added to soy milk as a natural sweetener. A purified β-glucan sample was added to soy milk in the ratio of 1:40. Palm sugar was ground and varied concentrations were added based on the degree of sweetness and aesthetics. 0.5 g of iodized salt per 100 ml was also added to enhance the taste.


3. RESULTS AND DISCUSSION

Fresh P. ostreatus and A. bisporus were purchased and shade-dried. The dry weights were found to be 30.6% and 28.3% of the original weight. The dried samples were then powdered. Shade drying was preferred because, in other drying methods, the possibility of components loss from the substances is high and in order to preserve the carbohydrate content [27]. Mushroom has the property of losing their color and texture when exposed to direct sunlight. Therefore, shade drying is preferred over sun drying in the case of mushrooms. Shade drying also ensures a good end product appearance to the mushroom species [28]. Hot water extraction of the mushroom sample was carried out for 4 hours. The samples were drawn at 1-hour intervals, and it was found that no charring occurred even after 4 hours of the extraction procedure. Since the extract has to be used in the food industry, no types of organic solvents were used as organic solvents are generally considered to be hazardous. Besides, this extraction procedure yielded a high amount of crude polysaccharides. The obtained recovery was 68.3%.

Figure 1: The graph represents the optimized time for hot water extraction of P. ostreatus.

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Figure 2: The graph represents the optimized time for hot water extraction of A. bisporus.

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3.1. Qualitative Tests

Molisch’s, Barfoed’s, and Benedict’s tests yielded positive results signifying that it is a carbohydrate. The results obtained were in accordance with previous literatures [2931]. Since β-glucan is a non-starch polysaccharide, it is crucial to test the absence of starch to continue working for large-scale industrial production of value-added milk. Therefore, iodine test was carried out and yielded a negative result which was formerly reported [32,33], thereby confirming the absence of starch in the hot water sample.

3.2. Quantitative Estimation

The carbohydrate concentration in the samples was found using the standard graph. Based on the concentration, the time was optimized for hot water extraction (Figs. 1 and 2) and the maximum release of carbohydrate was found to be in the third hour for both mushrooms. Furthermore, the concentration of total carbohydrates was found to be higher in A. bisporus than P. ostreatus (see Figs. 1 and 2).

3.3. Purification of Polysaccharide Extract

The sample was purified using DEAE chromatography. After recovering the unbound samples containing glucan from the column, elution of the residual proteins was accomplished by adding phosphate buffer to the sample. The potassium and chloride ions present in the buffer will attach to the resins and expel the proteins out of the column [25]. Quantitative estimation of the residual proteins eluted from the DEAE column by Folin–Lowry’s method was carried out to ensure the removal of protein from the sample. This is shown in Figure 3. DEAE chromatography method was preferred because of its high protein-binding capacity, good sensitivity, and minimal sample loss over the other purification techniques. Furthermore, to get purified β-glucan, affinity chromatography in agarose-bound Concanavalin A column was carried out to separate the residual mannan found along with glucan.

Figure 3: Protein measurements carried out by using ion exchange DEAE Sephacel column.

[Click here to view]

Figure 4: FTIR analysis of the β-glucan extract from A. bisporus.

[Click here to view]

Figure 5: FTIR analysis of the β-glucan extract from P. ostreatus.

[Click here to view]

Table 1: Comparison of main peaks of the FTIR spectra of A. bisporus and P. ostreatus.

[Click here to view]

3.4. FTIR Analysis

The FTIR obtained for the third-hour samples implies presence of Carbohydrates (See Figs. 4 and 5). The broadband between approximately 3,600 and 3,200 cm−1 is the result of stretching vibrations of O–H in the sugar residue of polysaccharides. The intense absorption at 3,000–2,700 cm−1 corresponds to medium stretching vibrations of C–H which is a characteristic of carbohydrates. Infrared spectroscopy was applied for the structural characterization of β-glucan [26]. A comparison of main peaks of the FTIR spectra of A. bisporus and P. ostreatus is given in Table 1. A similar FTIR spectra has been obtained by other authors [3436] about the structure of β-glucan.

3.5. Formulation of Value-Added Milk

2.5 g of the purified β-glucan samples from P. ostreatus and A. bisporus were taken together and were added to the soy milk in the ratio of 1:40. Palm sugar was ground and varied concentrations were added to it. Based on the aforementioned criteria, the optimal (based on color change) palm sugar concentration was 25 mg per 100 ml of the soy milk and glucan mixture.


4. CONCLUSION

In the present study, hot water extraction was carried out which yielded a high concentration of polysaccharides at the third hour of treatment. The extract obtained was then purified by DEAE chromatography, followed by affinity chromatography. The purified samples were subjected to FTIR analysis and the results confirmed the presence of β-glucan. The samples containing β-glucan were then added to milk containing palm sugar to produce value-added milk having significant health benefits. Moreover, the leftover part after extraction can be an excellent value addition for other food products like mayonnaise. This study can be further extended in the future by carrying out sensory analysis of the product and then successfully bringing out the product into the market for consumer acceptance.


5. ACKNOWLEDGMENT

The authors would like to thank the management of Kumaraguru College of Technology, Coimbatore, Tamil Nadu, for providing research facilities and resources to carry out this research.


6. AUTHOR CONTRIBUTIONS

All authors made substantial contributions to conception and design, acquisition of data, or analysis and interpretation of data; took part in drafting the article or revising it critically for important intellectual content; agreed to submit to the current journal; gave final approval of the version to be published; and agree to be accountable for all aspects of the work. All the authors are eligible to be an author as per the international committee of medical journal editors (ICMJE) requirements/guidelines.


7. FUNDING

There is no funding to report.


8. CONFLICTS OF INTEREST

The authors report no financial or any other conflicts of interest in this work.


9. ETHICAL APPROVALS

This study does not involve experiments on animals or human subjects.


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