Research Article
Fatima Mustafa Melad
Fatima Mustafa Melad
Chemistry Department, Education College, El-Mergib University, Khums Libya.
E-Mail: fmelad929@gmail.com, Tell: +218 923117335
Hawa Alsadi
Hawa Alsadi
Chemistry Department, Education College, El-Mergib University, Khums Libya
E-Mail: hawa.alsadi5@gmail.com
Salem Mohamed Edrah
Salem Mohamed Edrah
Corresponding Author
Chemistry Department, Science College Al-Khums, El-Mergib University, Khums Libyaz.
E-Mail: drsalemedrah@gmail.com, Tell: +218 94 415 7827.
Abstract
Medicinal
plants contain various phytochemicals that provide their beneficial properties.
These phytochemicals contribute to the healing and therapeutic effects of the
plants. The aqueous, ethanolic, and methanolic extracts of Silybum marianum
L were thoroughly examined to determine the presence of various metabolites.
The analysis results revealed various components, including triterpenoids,
steroids, tannins, proteins, glycosides, reducing sugars, alkaloids, flavonoids,
carbohydrates, sugars, fats, fixed oils, and saponins. The yields obtained from
leaves, seeds, and flowers were as follows: 58.71, 66.32, 63.34, 47.23, 51.39,
60.22, 42.37, 41.23, and 39.71%, respectively. The results of the quantitative
evaluation demonstrated an impressive presence of tannins, saponins, alkaloids,
and flavonoids, with percentages of 48.21, 53.67, 72.38, and 68.41%,
respectively. In addition, these extractions were carried out in order to
evaluate their effectiveness against harmful bacteria such as Escherichia
coli, Salmonella Typhi, Staphylococcus aureus, and Staphylococcus
epidermis, as well as the fungal strain Candida albicans. The
findings demonstrated significant potential for effectively inhibiting the
proliferation of pathogenic bacteria.
Abstract Keywords
Silybum marianum L, phytoconstituents, bio-constituents, antmicrobial activities, natural products,
traditional drugs.
1.
Introduction
Plants are vital in medicine, especially in developing nations. People have used plants for healing and some traditional medicines are still in use. In Libya, camel thistle (Silybum marianum L) is a medicinal herb. It belongs to the “Asteraceae” family and grows in various regions of Libya and the Mediterranean. Silybum marianum L, commonly referred to as milk thistle, is a biennial herb that belongs to the Asteraceae family. It is indigenous to the Mediterranean and North African regions but is now present globally [1]. The plant has a tall, erect stem with a solitary, sizable, purple flower that terminates in pointed spines. The seeds are black to shiny brown and possess a white, silky pappus [2].
The Silybum
marianum L plant has strong therapeutic effects against diseases,
especially cancer and liver conditions. Studies show its potential in treating
different liver diseases, including liver cancer, by reducing inflammation and
damage. Likewise, Silybum marianum L eliminates toxins produced by
certain mushrooms and enhances the effectiveness of chemotherapy for various
types of cancer, reducing its adverse effects, in addition, Silybum marianum
L used since ancient times to treat diverse ailments, and more recently liver
damage due to toxins, including Amanita phaloides poisoning and others [3-6]. Plants produce vital secondary metabolites
to defend themselves against different pathogens [7].
The active components found in S. marianum seeds include
silybonol, apigenin, betaine, proteins, and free fatty acids [8].
2.
Materials and methods
2.1 Processing
of plant sample
The medicinal plant
Silybum marianum L was carefully harvested
from the pristine wilderness surrounding the city of Alkhums, Libya. The plant
material undergoes a meticulous procedure of washing, drying, and grinding
until it transforms into a delicate powder using the help of an electric mill.
Following this, the powder is meticulously sifted through a 75-micron sieve.
Each part of the plant was meticulously powdered and stored in a
light-resistant, airtight bottle for optimum preservation. These precious
powders were kept in a cool and dry location until they were ready to be used.
2.2 Extraction processes
Silybum marianum L. plant extracts are prepared from leaves, seeds, and flowers using maceration. Fine powders were combined with solvent, left for 72 hours, filtered, and centrifuged. Supernatants were collected, filtered, weighed, and stored for analysis at 4 ºC.
2.3 Yields calculations
Extraction yield (%) = Weight of dried extract (g) / Weight of powdered plant material (g) × 100 (1)
2.4 Phytochemical study
The purpose of this thorough phytochemical study is to analyze and quantify the various components found in different parts of the medicinal plant Silybum marianum L. Specifically, the study will concentrate on examining the leaves, seeds, and flowers of this plant. Furthermore, we will determine the most effective extract for each part by conducting experiments using different solvent mediums.
2.5 Preliminary screening
To obtain a comprehensive understanding of the main categories of secondary metabolites, a preliminary phytochemical screening was performed on the plant extract. This screening of chemical analysis enables us to detect the existence of various compounds in plants, including flavonoids, tannins, alkaloids, phenols, anthraquinones, saponins, steroids, terpenoids, gums, and mucilage, as well as carbohydrates like reducing sugars and polysaccharides [9–19].
2.6 Phytochemical
screening (quantitively)
Consistent with the results of the qualitative analysis of the secondary metabolites products obtained for each of the saponins, alkaloids and flavonoids, these components were quantitively evaluated as the following [16, 19-20].
2.7 Determination of total flavonoids
10g of the plant's parts powders
undergo multiple extractions using 100 mL of 80% aqueous methanol each time,
separately. The resulting mixture is meticulously filtered using Whatman no.1
filter paper into a 250 mL beaker, which has been pre-weighed. Subsequently,
the filtrate is transferred to a water bath and left to completely evaporate.
Finally, the remaining sample is weighed, yielding the final weight.
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑜𝑓 total flavonoid
(%) = 𝑊𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑟𝑒𝑠𝑖𝑑𝑢𝑒 / 𝑊𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑡ℎ𝑒 𝑡𝑎𝑘𝑒𝑛 𝑠𝑎𝑚𝑝𝑙𝑒 × 100 (2)
2.8 Determination of total saponins
A 10-gram of the plant's parts powders was
meticulously combined with 200 ml of 20% ethanol, separately. The mixture was
continuously stirred while being heated over a water bath at a temperature of
55 °C for 4 hours. After this, the resulting mixture underwent filtration. The
residue obtained from the filtration was then re-extracted in the same manner
as before. The extracted substances from both sources were combined and
condensed to a volume of approximately 20 ml using a water bath set at 90 °C.
This concentrated solution was then poured into a 250 ml separator funnel. To
this, 10 ml of diethyl ether was added, and the entire mixture was vigorously
shaken to ensure thorough mixing. The ether layer was discarded, while the
aqueous layer was preserved. Subsequently, the purification process was
repeated, this time with the addition of 25 ml of 1-butanol. The combined
1-butanol extracts were washed twice with 10 ml of a 5% aqueous sodium chloride
solution. The remaining solution was then heated in a water bath, and after
evaporation, the samples were dried and weighed. The content was calculated accordingly.
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑜𝑓 total
saponins (%) = 𝑊𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑟𝑒𝑠𝑖𝑑𝑢𝑒 / 𝑊𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑡ℎ𝑒 𝑡𝑎𝑘𝑒𝑛 𝑠𝑎𝑚𝑝𝑙𝑒 × 100 (3)
2.9 Determination of total alkaloid
10g of the plant's parts powders was
mixed with 200 ml of a mixture of ethanol acetic acid (10%) (Ethanol 180 ml and
20 ml of acetic acid), separately. The mixture was left for 4 hours at room
temperature. The mixture was then filtered using Whatman No. 42 - 125 mm filter
paper. The filtrate was concentrated on a quarter of its initial volume
utilizing a water bath. Then a 5mL of concentrated ammonium hydroxide solution
(NH₄OH) was added to the reduced mixture drop-wise until
precipitation occurred. After filtration and drying in an oven at 40 °C,
the precipitate was collected and weighed. The percentage of the total alkaloid
content was calculated as follows:
𝑃𝑒𝑟𝑐𝑒𝑛𝑡𝑎𝑔𝑒 𝑜𝑓 𝑡h𝑒 𝑡𝑜𝑡𝑎𝑙 𝑎𝑙𝑘𝑎𝑙𝑜𝑖𝑑 (%) = 𝑊𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑟𝑒𝑠𝑖𝑑𝑢𝑒 𝑊𝑒𝑖𝑔ℎ𝑡 𝑜𝑓 𝑡ℎ𝑒 𝑡𝑎𝑘𝑒𝑛 𝑠𝑎𝑚𝑝𝑙𝑒 × 100 (4)
2.10 Determination
of total tannin
8 grams of powdered plant parts were dissolved in 8 ml of distilled water. The mixture was thoroughly combined and vigorously shaken for one hour. Subsequently, it was filtered to remove any impurities. Next, 8 ml of the filtered solution was mixed with 7 ml of 0.1 mM FeCl3 in 0.1 N HCl and 0.008M potassium ferro cyanide in a test tube. Within 10 minutes, the absorbance of the mixture was measured using a spectrophotometer set at 120 nm. To establish a baseline, a blank sample was also prepared, and colour was developed and read at the precise wavelength. A standardized solution was developed using tannic acid to achieve a concentration of 100 ppm, enabling accurate estimation of tannins.
2.11 Antimicrobial assessing
Plants have been used for prevention and treatment since ancient times. Early humans noticed that adding plants to their meals during illness improved their health without side effects. This method has become a standard practice and continues to be acknowledged by the World Health Organization as a critical aspect of primary healthcare that benefits a staggering 80% of the world's population.
2.12 Antimicrobial activities (disk diffusion method)
The plant extracts were tested for
antimicrobial properties using bacterial and fungal strains. Solutions were
made with dry plant extracts dissolved in DMSO and applied to agar plates.
Zones of inhibition were measured after incubation [20-22].
3. Results
and discussion
Table 1 presents the organoleptic
properties of crude extracts from Silybum marianum L. The results
contain important details about pH levels and the percentage yields obtained.
Where each of the pH of aqueous crude extracts of leaves is 6.36, Seeds 6.8 and
Flowers 6.94. The percentage of productivity of leaves, seeds and flowers was
as follows 58.71, 66.32, 63.34, 47.23, 51.39, 60.22, 42.37, 41.23 and 39.71%,
respectively. The color of leaves, seeds, and flowers in the crude extracts
appeared to have distinct organoleptic properties. The aqueous extracts
revealed a rich, deep brown color, while the alcoholic extracts oily dark green
brand. The extract's odors of leaves, seeds, and flower had a pleasant, mildly
fragrant, and highly fragrant aroma. Although the flavors of all extracts had
unique tastes, the consistency was consistently thick and sticky for all
extracts as well. The choice of the extraction method and solvent greatly
influences both the quality and quantity of components derived from the plant,
seeds are
rich in a variety of valuable components, such as crude oil, starches,
mucilage, minerals, tannins, and flavonolignans [23].
Table 1. The organoleptic properties of crude
extracts of Silybum marianum L with pH and percentage yields
Organoleptic Properties |
Types of Silybum marianum L.
Crude
Extracts |
||||||||
Leaves |
Seeds |
Flowers |
|||||||
AQS |
EtOH |
MeOH |
AQS |
EtOH |
MeOH |
AQS |
EtOH |
MeOH |
|
pH |
6.36 |
- |
- |
6.8 |
- |
- |
6.94 |
- |
- |
Yield (%) |
58.71 |
66.32 |
63.34 |
47.23 |
51.39 |
60.22 |
42.37 |
41.23 |
39.71 |
Colour |
Dark Brown |
Oily Dark Green |
Oily Dark Green |
Dark Brown |
Oily Dark Green |
Oily Dark Green |
Dark Brown |
Oily Dark Green |
Oily Dark Green |
Odour |
Aromatically |
Moderately aromatic |
Intensely aromatic |
||||||
Taste |
Distinctive flavor |
Distinctive flavor |
Distinctive flavor |
||||||
Shape |
Thick and sticky textur |
Thick and sticky texture. |
Thick and sticky texture. |
||||||
AQS = Aqueous Extract, EtOH = Ethanol
Extract, and MeOH = Methanol Extract. |
3.1
Phytochemical constituents
3.1.1
Qualitative phytochemical
Table 2 shows the results of the phytochemical screening of the metabolites contained in the crude aqueous, ethanolic and methanolic extracts of Silybum marianum L, which are triterpenoids, steroids, tannins, protein, glycosides, reducing sugars, alkaloids, flavonoids, carbohydrates sugars, fats, fixed oils, saponins, where it was found that all the detected components were between medium and rich in presence in both extracts. The presence of vital and active constituents in the plant’s leaves, seeds and flowers especially secondary metabolites makes it play a very significant role in the prevention, resistance and elimination of many pathogenic microbes that are harmful to human health. From the facts provided previously, it is evident that the presence of both primary and secondary metabolite ingredients plays a vital role in ensuring the overall health and vitality of leaves. The seeds and flowers of Silybum marianum L have numerous health benefits and can be used as both preventative measures and treatment for various diseases.
Table 2. Results of phytochemical screening of aqueous and ethanolic Silybum marianum L. crude extracts
Phytochemicals |
Plant parts and type of extracts |
|||||||||
Leaves |
Seeds |
Flowers |
||||||||
AQS |
EtOH |
MeOH |
AQS |
EtOH |
MeOH |
AQS |
EtOH |
MeOH |
||
Flavonoids |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
|
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
||
Tannins |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
|
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
||
Alkaloids |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
+++ |
|
Phenols |
++ |
++ |
++ |
++ |
++ |
++ |
++ |
++ |
++ |
|
Anthraquinones |
- |
- |
- |
- |
- |
- |
- |
- |
- |
|
Saponins |
+++ |
+++ |
++ |
+++ |
+++ |
++ |
+++ |
+++ |
++ |
|
Steroids |
+ |
++ |
+ |
++ |
+ |
++ |
+ |
++ |
+ |
|
Terpenoids |
+++ |
+++ |
++ |
++ |
++ |
++ |
++ |
++ |
++ |
|
Gums and Mucilage |
+ |
+ |
+ |
+ |
+ |
+ |
+ |
+ |
+ |
|
Carbohydrates |
Reducing Sugars |
++ |
++ |
++ |
++ |
++ |
++ |
+ |
+ |
+ |
Polysaccharides |
++ |
++ |
++ |
++ |
++ |
++ |
+ |
+ |
+ |
3.1.2 Quantitative
phytochemical
Table 3 presents the quantitative evaluation results of Silybum marianum L. The percentage yields of tannins, saponins, alkaloids, and flavonoids were determined for leaves, seeds, and flowers. The leaf extract exhibited impressive percentages, with tannins, saponins, alkaloids, and flavonoids at 48.21, 53.67, 72.38, and 68.41%, respectively. Meanwhile, the seed extract demonstrated significant results, with percentages of 12.61, 44.83, 22.78, and 46.78%, respectively. Remarkably, the flower extract exhibited important levels of tannins (10.39%), saponins (50.12%), alkaloids (29.62%), and flavonoids (67.15%).
Table 3. Results of the quantitative evaluation of the Silybum marianum L
Plant
Name and Associated Parts |
Yields (%) |
||||
Tannins |
Saponins |
Alkaloids |
Flavonoids |
||
Silybum marianum L |
Leaves |
48. 21 |
53.67 |
72.38 |
68.41 |
Seeds |
12. 61 |
44.83 |
22.78 |
46.78 |
|
Flowers |
10.39 |
50.12 |
29.62 |
67.15 |
Tannins, saponins, alkaloids, and flavonoids are crucial elements in fighting diseases and eliminating harmful microbes [24-26]. Perhaps because these compounds have great antioxidant properties, they also show enhanced efficacy due to the presence of functional groups. Traditional herbs are popular due to their affordability and availability. Concerns about synthetic medications have increased. The method of extraction and the selection of solvent greatly affect both the quantity and quality of plant components [27-29]. Secondary metabolites are essential for regulating vital pathways. To regulate important pathways in a highly effective manner. Plants have valuable secondary metabolites with pharmacological properties. They serve as defense mechanisms and have specialized functions [30-32]. Compounds like flavonoids, saponins, terpenoids, and alkaloids have anti-diabetic properties. The compounds mentioned possess remarkable characteristics and hold great promise as medicinal agents for treating diabetes [33-36].
3.2 Antibacterial activity
Table 4
presents the results of the Antibacterial evaluation on the crude extracts of
various plant parts, including leaves, seeds, and flowers of the medicinal
plant Silybum marianum L evaluated the effectiveness
of these extracts against both pathogenic bacteria and Candida albicans.
Table 4. Results of the biological activity assessment of extracts of leaves, seeds and flowers of Silybum marianum L against different types of bacterial and fungal
Microbials |
Types of Crude Extracts and the zones of inhibition (mm) |
||||||||||
Leaves |
Seeds |
Flowers |
Antibiotics |
||||||||
AQS |
EtOH |
MeOH |
AQS |
EtOH |
MeOH |
AQS |
EtOH |
MeOH |
Gent |
Cont. |
|
Escherichia
coli(-) |
14 |
15 |
18 |
13 |
15 |
18 |
13 |
17 |
19 |
25 |
- |
Salmonella spp.(-) |
16 |
17 |
19 |
17 |
16 |
17 |
15 |
18 |
16 |
24 |
- |
Staphylococcus
aureus(+) |
19 |
14 |
13 |
18 |
14 |
16 |
17 |
14 |
14 |
24 |
- |
Staphylococcus epidermis(+) |
18 |
17 |
15 |
11 |
19 |
17 |
13 |
16 |
13 |
22 |
- |
Candida
albicansy |
10 |
15 |
16 |
17 |
12 |
14 |
14 |
16 |
13 |
- |
20 |
AQS = Aqueous Extract, EtOH = Ethanol
Extract, and MeOH = Methanol Extract. Gentamycin = Gent; Contamazole = Cont. (+) = Gram-positive bacteria include Staphylococcus
aureus and Staphylococcus epidermidis;
(+) = Gram-negative bacteria include
Escherichia coli and Salmonella spp.; y
= Candida albicans is an opportunistic pathogenic yeast in the fungus kingdom.
The aqueous extracts exhibited significant antibacterial activities. Escherichia Coli displayed impressive values of 14, 13, and 13 mm. When tested against Salmonella SPP., their activity increased even further with values of 16, 17, and 15 mm. For Staphylococcus aureus, the activities were 19, 18, and 17 mm, and for Staphylococcus epidermidis, they were 18, 11, and 13 mm. Candida albicans showed activities of 10, 17, and 14 mm with the aqueous extracts. Ethanolic extracts also demonstrated distinguished antibacterial properties. Against Escherichia Coli, the activities were 15, 15, and 17 mm, and against Salmonella SPP., they were 17, 16, and 18 mm. The activities against Staphylococcus aureus were 14 mm, while for Staphylococcus epidermidis they were 17, 19, and 16 mm. Candida albicans showed activities of 15, 12, and 16 mm with the ethanolic extracts. Methanol-based extracts from the leaves, seeds, and flowers of Silybum marianum L not only exhibited noteworthy antibacterial properties but also demonstrated impressive performance. Against Escherichia Coli, the measured activities were 18, 18, and 19 mm, respectively. The measures taken to combat Salmonella bacteria. Were measured at 19, 17, and 16 mm. For Staphylococcus aureus, the observed activities were 13, 16, and 14 mm, and for Staphylococcus epidermidis, they were 15, 17, and 13 mm. Lastly, Candida albicans displayed activities of 16, 14, and 13 mm with the methanol-based extracts. It is worth noting that antibiotics showed the highest level of effectiveness against bacteria. Gentamicin and Contamazole, used as positive controls, exhibited superior activity, likely due to their pure form.
In
Libya, the use of therapeutic plants, particularly in traditional medicine, is
widely encouraged. This is a response to the growing concern surrounding the
resistance of synthetic antimicrobial agents. Secondary metabolites, such as
saponins, tannins, alkaloids, coumarins, glycosides, essential oils, and
flavonoids, are a wide range of biologically active substances. The extracts
derived from this plant have shown considerable potential in reducing the risk
of bacterial infections [34]. Moreover, Silybum
marianum L has
also demonstrated antiparasitic activity against cutaneous leishmaniasis [35-36].
4.
Conclusions
The therapeutic properties of Silybum
marianum L, a medicinal plant, have been discovered in its
leaves, seeds, and flowers, revealing its exceptional healing potential. The
plant's abundance of secondary metabolites, including alkaloids, phenols, and
flavonoids, contribute to these remarkable properties. Additionally, the
research has revealed a treasure trove of tannins, saponins, alkaloids, and
flavonoids within the plant. Not only do these powerful compounds help in
combating infections, but they also play a vital role in the prevention and
treatment of numerous diseases. Furthermore, the plant's impressive ability to
combat both bacteria and fungi highlights its immense potential. This study has
not only revealed the plant's potent biological components, but also its
remarkable impact on microbial activity. The comparison between the plant
extracts and antibiotics demonstrates the plant's potential. Especially given
the exceptional results obtained in this research, which showcased the significant
efficacy of plant extracts when compared to the presence of antibiotics.
Harnessing the power of these beneficial compounds can yield countless
advantages, including disease prevention, particularly in terms of cancer, and
potentially even completely replacing chemically synthesized antibiotics in the
coming years.
Authors’ contributions
Conducted
valuable scientific research and collected scientific literature, S.E. and
F.M.; Collaborated to materialize and type the review, S.E., F.M. and H.A.
Acknowledgements
We deeply
appreciate the Chemistry Departments of the Faculty of Science and Faculty of
Education at the University of Elmergib Alkhums in Libya for their incredible
support and assistance. The success of our research article owes a great deal
to their generous support and the provision of a fully-equipped laboratory.
Funding
We inform you that our
research project has not secured any funding.
Availability of data and materials
The paper includes all the necessary
data, along with its corresponding supporting information files. As per the
Journal's request, we will provide the required supplementary data.
Conflicts of interest
There are no potential
conflicts of interest to disclose in relation to the research, authorship,
and/or publication of this article.
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This work is licensed under the
Creative Commons Attribution
4.0
License (CC BY-NC 4.0).
Abstract
Medicinal
plants contain various phytochemicals that provide their beneficial properties.
These phytochemicals contribute to the healing and therapeutic effects of the
plants. The aqueous, ethanolic, and methanolic extracts of Silybum marianum
L were thoroughly examined to determine the presence of various metabolites.
The analysis results revealed various components, including triterpenoids,
steroids, tannins, proteins, glycosides, reducing sugars, alkaloids, flavonoids,
carbohydrates, sugars, fats, fixed oils, and saponins. The yields obtained from
leaves, seeds, and flowers were as follows: 58.71, 66.32, 63.34, 47.23, 51.39,
60.22, 42.37, 41.23, and 39.71%, respectively. The results of the quantitative
evaluation demonstrated an impressive presence of tannins, saponins, alkaloids,
and flavonoids, with percentages of 48.21, 53.67, 72.38, and 68.41%,
respectively. In addition, these extractions were carried out in order to
evaluate their effectiveness against harmful bacteria such as Escherichia
coli, Salmonella Typhi, Staphylococcus aureus, and Staphylococcus
epidermis, as well as the fungal strain Candida albicans. The
findings demonstrated significant potential for effectively inhibiting the
proliferation of pathogenic bacteria.
Abstract Keywords
Silybum marianum L, phytoconstituents, bio-constituents, antmicrobial activities, natural products,
traditional drugs.
This work is licensed under the
Creative Commons Attribution
4.0
License (CC BY-NC 4.0).
Editor-in-Chief
Prof. Dr. Christian Celia
This work is licensed under the
Creative Commons Attribution 4.0
License.(CC BY-NC 4.0).