India is a country that is famous for its spices. Since ancient times, people have used spices in their kitchens to enhance the flavor of their food and for therapeutic purposes
[1]. Many people use spices to treat microbial infections including bacterial fungal and viral ones. Some spices such as turmeric, garlic, asafoetida, clove, ginger, and many more are routinely used in India to cure diseases
[2,3][2][3]. More than 500 thousand plants exist on Earth, but only 10% of plants are known to be used by humans and animals
[1,4][1][4]. In the last few decades, the number of multidrug-resistant microbes has increased gradually
[4]. Humans use too many antibiotics and antifungals, creating endurance in microbes, and thus, they are becoming resistant to them. Various microbial infections such as bacterial and fungal infections cause life-threatening diseases as a result of microbes such as
Escherichia coli,
Klebsiella pneumoniae,
Pseudomonas aeruginosa,
Neisseria gonorrhea,
Candida albicans, and
Candida auris, etc.
[5], which are multidrug resistant and cause several diseases such as cholera, respiratory syndrome, bacterial meningitis, urinary tract infections, Candidiasis, and Aspergillosis
[6]. The harrowing conditions caused by infectious diseases as a result of drug-resistant microbes and antibiotic side effects has directed
our interest toward herbal and spice plants that are used as natural drugs and have fewer side effects than synthetic drugs do
[7,8][7][8]. In recent years, many researchers have shown interest in spices for treating some infectious diseases to check the antimicrobial activity of spices against a wide range of bacteria, yeasts, and fungus
[9,10][9][10]. Many spices such as coriander, cinnamon, gooseberry, turmeric, clove, fenugreek seed, asafoetida, star anise, garlic, black pepper, bay leaf, and curry leaf, etc., show good antimicrobial activity
[11,12][11][12].
Curcuma longa, which is commonly called turmeric, is used in food, gives an orange-yellow color, and is very efficient against some fungus and bacterial strains. Its most active compound is curcumin, which has many benefits that have been scientifically proven by researchers
[13,14][13][14].
In tThe
literature review, the reresearchers advise that curcumin may be helpful for preventing metabolic syndrome and inflammatory conditions, and it also helps to improve heart disorders
[15,16][15][16]. Indian gooseberry’s scientific name is
Emblica officinalis, but it is commonly called “Amla” in India
[17]. It adds a sour flavor to food. It is used to cure several skin disorders, and also, to recover immunity
[18]. Its ethanol and methanol extracts show good activity against both bacterial and fungal strains
[1].
Foeniculum vulgare essential oils work very well against many bacterial and fungal strains in India, and they are commonly called “Saunf” or fennel seeds
[19]. Fennel seed has a sweet smell, and is highly nutritious. Chewing fennel seed help with digestion, and it may prevent many abdominal-related diseases
[20]. “Hing” is a spice that has a strong odor, and its scientific name is
Ferula assafoetida [21]. It has been used to cure coughs, asthma, stomach pain, blood pressure, and menstrual cramps, etc. Spices and their ingredients are generally recognized as safe (GRAS)
[22], and their use is permitted by various regulatory agencies such as the (FDA), the European Union standards, and the Food safety and standard authority of India (FSSAI)
[23]. Overall, spice extracts and their essential oils have the potential to prevent microbial infections
[24]. Therefore, the extract of the spices is used as a natural drug to inhibit bacterial and fungal infections
[25]. The main active compound of essential oil is terpenes, and they are phenolic and have antimicrobial properties
[10]. All active phenolic compounds have a different target to eliminate harmful pathogens. A rapidly increasing number of cases of multidrug-resistant pathogens are causing a big problem in society.
2. Antimicrobial Property of Spices
Several research articles suggest that spices such as curcumin, clove, oregano, thyme, star anise, cumin, black pepper, garlic, coriander, and many more spices have antimicrobial properties, and they are used to treat antibacterial and antifungal infections
[6,7,27][6][7][26]. The activity of spices depends on their extraction method and which solvent was used for their extract
[25,26,36][25][27][28]. Numerous spices produce essential oils, which are more effective against different types of bacterial and fungal strains
[33,34][29][30]. Essential oils, which are also called volatile oils when they are extracted from plants containing hydrophobic liquid volatile compounds, are widely used in aromatherapy and several therapeutic systems
[25]. As a result, those in the scientific sector are looking at them even more for the treatment of various illnesses, such as cancer, HIV, and asthma
[23].
2.1. Cloves
In order to enhance the flavor and scent of our food,
Syzygium aromaticum, a member of the Myrtaceae family, is frequently used as a spice
[36][28]. Eugenol is a phytochemical that is extracted from cloves and used to alleviate toothache pain and other types of pain. Several research projects on cloves are checking their efficacy against many pathogens
[6]. Both clove essential oil (EO) and eugenol are phenolic molecules that can deactivate peptides, alter the composition of cellular membranes, and prevent the growth of some varieties of yeast and Gram-positive and Gram-negative bacteria
[37][31]. Due to their medicinal properties, they are used as antiseptics in dentistry to overcome dental pain
[38][32].
2.1.1. Phytochemical of Cloves
Many investigations have been conducted to identify different
S. aromaticum components
[39][33]. Between fifteen and twenty percent of the essential oils found in clove buds are made up of eugenol, eugenyl acetate, and β-caryophyllene
[38][32]. Clove oil also contains triterpenoids, including alpha-linolenic acid, vanillin, categoric acid, tannins, gallotannic acid, methyl salicylate, eugenin, kaempferol, rhamnetin, and eugenitin
[6]. The distinctively pleasant aroma of cloves is caused by minor ingredients such as methyl amyl ketone, and methyl salicylate, etc.
[40][34]. Some phytochemical properties of clove show in
Figure 1.
Figure 1. Phytochemical and therapeutic properties of cloves.
2.1.2. Antimicrobial Activity of Cloves
Numerous studies have shown that cloves have strong antibacterial properties. Many compounds, including eugenol, iso-eugenol, methyl-eugenol, phenyl propanoides, dehydro-dieugenol, and trans-confireryl aldehyde, are present
[42][35]. These substances have the ability to denature proteins and interact with lipids in the cellular membrane to influence their porosity. Due to the lysis of the spores and micelles, eugenol was discovered during a chromatographic analysis to be the primary component responsible for antifungal activities. Devi et al.
[43][36] similarly observed a similar mode of action for membrane ruptures and macromolecule deformations caused by eugenol. For
Candida,
Aspergillus, and
dermatophytes, a wide range of fungicidal activities were documented, and their mechanisms of action were related to perforations of the cell membranes
[44][37].
2.2. Cinnamon
The botanical name for cinnamon is
Cinnamomum verum, and it is an evergreen plant, and the spices are obtained from its bark
[45][38]. The spice is brown in color, and it has a pleasant fragrance and a sweet flavor. Its essential oil is used in drugs, perfume, flavoring, and liqueur. The major phytochemical compound present in their essential oil is cinnamaldehyde, which is responsible for their antimicrobial property
[46][39]. Cinnamon extract has various therapeutic uses; it shows antifungal, antibacterial, anti-diarrheal, antisemitic, and insecticidal properties
[47][40]. Cinnamon is also used in aromatherapy, which is the medicinal application of plant essential oils that enter the body through the skin or the nose
[9]. There are several types of research on cinnamon spices regarding their different roles in the medicinal field
[7].
2.2.1. Phytochemicals of Cinnamon
Cinnamon is made up of many resinous substances, such as cinnamaldehyde, cinnamate, and cinnamic acid, and a large number of essential oils
[48][41]. According to Singh et al.
[49][42], the spicy flavor and scent are caused by the presence of cinnamaldehyde, and they occur as a result of oxygen absorption. In
Figure 2 wresearche
rs represent the structure of cinnmaldehyde. The hue of cinnamon darkens with age, enhancing the resinous components. Sangal reported that cinnamon has a number of physiochemical qualities
[49][42].“Trans-cinnamaldehyde, cinnamyl acetate, eugenol, L-borneol, caryophyllene oxide, b-caryophyllene, L-bornyl acetate, E-nerolidol, α-cubebin, α-terpineol, α-terpinolene, and α-thujene are just a few of the essential oils that have been found”
[50][43].
Figure 2. Active compound of cinnamon (Cinnamaldehyde).
2.2.2. Antimicrobial Activity of Cinnamon
Numerous antibacterial properties of cinnamon and its oils have been documented to date in numerous research studies
[48][41]. For example, Matan et al. stated the effects of cinnamon oils on various bacterial, fungal, and yeast species, which indicate cinnamon as a natural antimicrobial agent
[51][44]. According to Goi et al., combinations of cinnamon and clove oils have antibacterial properties both against Gram-positive and Gram-negative bacteria, including
Listeria monocytogenes,
Enterococcus faecalis,
Staphylococcus aureus, and
Bacillus cereus [52][45]. According to a study by Hili et al., cinnamon oils may be effective against yeast and a variety of bacteria, including
Pseudomonas aeruginosa,
Staphylococcus aureus, and
Escherichia coli [53][46]. A recent study described the effectiveness of cinnamon and other plant extracts against oral bacteria. Overall, compared to other examined plant extracts such as
Azadirachta indica and
Syzygium aromaticum, cinnamon’s essential oil is more potent
[54][47].
2.3. Cardamom
Green cardamom’s botanical name is
Elettaria cardamomum, and it fits into the Zingiberaceae family
[55][48]. It is used as a flavoring additive in food preparation, drinks, and medication
[56][49]. Cardamom shows good antibacterial and antifungal activities Many research studies suggest that cardamom helps to boost the immune system, reduce high blood pressure, reduce long-term inflammation, cure digestive problems, and also, improve breathing
[57][50]. Researchers on this spice are developing new antibiotics that are less harmful to health.
2.3.1. Phytochemicals of Cardamom
Depending on the species, plant sections, and extraction techniques used, the yield of the EO from dry cardamom ranged from 0.2% to 8.7%
[58][51]. It contains 1,8-cineole, α-terpinyl acetate, α-terpineol, sabinene, nerol and α-pinene α-terpinyl acetate
[55][48], α-terpineol 1, 8-cineole, sabinene, linalyl acetate, linalool limonene
[59][52], 4-terpineol
[60][53], geranylacetate, cis-sabinene hydrate acetate, β-caryophyllene, β-selinene, γ-cadinene, translinalooloxide
[61][54], Geraniol, 1,8-Cineole, β-terpineol, 4-terpineol, and 1,8-Cineol, α-terpene
[62][55]. Main active compound is cineole and α- terpinol shown in
Figure 3.
Figure 3. Active compound of cardamom (Cineole and α-terpineol).
2.3.2. Antimicrobial Activity of Cardamom
Cardamom essential oil (CEO) has potent antibacterial properties against a range of food-borne pathogens. Cardamom oil application moderately inhibited the growth of
Morgenella morganii [55][48]. CEO (10 mg/mL) showed antibacterial activity against
S. aureus,
E. coli, and
C. albicans [63][56]. Therefore, CEO could be extremely important in creating new and safe antibiotics for use in modern medicine
[64][57]. CEOs may be used to prevent damage from food-borne illnesses and microbial agents that cause food to rot because of their potential for diverse antibacterial and antifungal activities
[65,66][58][59]. The disc diffusion approach has been used in the bulk of investigations looking at the antibacterial activity of cardamom extracts and CEO, however, because of its flaws, it must be combined with the more useful MIC test
[67][60].
2.4. Coriander
Coriandrum sativum is widely used in spices all parts of this plant that have a significant role in their properties
[68][61]. They contain several compounds such as thymol, bornyl acetate, gallic acid, and many more. The essential oil of coriander contains polyphenol and terpenes, the major constituent of coriander is linalool, which has several medicinal properties and strong flavors its structure given in
Figure 4 [69][62]. Its seeds are consumed for relieving pain, inflammation, and rheumatoid arthritis, whereas its extraction is used for eye problems and mouth ulcers. Coriander shows very good activity against food-borne pathogens such as
Campylobacter and
Salmonella, and in addition, it is also used as an antioxidant, for indigestion, and diabetes
[70][63].
Figure 4. Active compound of coriander (Linalool).
2.4.1. Phytochemical of Coriander
A medicinal plant called
Coriandrum sativum L. is indigenous to the eastern Mediterranean region, from which it has spread to various parts of the world, along with many other aromatic species
[72][64]. In this context, the primary and secondary metabolite of coriander is the essential oil. However, the current compilation also makes reference of an additional group of active ingredients.
Fruits contain carbohydrates, alkaloid, quercetin, resins, tannins, quinones, sterols, and fixed oils
[73][65]. The parts of the coriander fruits that are thought to be most important are the essential oil and fatty oil. The fatty acids present in coriander fruits include palmitic acid, cis-6-octadecenoic acid, linoleic acid, and oleic acid
[74][66]. As per the reports, coriander is a very good source of thiamine, zinc, and dietary fiber, and like all other green leafy vegetables, it has very low amounts of saturated fat and cholesterol, as well as a rich supply of vitamins, minerals, and iron
[75][67]. Eighty-four percent of unripe coriander is water. Here, the order of the most significant phytoconstituents are described
[12].
2.4.2. Antimicrobial Activity of Coriander
The essential oil concentration of coriander is what gives it its antibacterial properties
[76][68]. Additionally, it was discovered that coriander’s aqueous extract was effective against bacteria that cause acne (the MIC values for Propionibacterium acne and
Staphylococcus epidermidis are within 1.7–2.1 mg/mL, respectively)
[77][69]. The widely viable formulations for the treatment of acne displayed similar activities. Due to its antibacterial properties, coriander oil is a fantastic choice for the development of cutting-edge anti-acne compositions
[78][70]. The antioxidant, anti-inflammatory, analgesic, and antibacterial qualities of coriander make it a valuable herbal therapy for diaper dermatitis, a common skin condition. Additionally, coriander oil has demonstrated potent activity with varying degrees of inhibition against
Bacillus cereus,
Enterococcus faecalis,
Staphylococcus aureus,
Pseudomonas aeruginosa, and
Acinetobacter baumannii [79][71]. With the exception of
Bacillus cereus and
E. faecalis,
P. aeruginosa was the most resistant strain to growth inhibition by the tested oil, displaying the highest determined MIC, along with one of the multidrug-resistant clinical isolates of
Acinetobacter baumannii [79][71]. As a result, the use of coriander oil in antibacterial formulations can be encouraged because it efficiently eliminates the harmful bacteria linked to hospital infections and foodborne illnesses
[80][72]. The antibacterial and antifungal properties of coriander essential oils have been examined in numerous research, and they have been determined to have good potency. The essential oil from
Coriandrum sativum produced by hydrodistillation was tested against various fungi, and it showed antifungal action against
Candida, with the exception of
C. tropicalis CBS
94 [81][73]. As a result, it was determined that the oil had potential as an antibacterial agent for treating or preventing
Candida yeast infections. The fruit oil of coriander was found to exhibit excellent efficacy against
Listeria monocytogenes,
S. aureus,
S. haemolyticus,
P. aeruginosa, and
E. coli [82][74]. Additionally, coriander essential oils extracted using both hydro distillation and microwave assistance have been tested for their antibacterial potency. Other than the time and energy savings, no noticeable differences in the activities were discovered
[83][75].