2023.08.02.74

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Study of specific activities of phenolic compounds produced from Fungi Pleurotus Ostreatus and Agaricus Bisporus

Mallak M. Ammar^1,*

¹ Collage Basic Education, Al-Mustansiriah University, Iraq

* Correspondence: [email protected]

Available from: http://dx.doi.org/10.21931/RB/2023.08.02.74

ABSTRACT

Specific activities of phenolic compounds produced from the fruiting bodies of the fungi PO and AB (the locally produced strain in Iraq) obtained from the Department of Plant Protection - Department of Organic Agriculture - Baghdad - Iraq were studied. Then, the phenolic compounds were determined after cleaning, drying and grinding the fruiting bodies. The alcoholic extract of the two fungi was prepared by adding 0.2 g of fruiting bodies powder per (1) ml of 98% ethyl alcohol, where the mixture was filtered, concentrated and kept in the refrigerator until use. The aqueous extract was prepared by adding 25 g of fruiting bodies powder per 500 ml of boiled distilled water. Similarly, the mixture was mixed, filtered and stored in the refrigerator until use. The study findings confirmed the existence of significant differences at the probability level (P ˂ 0.05) for the alcoholic and aqueous extracts and for the fungi in the content of phenolic compounds.

Conversely, the reducing power was increased by increasing the concentrations prepared for the extracts prepared from the two fungi under study. The free radical scavenging method DPPH was used to estimate the antioxidant activity of alcoholic and aqueous extracts and of the fungi PO and AB. Thus, the results showed the superiority of ethyl acetate extract compared to the other used solvents.

Keywords: Edible fungi, phenolic compounds, reducing power, free radical scavenging.

INTRODUCTION

Food additives have always dominated the debate of researchers interested in human health due to their close relationship with most diseases, especially cancer, allergies and other diseases ⁹. Antioxidants are considered one of the essential food additives used to preserve food products and extend their storage life ¹⁸. Synthetic antioxidants such as butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT) were used to prevent the oxidation of fats in food. However, their use was limited because they produced carcinogenic substances during decomposition, confirmed by the latest studies ¹. The need has increased to replace industrial antioxidants with others from natural sources such as plants, microorganisms and fungi with fruiting bodies. These sources are safe for health and help the body reduce oxidative damage, especially phenolic compounds ¹⁹. The phenolic compounds taken from natural sources are among the most important compounds that can search for free radicals that cause oxidation ². Pleurotus ostreatus (PO) and Agaricus bisporus (AB) are good sources of vitamins, minerals, proteins, carbohydrates and unsaturated fatty acids such as oleic acid, linoleic acid, fiber, fats and sodium ⁵. Therefore, it is considered a healthy food for people with high cholesterol and high blood pressure ⁶. Researchers Cheung M. and Cheung K confirmed that edible fungi, including PO and AB, contain biologically active molecules capable of collecting free radicals from lipid oxidation, which causes most health problems. The most important of these molecules are polysaccharides, phenols, and vitamins such as vitamins A and C, and beta-carotene found in the above fungi are among the most important biologically active compounds used as antioxidants ¹⁰. Consequently, there was an urgent need to study the importance of some of the phenolic compounds that can be produced from the fungi PO and Ab, which are produced locally from our dear country, Iraq.

MATERIALS AND METHODS

Fruiting bodies of the two fungi were obtained from the Department of Plant Protection - Department of Organic Agriculture - Baghdad, Iraq. The fruiting bodies were thoroughly cleaned with distilled water, then wiped with a clean cloth and placed in a thermal oven at 40-45 °C for one day. The samples were ground with an Egyptian electric grinder from Tornado Company. The powder was then passed through a sieve whose holes are about 0.5 mm in diameter. The resulting powder was packed into polyethylene bags, and the bags were completely emptied of air and stored until use ²⁰.

Preparation of alcoholic and aqueous extract of the fungi under study

The alcoholic extract of the two fungi PO and AB was prepared separately according to the method of ¹⁶, as (0.2) g of the prepared powder was added to every 1 ml of ethyl alcohol 98% and mixed by a magnetic stirrer and left for 24 hours at 25°C. The extract was then filtered using a filter paper (0.1NO), and the filtrate was concentrated at a temperature of 40°C using a rotary vacuum evaporator. Then the resulting substance was then kept in opaque and airtight bottles and in the refrigerator until use. As for the aqueous extract was prepared according to the method of ³, as 25 g was added to every 500 ml of boiled distilled water. The mixture was stirred for 30 minutes with a magnetic stirrer and filtered with a Buchner funnel. Furthermore, the excess water was disposed of by a rotary evaporator at a temperature of 50 °C, and the filtrate was left at 25 °C to dry and kept in the refrigerator until use.

Determination of total phenolic compounds

According to the method of ^8, in preparing the standard curve for gallic acid, a stock solution was prepared by adding 0.125 g of it to 100 ml of methanol at a concentration of 50%. Different volumes of the prepared solution were taken in a set of test tubes, and 50% methanol was added to it so that the volume was 0.5 ml, as shown in Table 1. Then, Folin and Na₂CO₃ 75% reagent were added with a volume of 2.5 and 2 ml, respectively, so that the total volume of the final solution was 5 ml. The absorbance was recorded by a spectrophotometer at a wavelength of 760 nm.

Table 1. The concentrations and volumes used to prepare gallic acid

Figure 1. Graph of the standard curve of gallic acid

Preparation of alcoholic and aqueous extracts of fungi PO and AB for the determination of phenolic compounds

2.5 ml of Folin reagent was added to 0.5 ml of fungal filtrate for each fungus under study separately and left for 10 minutes at a temperature of 25 °C, then Na₂CO₃ 75% was added. The mixture was placed at 40 °C for half an hour, and the absorbance was measured at a wavelength of 760 nm.

Measuring the reducing power of alcoholic and aqueous extracts and of the fungi under study by ¹¹ mixed (1) ml of each section with 2.5 solutions of 1% potassium ferricyanide and adding 2.5 ml of 0.2 M phosphate buffer solution at PH (6.6). Then, the mixture was kept at a temperature of 50 °C for a third hour; later, trichloro acetic acid chloride (TAC) was added at a concentration of 10% and placed in a centrifuge (1900 x g) for 10 minutes. (2.5) ml of the filtrate were taken with (2.5) ml of distilled water and (0.5) ml of ferric chloride (0.1%). A control sample was prepared by preparing all the materials above to measure the reducing force, except they were free of the extracts under study. Moreover, the absorbance was measured at a wavelength of 700 nm after leaving it for half an hour. According to the following law:

Where: F = reducing power, X = absorbance reading of the control sample, Y = absorbance reading of the model.

DPPH radical-scavenging

A 0.1 mmol of 1,1-Diphenyl-2-picryl hydrazyl (DPPH) solution was mixed after dissolving it in ethanol at a concentration of 95% with (1) ml of the extract. The mixture was mixed away from light at a temperature of 25°C for a full hour until the purple color disappeared and a violet or light pink color appeared, which was determined by measuring the decrease in absorbance at a wavelength of 517 nm. The following equation was applied:

Where: C = free radical scavenging DPPH, A = absorbance for the control treatment, B = absorbance of the mixture.

The efficiency of ethyl alcohol extract in scavenging free radicals was compared with other solvents, such as hexane, chloroform, n-butanol, and ethyl acetate.

RESULTS

Determination of total phenolic compounds

The results shown in Table 2 and Figure 2 showed that there were significant differences at the probability level (p˂0.05) for the alcoholic and aqueous extracts of the two fungi PO and AB in the content of phenolic compounds, as it reached for the alcoholic extract of the two fungi (5.79 and 6.9) mgGAE/g respectively. As for the aqueous extract of the two fungi, the number of phenolic compounds was 6.12 and 7.01 mgGAE/g, respectively. These results are consistent with ⁴ when they concluded that the total phenols of the aqueous extract of PO and AB were 6.27 and 7.60 mgGAE/g.

Table 2. The total amount of phenols for the fungi under study and the alcoholic and aqueous extracts

Figure 2. The total amount of phenols for the fungi under study and the alcoholic and aqueous extracts

Determination of the reducing power

Figure 3 shows the reducing power of alcoholic and aqueous extracts of fungi PO and AB prepared at concentrations of 100, 80, 60, 40, 20, and 10 mg/ml for each sample. It is noted that the reducing power increased with increasing concentration. The concentration (100 mg/ml) showed the highest reducing power in all alcoholic and aqueous extracts, as the PO alcoholic extract had the highest reducing power of 185.9% at a concentration of 100 mg/ml. It was observed that the capacity of reducing the power of the aqueous extract of fungus PO is 162.03%. In comparison, the alcoholic and aqueous extract of the fungus AB recorded a reducing power of 149.3 and 132.02% for the alcoholic and aqueous extracts, respectively. As for the reducing power of BHA, it was recorded at 190.45, and the results of the statistical analysis recorded this, as it showed the superiority of alcoholic extracts over aqueous extracts with the same concentration.

Figure 3. The reducing capacity of alcoholic and aqueous extracts of PO AB in comparison with BHT

Determination of the antioxidant activity by DPPH free radical scavenging method

Figure 3 shows the superiority of ethyl acetate extract in free radical scavenging compared to other solvents of the two fungi, as the scavenging % of PO and AB was about 65.5% and 61.01%) respectively. However, it amounted to 31.5, 25.8 and 20.1% for butanol, chloroform and hexane extracts of the fungus PO, respectively. As for AB extract, the percentage of free radical scavenging was about 28.9%, 22.01 %, and 17.9%, respectively.

Table 3. Statistical analysis for determination of the antioxidant activity by DPPH free radical scavenging method for PO fungi extract

The statistical analysis result showed significant differences at the level (0.05) between ethyl extracts and among other extracts, as shown in Table 4.

Figure 4. Determination of the antioxidant activity by DPPH free radical inhibition method for PO extract

Table 4. Statistical analysis to determine the antioxidant activity by the method of inhibiting free radical DPPH for the AB extract

Figure 5. Statistical analysis to determine the antioxidant activity by DPPH free radical inhibition method for AB extract

The analysis of these results explained that these extracts contain antioxidant compounds that contain hydroxyl groups that give hydrogen atoms capable of interacting with free radicals, turning these radicals into more stable substances, thus ending the reaction chain of the free radical.

The difference in the number of phenolic compounds between the aqueous and alcoholic extracts may be due to the polarity of all the solvents used in the extraction and the chemical nature of the separated compounds. These results are consistent with what was reached by ⁴. However, ¹⁴ indicated that most phenolic compounds are dissolved in water as sugar-linked glycosides formed in the cell walls and contain active hydroxyl groups. The concentrations of phenolic compounds in the filtrate were calculated and compared to the standard curve for Gallic acid ⁷. The superiority of alcoholic extracts over aqueous extracts with the same concentration. This may be due to the efficiency of the solvents used to extract the active compounds ¹⁷. (Yang et al., 2020) explained that the reason is the possibility of combinations called reducing compounds that can interact with free radicals to convert them to more stable products and then end the free radical reaction chain. Figure 4 shows that the DPPH-free revolutionary scavenging method determines the antioxidant activity of alcoholic and aqueous extracts. It is one of the critical analyses to reveal the ability of the extract to prevent oxidation in the promotion stage by neutralizing or preventing free radical formation ¹². Finally, the results were confirmed by ¹⁵ that the group that donates the electron radical increases the retention of free radicals and that the independent group of the electron reduces the effectiveness of holding these radicals.

CONCLUSIONS

The fruiting bodies of the two fungi PO and AB, produced locally in Iraq, contain phenolic compounds that industrial phenolic compounds can replace.

We are increasing the reducing power capacity by increasing the concentration of the extracts prepared in the current research.

Ethyl acetate extract had the most significant effect compared to the solvents used in the research.

RECOMMENDATIONS

The production of natural antioxidants from edible fungi is guaranteed and does not contain side effects instead of synthetic antioxidants.

Acknowledgments

I want to thank Al-Mustansiriya University and the College of Basic Education for their assistance in conducting the current research.

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Received: May 15, 2023/ Accepted: June 10, 2023 / Published: June 15, 2023

Citation: Ammar, M.M. Study of Specific Activities of Phenolic Compounds Produced from Fungi Pleurotus Ostreatus and Agaricus Bisporus. Revis Bionatura 2023;8 (2) 74. http://dx.doi.org/10.21931/RB/2023.08.02.74