Antibacterial and Antioxidant Activity of Black Mulberry (Morus nigra l.) Extract for Acne Treatment

ORIGINAL ARTICLE

Pharmacognosy Journal |Year 2017 | Volume 9 | Issue 5 |Page 611-614

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Arif Budiman1*, Diah Lia Aulifa2, Arif Satria Wira Kusuma1, Astri Sulastri1

1Departement of Pharmaceutical and Technology Pharmacy, Universitas Padjadjaran Jatinangor, INDONESIA.

2Sekolah Tinggi Farmasi Indonesia, Jl. Soekarno Hatta No. 354, Bandung, INDONESIA.

Correspondence:

Arif Budiman, Departement of Pharmaceutical and Technology Pharmacy, Universitas Padjadjaran, Jatinangor, INDONESIA.
Tel.: 45363 Telp/Fax: 022-7796200
E-mail: arif.budiman@unpad.ac.id

History

  • Submission Date: 14-03-2017;

  • Review completed: 28-03-2017;

  • Accepted Date: 30-05-2017

DOI : 10.5530/pj.2017.5.97

Article Available online

http://www.phcogj.com/v9/i5

Copyright

© 2017 Phcog.Net. This is an openaccess article distributed under the terms of the Creative Commons Attribution 4.0 International license.

ABSTRACT

Introduction: Black mulberry is rich in phenols and is hence usable in the treatment of acne. It also contains anthocyanin, a well-known antioxidant. This study aimed to examine the antibacterial and antioxidant properties of black mulberry (Morus nigra L.) extract as a potential raw material for use in beauty care products. Method: Fruit extract was obtained using maceration method with 96% ethanol. The antibacterial activity of the extract was determined by disc diffusion method, while the minimal inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined by microdilution method. Furthermore, the antioxidant activity of the extract was tested by DPPH method. Result: The results showed a 2.5% MIC against S. epidermidis and P. acnes, confirming the antibacterial activity of black mulberry extract. The MBC values for the respective bacterium were 2.5% and 5%. Regarding antioxidant activity, the IC50 value of black mulberry extract was 146.731 mg/mL, suggesting its medium potential. Conclusion: Morus nigra extract has antibacterial activity against S. epidermidis and P. acnes, and has medium potential as antioxidant.

Key words: Morus nigra extract, Antioxidant, Anti acne, Staphylococcus epidermidis, Propionibacterium acnes.

INTRODUCTION

Our skin protects the body from environmental influences such as ultraviolet rays of the sun and numerous microbes.1 A notable influence of the environment on our skin is premature aging and acne. Premature aging is usually caused by frequent exposure to ultraviolet rays.2 Ultraviolet rays can cause skin burn3 and trigger the formation of free radicals more quickly.4

Acne is an inflammatory disease of the skin that often occurs in adolescence.5,6 One of the factors that cause acne on face is due to the activity of bacteria. Propionibacterium acnes and Staphylococcus epidermidis, the two normal skin flora, are often isolated from lesions of acne7.

Black mulberry (Morus nigra) contains the highest total phenolic compounds compared to the species of another genus Morus and has antibacterial and antioxidant activity.8,9 2-arylbenzofuran (Moracin M) has known antibacterial activity against Streptococcus faecalis (MBC 500 μg/mL), and oxyresveratrol stilbenoid against Staphylococcus aureus (MBC 125 μg/mL).10 Mulberry fruits are a rich source of flavonoids and anthocyanin compounds as antioxidant.9,11,12

MATERIALS AND METHODS

Materials

The materials used in this study consisted of Black Mulberry fruit obtained from Plantations in Cibodas, Maribaya-Lembang, 1.1-diphenyl-2-picrylhydrazyl (DPPH) (Sigma Aldrich), glycerin (Brataco Chemical), hydroxypropyl methylcellulose (HPMC) (Brataco Chemical), Mueller Hinton Agar (Merck), Mueller Hinton Broth (Merck), saline (Otsu-NS), ethanol 96% (CV Sarana Abdi Bakti), Dimethyl Sufoxide (DMSO) (Merck), P. acnes and S. epidermidis bacteria from the Laboratory of Microbiology, Faculty of Pharmacy University of Padjadjaran.

The tools used in this study is the incubator (Yenaco), magnetic stirrer (Yellow-MAG HS7), mechanical stirrer (IKA EUROSTAR), micropipette (Socorex), ovens, pH meters (108 pH ATC), analytical balance (OHAUS TM-Adventure), Viscometer Rion (VT 04F), UV-Vis Spectrophotometry Analytik Jena Specord.

Extraction

Black mulberry was dried to a final weight of 10 kg in an oven at a temperature of 50°C 13,14 and extracted by maceration method using 96% solvent ethanol twice for 24 hours at room temperature. A viscous extract was obtained using a rotatory evaporator under vacuum at 50°C.

Phytochemical Screening

Phytochemical screening of ethanol extract Black Mulberry fruit (Morus nigra) was tested for the presence of alkaloids, steroids/ triterpenoids, saponins, polyphenols, tannins, flavonoids, quinones, monoterpenoid, and sesquiterpenoids.

Antibacterial activity

The antibacterial activity was tested by disc diffusion method. The growth medium used was Mueller Hinton Agar. Firstly, the extract was dissolved in 0.01% DMSO to obtain four concentrations: 10%, 20%, 40%, and 80%. A 6 mm diameter paper disc was soaked in 5 mL of the extract for 15 minutes and then dried in a laminar flow cabinet for 2 hours. The paper discs were then placed on the surface of the media containing inoculated bacteria. The Petri dishes were incubated at 37°C for 18 hours15,16.

Determination of MIC and MBC

MIC and MBC were determined by micro-dilution method using a microplate17. 100 mL MHB media added into 100 µL of extract. Furthermore, each well was added 10 mL of the bacterial suspension was adjusted to 0.5 McFarland standards. Furthermore, the microplate was covered with a plastic wrap and then incubated at 37°C for 18 hours.

Antioxidant activity

The antioxidant activity of the extract was measured based on its scavenging activity of 1-diphenyl 2-picrylhyorazyl (DPPH) free radicals according to the method described previously18 with slight modifications. One milliliter of 0.1 mM DPPH solution in methanol was mixed with 1 ml of plant extract of varying concentrations (100, 120, 140, 160, and 180 μg/mL).

Sample solution

The DPPH solution (2:3) was allowed to stand for the operating time to read absorbance at the maximum wavelength. A mix of 1 ml methanol and 1 ml DPPH solution was used as the control. Corresponding blank samples were prepared and L-ascorbic acid (1–100 µg/ml) was used as a reference standard. The reaction was carried out in triplicate, and the decrease in absorbance was measured at 517 nm after 30 minutes in the dark using a UV-Vis spectrophotometer. Absorbance values were expressed as a percentage of its inhibition (IC50) using the equation:

IC50 value of the sample was obtained by entering a value of 50 into the equation of each sample.

RESULTS AND DISCUSSION

Plant determination

Based on the records available at the Department of Biological Science of Universitas Padjadjaran, the plants used in the research were identified as Morus nigra L.

The drying and Extraction

The purplish black color of black mulberry is due to anthocyanin compounds present in it. These compounds have been found to remain stable in the acidic atmosphere (pH <5) at 50°C, so the drying temperature should not be more than 50°C.20 The maceration process was limited to 2×24 hours to obtain maserat of consistent color from black mulberry.

According to previous study,21 the highest antioxidant compound of morus nigra extracts can be found in a polar solvent. Extraction process using ethanol 96% ca attract secondary compounds from botanicals. Ethanol often used to attract the antioxidant compounds in fruit extracts such as anthocyanin.22,23,24

Phytocemicals screening

The results of phytochemical screening showed can be seen in Table 1. Using phytochemical screening, we detected flavonoids and phenolics in black mulberry.25,26 The presence of anthocyanin was also identified, which gives the extract of black mulberry the characteristic violet color,27 According to previous study,28 the contains of the phytochemical black mulberry extract ethanol compound will be easier to be detected. The antibacterial activity of morus nigra extract can be seen in Table 2.

The Results of MIC and MBC of Morus nigra Ethanol Extract can be seen in Table 3.

Based on our results, the MIC value of black mulberry extract against S. epidermis was in the range of 1.25–2.5%, while the MIC value against P. acnes was in the range of 2.5–5%. The MBC value of black mulberry against S. epidermis was 2.5%, while that against P. acnes was 5%. We can conclude from the above findings that the ethanol extract of black mulberry has excellent antibacterial activity against S. epidermis and P. acnes at a concentration of 2.5%.


Table 1: The Results of Phytochemical Screening of Morus nigra Extract

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+ = presence, − = absence


Table 2: Antibacterial activity

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MIC and MBC of Extracts Black Mulberry Fruit (Morus nigra)


Table 3: The Results of MIC and MBC of Morus nigra Ethanol Extract

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Figure 1: Relationship between concentrations of vitamin C and percentage inhibition of DPPH

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Figure 2: Relationship between concentrations of black mulberry extract and percentage of inhibition of DPPH

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Antioxidant activity

The antioxidant activity test based on DPPH method is one of the most common methods for preliminary testing of plant extracts.29,30 This method is most suitable for polar compounds such as anthocyanins because the DPPH crystals can easily dissolve in a commonly available solvent and give maximum absorbance.

According to previous study,31 the antioxidant activity using ethanol 96% has the value of % inhibition is the highest compared with other solvents. This method can be applied to the antioxidant compound that is hydrophilic and lipophilic.32

Relationship between concentrations of vitamin C and percentage inhibition of DPPH can be seen in Figure 1.

These graphs show that the IC50 of a solution of vitamin C is 3.7057. According previous study33, an antioxidant is considered to be very powerful if its IC50 <50 mg/mL. The hydrogen atom in the hydroxyl group binds to free radicals, thus increasing the stability of free radicals. Vitamin C has four hydroxyl groups and so its antioxidant activity is considered to be very powerful. These hydroxyl groups can give electrons to free radicals.

Relationship between concentrations of black mulberry extract and percentage of inhibition of DPPH can be seen in Figure 2.

In our study, the IC50 of black mulberry extract was 146.731 μg/mL, falling in the range of IC50 values of 100–250 μg/mL for antioxidants.33 Anthocyanins from black mulberry extract in 96% ethanol yielded an IC50 value of 1.2 mg/L. Factors that may cause differences include different varieties of black mulberry used, use of different solvents for extraction, and use of different DPPH. Anthocyanin in black mulberry is the reason for its greatest antioxidant activity.32

The extract of black mulberry has antioxidant activity that is 39.5 times lower than that of a solution of vitamin C. The reason being that an extract of black mulberry contains not only anthocyanin’s but also numerous other secondary metabolites that could not work as hard as vitamin C, which is a pure antioxidant compound.

CONCLUSION

Black mulberry fruit extracts have antibacterial activity with MIC value of by 2.5% against the bacteria S. epidermis and P. acnes. Black mulberry fruit extracts have antibacterial activity with MBC value for each bacterium was 2.5% and 5%. Black mulberry fruit extracts has medium potential antioxidant activity with IC50 value is 146.731 mg / mL.

ACKNOWLEDGEMENT

The Authors thanks to Universitas Padjadjaran for financial support in this research.

CONFLICT OF INTEREST

The authors declare that there is no conflict of interest, financial, or otherwise regarding the publication of this paper.

ABBREVIATIONS USED

MIC: Minimal inhibitory concentration; MBC: Minimum bactericidal concentration; DPPH: 1.1-diphenyl-2-picrylhydrazyl; MHA: Mueller Hinton Agar; MHB: Mueller Hinton Broth; DMSO: Dimethyl sulfoxide.

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GRAPHICAL ABSTRACT


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HIGHLIGHTS OF PAPER

  • Black mulberry fruit extracts have antibacterial activity with MIC value of by 2.5% against the bacteria S. epidermis and P. acnes

  • Black mulberry fruit extracts have antibacterial activity with MBC value for each bacterium was 2.5% and 5%.

  • Black mulberry fruit extracts has medium potential antioxidant activity with IC50 value is 146.731 mg / mL.

AUTHOR PROFILE


Arif Budiman is a lecturer in Universitas Padjadjaran (UNPAD), Indonesia, in Pharmaceutics and Technology Pharmacy department. Has experience in semisolid formulation from medicinal plants.

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Diah Lia Aulifa: Is a lecturer in Sekolah Tinggi Farmasi Indonesia (STFI), Indonesia, in Biology Pharmacy department. Develop work in Phytochemistry and Phytoteraphy from plants.

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Arif Satria Wira Kusuma: Is a lecturer in Universitas Padjadjaran, Indonesia (UNPAD), in Biology Pharmacy department, in the area concentration microbiology and biotechnology.

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Astri Sulastri: Is an undergraduate student of the Pharmacy Course, Universitas Padjadjaran (UNPAD), Indonesia.

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