What is marjoram

Marjoram (Origanum majorana L.) commonly known as sweet marjoram from the family Lamiaceae, is a perennial herb that is native to Mediterranean region and cultivated in many countries of Asia, North Africa, and Europe, for example, Spain, Hungary, Portugal, Germany, Egypt, Poland, and France ¹. Marjoram (Origanum majorana L.) grows up to 30 to 60 cm. Marjoram is a perennial bushy plant. It has oblique rhizome, hairy shrub like stalks, opposite dark green oval leaves and white or red flowers in clustered bracts. The leaves are whole, larger ones being fragmented, oblate to broadly elliptical ². In some Middle Eastern countries, marjoram is synonymous with oregano, and there the names sweet marjoram and knotted marjoram are used to distinguish it from other plants of the genus Origanum. Marjoram plant is widely used as a garnish and is used for different medicinal purposes in traditional and folklore medicine of different countries. Sweet marjoram has been used for variety of diseases in traditional and folklore medicines, including ocular disorder, nasopharyngeal disorders, asthma, cold, coughs, cramps, depression, dizziness, gastrointestinal disorders, hay fever, headache, toothache, and sinus congestion and as a diuretic and to promote menstruation ³ and for cardiac, rheumatologic, and neurological disorders ¹.

Various compounds have been identified in sweet marjoram. Also, different pharmacological activities have been attributed to this plant. Essential oil containing monoterpene hydrocarbons and oxygenated monoterpenes as well as phenolic compounds are chemical constituents isolated and detected in marjoram. Wide range of pharmacological activities including antioxidant, hepatoprotective, cardioprotective, anti-platelet, gastroprotective, antibacterial and antifungal, antiprotozoal, antiatherosclerosis, anti-inflammatory, antimetastatic, antitumor, antiulcer, and anticholinesterase inhibitory activities have been reported from this plant in modern medicine ¹.

Figure 1. Marjoram (sweet marjoram)

Figure 2. Dried marjoram (marjoram herb)

Marjoram uses

Traditional medicine uses

Ethnomedicinal uses of sweet marjoram in different countries are shown in Table 1. The parts of sweet marjoram that are used in folklore medicine are dried leaves, leaves extract, and essential oil. Marjoram leaves have been claimed to have antimicrobial and emmenagogue (a substance that stimulates or increases menstrual blood flow) properties and be useful for treatment of respiratory and gastrointestinal problems ². Marjoram has been used in Morocco as an antihypertensive plant ⁴. The marjoram essential oil has been used for pains, gastrointestinal problems, and respiratory tract disorders ⁴.

Table 1. Traditional medicine uses of marjoram

Region	Plant Part Used	Traditional Uses
Iran 5	Leaves	Antimicrobial, antiseptic, antidote, carminative, antitussive and used for gastrointestinal disorder, head cool, sniffle, vision performance, otitis, melancholia accompanied by flatulence, unilateral facial paralysis, headache, epilepsy, cataract, weakness of sight, ear pain, dyspnea, cardiac pain, dysrhythmia, cramp, obstruction of large intestine, emmenagogue, strangury, dropsy, spondilolysthesis, groin pain, back pain, fatigue, freckle, migraine
Azerbaijan 6	Essential oil	Flatulence, nervousness, diuretic, sedative
England 2	Leaves	Cold, bronchial coughs, asthmatic whooping
Egypt 2	Leaves	Cold, chill
India 7	Essential oil	Toothache, soothe joints, muscular pain
Austria 8	Leaves	Gastrointestinal tract diseases, infections
Turkey 9	Essential oil	Asthma, indigestion, headache, rheumatism
Morocco 10	Leaves	Hypertension

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Phytochemical constituents of marjoram

Table 2. Structure and phytochemical category of compounds isolated from different parts of sweet marjoram.

Compound	Chemical Category	Part/Extract
α-Pinene	Monoterpene hydrocarbon	Essential oil11
β-Pinene	Monoterpene hydrocarbon	Essential oil11
ρ-Cymene	Monoterpene hydrocarbon	Essential oil12
Camphene	Monoterpene hydrocarbon	Essential oil11
α-Phellandrene	Monoterpene hydrocarbon	Essential oil 12
β-Phellandrene	Monoterpene hydrocarbon	Essential oil 12
γ-Terpinene	Monoterpene hydrocarbon	Essential oil13
d-Limonene	Monoterpene hydrocarbon	Essential oil 14
α-Terpinene	Monoterpene hydrocarbon	Essential oil 13
Terpinolene	Monoterpene hydrocarbon	Essential oil 12
β-Myrcene	Monoterpene hydrocarbon	Essential oil 12
2-Carene	Monoterpene hydrocarbon	Essential oil 15
β-Ocimene	Monoterpene hydrocarbon	Essential oil 15
Sabinene	Monoterpene hydrocarbon	Essential oil 2
α-Thujene	Monoterpene hydrocarbon	Essential oil 12
Carvone	Monoterpene hydrocarbon	Essential oil 12
Citronellol	Monoterpene hydrocarbon	Essential oil 14
Terpinen-4-ol	Oxygenated monoterpene	Essential oil 13 / Leaf 16
cis-Sabinene hydrate	Oxygenated monoterpene	Essential oil 13
trans-Sabinene hydrate	Oxygenated monoterpene	Essential oil 13
Linalool	Oxygenated monoterpene	Leaf 16 / Essential oil 14
Thymol	Oxygenated monoterpene	Essential oil 17
α-Terpineol	Oxygenated monoterpene	Essential oil 13
Linalyl acetate	Oxygenated monoterpene	Essential oil 12
Carvacrol	Oxygenated monoterpene	Essential oil 14
1,8-Cineol	Oxygenated monoterpene	Essential oil 15
Fenchyl alcohol	Oxygenated monoterpene	Essential oil 15
Piperitol	Oxygenated monoterpene	Essential oil 15
trans-Carveol	Oxygenated monoterpene	Essential oil 15
cis-Carveol	Oxygenated monoterpene	Essential oil 15
Anethole	Oxygenated monoterpene	Essential oil 15
Geraniol	Oxygenated monoterpene	Essential oil 14
α-Terpinyl acetate	Oxygenated monoterpene	Essential oil 12
Geranyl acetate	Oxygenated monoterpene	Essential oil 15
α-Cubebene	Sesquiterpene hydrocarbon	Essential oil 15
Longicyclene	Sesquiterpene hydrocarbon	Essential oil 15
Copaene	Sesquiterpene hydrocarbon	Essential oil 15
β-Longipinene	Sesquiterpene hydrocarbon	Essential oil 15
β-Caryophyllene	Sesquiterpene hydrocarbon	Essential oil 15
Aromadendrene	Sesquiterpene hydrocarbon	Essential oil 15
α-Humulene	Sesquiterpene hydrocarbon	Essential oil 15
β-Farnesene	Sesquiterpene hydrocarbon	Essential oil 15
Alloaromadendrene	Sesquiterpene hydrocarbon	Essential oil 15
α-Selinene	Sesquiterpene hydrocarbon	Essential oil 15
ar-Curcumene	Sesquiterpene hydrocarbon	Essential oil 15
Germacrene D	Sesquiterpene hydrocarbon	Essential oil 15
Valencene	Sesquiterpene hydrocarbon	Essential oil 15
α-Muurolene	Sesquiterpene hydrocarbon	Essential oil 15
α-Farnesene	Sesquiterpene hydrocarbon	Essential oil 15
Spathulenol	Sesquiterpene alcohol	Essential oil 12
Caryophyllene oxide	Oxygenated sesquiterpene	Essential oil12
Carnosic acid	Diterpenoid	Water extract 18
Carnosol	Diterpenoid	Water extract 18
Ursolic acid	Triterpenoid	Water extract 18
Sinapic acid	Phenolic acid	Essential oil 2
Vanillic acid	Phenolic acid	Hydroalcoholic extract 19 / Essential oil 2
Ferulic acid	Phenolic acid	Hydroalcoholic extract 19 / Essential oil 2
Caffeic acid	Phenolic acid	Hydroalcoholic extract 19 / Essential oil 2
Syringic acid	Phenolic acid	Hydroalcoholic extract 19 / Essential oil 2
ρ-Hydroxybenzoic acid	Phenolic acid	Hydroalcoholic extract 19 / Essential oil 2
m-Hydroxybenzoic acid	Phenolic acid	Hydroalcoholic extract 19
Coumarinic acid	Phenolic acid	Essential oil 2
Gallic acid	Phenolic acid	Hydroalcoholic extract 19
Neochlorogenic acid	Phenolic acid	Hydroalcoholic extract 19
Protocatechuic acid	Phenolic acid	Hydroalcoholic extract 19
Caftaric acid	Phenolic acid	Hydroalcoholic extract 19
Rosmarinic acid	Phenolic acid	Ethyl acetate extract 9 / Essential oil 20
Chlorogenic acid	Phenolic acid	Hydroalcoholic extract 19
Cryptochlorogenic acid	Phenolic acid	Hydroalcoholic extract 19
Coumaric acid	Phenolic acid	Hydroalcoholic extract 19
Lithospermic acid	Phenolic acid	Water extract 21
Methyl rosmarinate	Phenolic compound	Hydrophilic extract 22
Hydroquinone	Phenolic compound	Ethyl acetate extract 9 / Essential oil 17
Arbutin	Phenolic glycosides	Ethyl acetate extract 9 / Essential oil 17
Methyl arbutin	Phenolic glycoside	Essential oil 17
Vitexin	Phenolic glycoside	Essential oil 17
Orientinthymonin	Phenolic glycoside	Essential oil 17
Hesperetin	Flavonoid	Ethyl acetate extract 9
Catechin	Flavonoid	Hydroalcoholic extract 19
Quercetin	Flavonoid	Hydroalcoholic extract 19
Kaempferol	Flavonoid	Hydroalcoholic extract 19
Naringenine	Flavonoid	Hydroalcoholic extract 19
Eriodictyol	Flavonoid	Hydroalcoholic extract 19
Diosmetin	Flavonoid	Essential oil 17
Luteolin	Flavonoid	Essential oil 17
Apigenin	Flavonoid	Essential oil 17
5,6,3′-Trihydroxy-7,8,4′-trimethoxyflavone	Flavonoid	Ethyl acetate extract 9
Kaempferol-3-O-glucoside	Flavonoid glycoside	Hydroalcoholic extract 19
Quercetin-3-O-glucoside	Flavonoid glycoside	Hydroalcoholic extract 19
Narigenin-O-hexoside	Flavonoid glycoside	Hydroalcoholic extract 19
Apigenin-glucuronide	Flavonoid glycoside	Water extract 23
Rutin	Flavonoid glycoside	Hydroalcoholic extract 24
Luteolin-7-O-β-glucuronide	Flavonoid glycoside	Hydrophilic extract 22
Eugenol	Phenyl propene	Essential oil 14
Ethyl cinnamate	Ester	Essential oil 14
Sitosterol	Phytosterol	Essential oil 17
Oleanolic acid	Fatty acid	Essential oil 17
Vitamin A	Vitamin	Essential oil 2
Vitamin C	Vitamin	Essential oil 2

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Figure 3. Marjoram active compounds

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Marjoram phenolic compounds

Vanillic acid, gallic acid, ferulic acid, caffeic acid, syringic acid, p- and m-Hydroxybenzoic acid, coumaric acid, neochlorogenic acid, protocatechuic acid, chlorogenic acid, cryptochlorogenic acid, caftaric acid are phenolic acids that have been detected in hydroalcoholic extract of leaves of sweet marjoram ²⁵. Rosmarinic acid, sinapic acid, vanillic acid, ferulic acid, caffeic acid, syringic acid, p- and m-hydroxybenzoic acid, and coumarinic acid have been identified in essential oil of sweet marjoram ². Arbutin, methyl arbutin, vitexin, and orientinthymonin have been reported to be the most predominant phenolic glycosides in essential oil of sweet marjoram.10 Hesperetin, catechin, quercetin, kaempferol, naringenine, eriodictyol, diosmetin, luteolin, and apigenin are the most abundant flavonoids detected in sweet marjoram10,21 and kaempferol-3-O-glucoside, quercetin-3-O-glucoside, narigenin-O-hexoside, and rutin are flavonoid glycosides identified in sweet marjoram ²⁵.

Antioxidant properties of marjoram

It has been suggested that phenolic compounds from marjoram, such as flavonoids and phenolic acids, might exert anti-inflammatory properties (Table 3) ²⁶. In this regard, Mueller et al. ²⁷ evaluated the anti-inflammatory activity of marjoram hydrophilic extracts on lipopolysaccharide (LPS)-stimulated RAW 264.7 macrophage cells. Pre-treatment of the cells with with the extracts from marjoram at 500 μg/mL and 200 μg/mL the levels of IL-6 were reduced 20% and 17%, respectively, while the iNOS expression was diminished 66%. Even though Mueller et al. ²⁷ did not identify the compounds in the marjoram extracts, they mention that diosmetin, apigenin, luteolin and rosmarinic acid are the compounds to most likely be present in the hydrophilic extracts, so these molecules might be responsible for the activity of marjoram extracts.

Table 3. Summary of the antioxidant capacity of flavonoids and phenolic acids of Marjoram

Extract	Compounds	Plant Part	Antioxidant Assay	Reference
Methanol microwave-assisted	Rosmarinic and caffeic acid, apigenin, rutin	Aerial parts	TPC, DPPH, CUPRAC	28
Aqueous, methanol	Rosmarinic and caffeic acids	Leaves	TPC, DPPH, β-carotene bleaching	29
Methanol	Rosmarinic acid, eriodictyol, naringenin, hispidulin, cirsimaritin	Leaves, commercial herbs	TPC, ORAC	30
Methanol	Rosmarinic acid, epigallocatechin, quercetin, apigenin	Not specified	DPPH, FRAP	31
Ethanol	Chlorogenic, ferulic, p-coumaric, p-hydroxybenzoic, protocatechuic, rosmarinic and syringic acids, quercetin	Not specified	TPC, DPPH, ABTS	32

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Pharmacological Activities of Marjoram

Table 4. Pharmacological properties of marjoram in detail

harmacological Activity	Plant part / Extract	Method	Result	Active Constituent
Antioxidant 18	Ethanol, n-hexane, supercritical CO2 and water extract of herb	DPPH method and chemiluminometric method	Antioxidant activities of all extracts	Ursolic acid, carnosic acid, carnosol
Antioxidant 34	Essential oil	DPPH reduction test	Low antioxidant activity with EC50 values >250μg/mL	—
Antioxidant 35	Essential oil	(1) DPPH assay (2) Percent inhibition in linoleic acid system (3) Bleaching of β-carotene	1)IC50 of 89.2 µg/ml 2) 72.8% inhibition of linoleic acid oxidation 3)showed slow rate of color depletion	—
Antioxidant 9	Ethyl acetate extract and isolated compounds	DPPH	Significant antioxidant activities from extract and isolated compounds with IC50 of 2.77 and 1.92 µg/mL, respectively	Hydroquinone
Antioxidant 36	Essential oil / Water extract	ABTS + reducing power were examined for their effect against lipid oxidation in comparison to a tea water extract by measurement of the oil stability index	Remarkable capacity in retarding lipid oxidation with oil stability index 13.9 hours	Bound forms of phenolic compounds such as hydroxycinnamic acid and flavonoids
Antioxidant 19	Hydroalcoholic extract	ABTS + radical decolorization and DPPH assay	Significant antioxidant capacity with 0.84 and 0.33 mmol TE/g DW, respectively	Polyphenolic compounds
Antioxidant 37	Essential oil	Glutathione level and lipid peroxidation content as malondialdehyde in the testis, liver and brain in ethanol treatment male albino rat (ethanol induced reproductive disturbances and oxidative damage in different organs and lipid peroxidation due to the formation of free radicals)	Co-administration of the extract resulted in minimizing the hazard effects of ethanol toxicity on male fertility, liver and brain tissues	—
Antioxidant 38	Essential oil	DPPH, .OH, H2O2, reducing power and lipid peroxidation	IC50 values of 58.67, 67.11, 91.25, 78.67, and 68.75 µg/mL, respectively	—
Antioxidant 39	Water extract	DPPH	High antioxidant capacity	Phenolic compounds
Antioxidant 40	Isolated metabolite	Amyloid β–induced oxidative injury in PC12 nerve cells by MTT, LDH, and trypan blue assays	↓ Amyloid β–induced neurotoxic effect	Ursolic acid
Antioxidant 41	Plant extract	DPPH and ferric ion reducing antioxidant power assays	A direct, positive, and linear relationship between antioxidant activity and total phenolic content of extract	Rosmarinic acid
Antimicrobial 42	Dried whole plant/oil/leaves aqueous extract	MIC	Better antimicrobial activity of essential oil rather than water extract; inhibition of yeast and lactic acid bacteria by essential oil at a concentration of 5 ppm	—
Antimicrobial 43	Essential oil	ND	The most susceptible organisms were Beneckea natriegens, Erwinia carotovora, and Moraxella sp. and Aspergillus niger	—
Antimicrobial 44	n-Hexane extract, aqueous ethanol, ethanolic ammonia extract	Disk-diffusion method for bacteria and serial dilution method for protozoa	n-Hexane extract showed the highest antibacterial activity and the ethanolic ammonia extract reduced the number of viable Pentatrichomonas hominis trophozoites by 50% at 160 µg/ml	—
Antimicrobial 45	Methanol extract	Filter paper disk diffusion method	Considerable activity against Aspergillus niger, Fusarium solani, and Bacillus subtilis with zone of inhibition 40, 28 and 42 mm, respectively	—
Antimicrobial 35	Essential oil	(1) Disk diffusion (2) Resazurin microtitre-plate	(1) Large zone of inhibition (16.5-27.0 mm) (2) Small MIC against Staphylococcus aureus, Bacillus cereus, B subtilis, Pseudomonas aeruginosa, Salmonella poona, Escherichia coli (40.9-1250.3 μg/mL)	—
Antimicrobial 13	Essential oil	Agar diffusion method	Active against Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, and Klebsiella pneumoniae with inhibition zone of 16, 12, 15, and 13 mm, respectively	cis-Sabinene hydrate
Antimicrobial 34	Essential oil	Microdilution	Inhibitory activity against Staphylococcus aureus and Streptococcus pyogenes with MICs of 125 and 250 μg/mL, respectively	—
Antimicrobial 34	Essential oil	Diffusion assay	Growth inhibitory activity against dermatophytes	—
Antimicrobial 46	Methanol extract of leaves	Zone of inhibition	Inhibitory activity against Escherichia coli with 16 mm diameter zone of inhibition	—
Anti-inflammatory 47	Essential oil	THP-1 human macrophage cells activated by LPS or human ox-LDL, and the cytokine secretion and gene expression, in vitro	Suppression of production of pro-inflammatory cytokines (TNF-α, IL-1β, IL-6 and IL-10) and COX-2 and NFκB gene expression	Sabinene hydrate, terpineol
Anticancer 35	Essential oil	MTT assay	Cytotoxic effect against different cancer cell type, such as MCF-7, LNCaP, NIH-3T3 with IC50 s of 70.0, 85.3, 300.5 µg/ml respectively	—
Anticancer 48	Ethanol, methanol and water extract	MTT assay, trypan blue dye exclusion, AO/EB staining and fluorescence microscopical analysis and DNA fragmentation analysis	Significant cytotoxic activity of ethanolic extract on fibrosarcoma cancer cell line HT-1080 and least toxicity on normal human lymphocytes	—
Anticancer  49	Plant extract	Nonradioactive cytotoxicity assay on human lymphoblastic leukemia cell line Jurkat	↓ Viability of cells with increase of concentration of plant extract. Induction of apoptosis through upregulation of p53 protein levels and downregulation of Bcl-2α. Strong radical scavenging activity	—
Anticancer 50	Ethanol extract	(1) Matrigel invasion assays (2) Gelatin zymography assay (3) Chick embryo tumor growth assay	(1) Significant inhibition of migration and invasion of the MDA-MB-231 cells. Induction of homotypic aggregation of cells associated with an up regulation of E-cadherin protein and decrease the adhesion of cells to HUVECs and inhibition of transendothelial migration of cells through TNF-α-activated HUVECs (2) Suppression of activities of MMP-2 and MMP-9 (3) Inhibition of tumor growth and metastasis	—
Anticancer 9	Ethyl acetate extract and isolated compounds	BrdU cell proliferation enzyme-linked immunosorbent assay and xCELLigence assay against C6 and HeLa cell lines	Strong antiproliferative activities against C6 and HeLa cells	Hesperetin, Hydroquinone
Antiplatelet 51	Methanol extract of leaves	Adhesion, aggregation and protein secretion of the activated platelet to laminin-coated plates	40% inhibition of platelet adhesion to laminin-coated wells by ethanol extract at concentration of 200 µg/mL	—
Antiplatelet 52	Methanol extract	Platelet aggregation induced by collagen; ADP, arachidonic acid and thrombin	Strong inhibition of platelet aggregation induced by ADP, arachidonic acid and thrombin	Arbutin
Antiulcer 53	Ethanol extract	Hypothermic restraint stress-, indomethacin-, and necrotizing agents–induced ulcers and pylorus ligated Shay rat-model	↓ Incidence of ulcers, basal gastric secretion and acid output. replenishment of the depleted gastric wall mucus and nonprotein sulfhydryls contents and ↓ malondialdehyde	—
Gastric secretory activity 54	Plant extract	Acid and pepsin secretions in normal Wistar rats	↑ Basal acid and pepsin secretions	—
Cardioprotective activity 55	Leaves powder and aqueous extract	Isoproterenol-induced myocardial infarction in rats	Alleviation of erythrocytosis, granulocytosis, thrombocytosis, ↓ clotting time, ↑ relative heart weight, ↓ myocardial oxidative stress and the leakage of heart enzymes. inhibition of NO production and lipid peroxidation in heart tissues	—
Hepatoprotective activity 17	Essential oil	Pralletrin-induced oxidative stress in rats (prallethrin caused a significant decrease in the activity of SOD, CAT, and GST in liver of rats)	Depletion of serum marker enzymes and replenishment of antioxidative status	—
Antiacetylcholinesterase activities 56	Essential oil	ND	IC50 value was 36.40 µg/mL	—
Anticholinesterase activity 57	Ethanol extract	In vitro	The Ki value was 6 pM, and IC50 value was 7.5 nM	Ursolic acid
Hormonal activity and regulation of menstrual cycle 58	Water extract	25 patients were received marjoram tea or a placebo tea twice daily for 1 month. Hormonal and metabolic parameters measured, including FSH, LH, progesterone, oestradiol, total testosterone, DHEA-S, fasting insulin and glucose	↓ DHEA-S and fasting insulin levels	—

Abbreviations: ABTS: 2, 2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid); ADP, adenosine diphosphate; CAT, catalase; COX, cyclooxygenase; DHEA-S, dehydroepiandrosterone-sulfate; DPPH, 1,1-diphenyl-2-picryl-hydrazyl; DW, dry weight; EC, effective concentration; FSH, follicle-stimulating hormone; GSH, glutathione S-transferase; IC, inhibitory concentration; IL, interleukin; LDH, lactate dehydrogenase; LH, luteinizing hormone; MIC, minimum inhibitory concentration; MMP, matrix metalloproteinase; MTT, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide; ND, not determined; NO, nitric oxide; PCOS, polycystic ovary syndrome; SOD, superoxide dismutase; TE, trolox equivalent; TNF, tumor necrosis factor.

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Antimicrobial Activity

Dried whole marjoram plant and its essential oil and water extract of leaves have demonstrated antimicrobial effect and essential oil was more active against lactic acid bacteria and yeasts than water extract ¹⁶. Essential oil showed inhibitory activity against various pathogenic bacteria and fungi, including Beneckea natriegens, Erwinia carotovera, Moraxella, Aspergillus, Staphylococcus aureus, Streptococcus pyogenes, Bacillus cereus, B subtilis, Pseudomonas aeruginosa, Salmonella poona, Escherichia coli, and dermatophytes ⁵⁹. Methanol extract of sweet marjoram exhibited antimicrobial activity against E, Aspergillus niger, Fusarium solani, and Bacillus subtilis ⁴⁵. The ethanolic ammonia extract reduced the number of viable Pentatrichomonas hominis trophozoites ⁴⁴. cis-Sabinene hydrate in essential oil of sweet marjoram have been claimed to be responsible for antibacterial effect ¹³.

Anti-inflammatory Activity

Sabinene hydrate and terpineol in essential oil of sweet marjoram suppressed the production of Tumor necrosis factor-α (TNFα), interleukin 1β (IL-1β), IL-6, and IL-10 inhibited cyclooxygenase 2 (COX2) and NFκB gene expression ⁶⁰.

Anti-cancer properties of marjoram

Several factors are involved in the onset of cancer such as age, alcohol, cancer-causing substances, diet, hormones, obesity, radiation, tobacco, etc.; and they may play a direct or indirect role in the development and progressions of different types of cancers. The National Cancer Institute ⁶¹ states that in test tube and in animal studies have shown that the increased presence of antioxidants prevents free radical damage that has been associated with cancer development. Plant foods are the most significance source of natural antioxidants; from which, flavonoids and phenolic acids have attracted the most attention as potential therapeutic agents against cancer. Shukla and Gupta ⁶² summarized that the potential anticancer properties of flavonoid and phenolic acid as demonstrated by laboratory studies are due to different mechanisms of action, including antioxidation, induction of detoxification enzymes and inhibition of bioactivation enzymes, estrogenic and anti-estrogenic activity, antiproliferation, cell cycle arrest and apoptosis, promotion of differentiation, regulation of host immune function and inhibition of angiogenesis and metastasis. 5,6,3′-Trihydroxy-7,8,4′-trimethoxyflavone, hesperetin, hydroquinone, arbutin and rosmarinic acid were isolated from the water-soluble ethyl acetate extract of aerial parts of marjoram ⁶³. Hesperetin isolated from Origanum majorana has shown better antiproliferative activity than 5-fluoroacil against Rattus norvegicus brain glioma (C6) and and cervical epithelial carcinoma (HeLa) cell proliferation ⁶³. Ethanol extract of plant have shown significant cytotoxicity against fibrosarcoma cancer cell line, promoting cell cycle arrest and apoptosis of the metastatic breast cell and inhibited the migration and invasion of the MDA-MB-231 cells ⁶⁴. Hesperetin and hydroquinone isolated from sweet marjoram extract have revealed strong antiproliferative activity ⁹. The results showed that the marjoram extract and isolated compounds exhibited significant antioxidant activities. Hence marjoram plant has the potential to be a natural antioxidant in the food industry and an anticancer drug ⁶³.

Antiplatelet Activity

Methanol extract of sweet marjoram leaves inhibit adhesion of platelet to laminin-coated plate ⁶⁵ and strongly inhibited platelet aggregation induced by adenosine diphosphate (ADP), arachidonic acid, and thrombin. Arbutin is responsible for this activity ⁵².

Antiulcerogenetic Effect

Ethanol extract of sweet marjoram significantly decreased the incidence of ulcers, basal gastric secretion, and acid output and replenished the depleted gastric wall mucus ⁵³.

Cardioprotective and Hepatoprotective Activity

Leave powder and extract significantly alleviated erythrocytosis, granulocytosis, thrombocytosis, increase heart weight, and myocardial infarction oxidative stress in isoproterenol treated albino rats ⁵⁵. Essential oil of sweet marjoram depleted serum marker enzymes and replenished antioxidant status in hepatic of rat ¹⁷.

Anticholinesterase inhibitory activity

Essential oil and ethanol extract of sweet marjoram have exhibited acetylcholinesterase (AChE) inhibitor activity ³⁸. Ursolic acid (3 beta-Hydroxyurs-12-en-28-oic acid) is responsible for this effect ⁶⁶. Acetylcholinesterase (AChE) inhibitors, which enhance cholinergic transmission by reducing the enzymatic degradation of acetylcholine, are the only source of compound currently approved for the treatment of Alzheimer’s Disease ⁶⁶. This study ⁶⁶ demonstrated that the ursolic acid of marjoram appeared to be a potent acetylcholinesterase (AChE) inhibitor in Alzheimer’s Disease.

Regulation of menstrual cycle

Sweet marjoram tea significantly reduced dehydroepiandrosterone-sulphate (DHEA-S) and was useful in treatment of polycystic ovary syndrome ⁶⁷. Twenty-five patients were assigned to receive marjoram tea or a placebo tea twice daily for 1 month (intervention group: n = 14; placebo group: n = 11) ⁶⁷. The hormonal and metabolic parameters measured at baseline, as well as after the intervention, were: follicle-stimulating hormone, luteinising hormone, progesterone, oestradiol, total testosterone, dehydroepiandrosterone-sulphate (DHEA-S), fasting insulin and glucose, homeostasis model assessment for insulin resistance and glucose to insulin ratio. Marjoram tea significantly reduced dehydroepiandrosterone-sulphate (DHEA-S) and fasting insulin levels by a mean of 1.4 (0.5) μmol/L and 1.9 (0.8) μU/mL, respectively. In comparison to the placebo group, the change was only significant for DHEA-S but not for insulin. Homeostasis model assessment for insulin resistance was not reduced significantly in the intervention group, although the change was significant compared to the placebo group. The results obtained in the that study show the beneficial effects of marjoram tea on the hormonal profile of polycystic ovary syndrome (PCOS) women because it was found to improve insulin sensitivity and reduce the levels of adrenal androgens. Further research is needed to confirm these results and to investigate the active components and mechanisms contributing to such potential beneficial effects of marjoram herb.

Marjoram essential oil

Monoterpene hydrocarbons, including α and β-pinene, camphene, sabinene, α- and β- phellandrene, ρ-cymene, limonene, β-ocimene, γ-terpinene, terpinolene, α-terpinene, carvone, and citronellol have been detected in marjoram essential oil ¹⁴. Terpinene 4-ol and cis-sabinene hydrate are 2 main oxygenated monoterpenes isolated from marjoram ¹³. Linalool, linalyl acetate, α-terpineol, trans- and cis-carveol, thymol, anethole, geraniol, and carvacrol are other oxygenated compounds identified in essential oil ⁴² and leaves of marjorama ¹¹.

The analysis of the chemical composition of marjoram essential oil samples obtained from different geographical locations indicates that the biological activity is directly related to the concentration of the marjoram essential oil components, which may vary according to the region ⁶⁸, ⁶⁹. Moreover, season, climate, stage of plant development at harvest, and the technique of extraction of the product may influence the quantity of the plant compounds ⁷⁰.

Fifteen compounds were identified in the marjoram essential oil (Table 5). The most abundant compounds were γ-terpinene (25.73%), α-terpinene (17.35%), terpinen-4-ol (17.24%), and sabinene (10.8%). This chemical profile is in accordance with what is reported in the literature, with some quantitative variations. Rodrigues et al. ⁷¹ and Vági et al. ⁷² also reported the presence of terpenes as the major components of the marjoram essential oil. Usually, terpinen-4-ol and γ-terpinene are described as the most abundant compounds in marjoram essential oil and sabinene and α-terpinene are also observed ⁷³.

Table 5. Chemical composition of Marjoram essential oil

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Marjoram essential oil uses

Marjoram essential oil have shown significant results in inhibiting the growth of bacteria and fungi and the synthesis of microbial metabolites ⁷⁵. Because of its antioxidant effects ⁷⁶, marjoram essential oil or marjoram extract can be used in the prevention of central nervous system disorders ⁷⁷. Marjoram essential oil was also able to partially prevent the ethanol-induced decline in sperm quality, testosterone levels, and the weight of reproductive organs in male rats ⁷⁸. Previous studies have reported the potential use of marjoram ethanolic extract as anticancer agent ⁷⁹, whereas the marjoram tea extract has been shown to have immunostimulant, antigenotoxic and antimutagenic properties ⁸⁰. These activities are attributed to the chemical composition, which is characterized as rich in flavonoids and terpenoids – see Tables 2, 3 and 4 above ⁷².

Marjoram Toxicity

Acute toxicity test has demonstrated a large margin of safety of marjoram extract in mice. Emmenagogue (a substance that stimulates or increases menstrual blood flow) properties of sweet marjoram should be of concerned during pregnancy. Marjoram essential oil must not be used by lactating and pregnant women ⁸¹.

Summary

Sweet marjoram is a medicinal plant with various proven pharmacological properties, including antioxidant, antibacterial, hepatoprotective, cardioprotective, antiulcer, anticoagulant, anti-inflammatory, antiproliferative, and antifungal activities. The flowering stems are the medicinal parts. Their constituents include 1% to 2% of an essential oil with a containing terpinenes and terpinols, plus tannins, bitter compounds, carotenes, and vitamin C. These substances give sweet marjoram stomachic, carminative, antispasmodic, and weak sedative properties. Monoterpene hydrocarbons (such as α-pinene, β-pinene, camphene, and γ-terpinene), oxygenated monoterpenes particularly terpinene-4-ol, cis-sabinene hydrate and terpineol, phenolic compounds particularly flavonoids (such as apigenin, hesperetin, quercetin, kaempferol), and phenolic glycosides (such as arbutin) are the active components isolated and detected in marjoram. Figure 3 shows the structure of some main active compounds. Various bioactive compounds have been isolated and identified in O majorana, whereas many active compounds for the traditional medicine uses have not been completely evaluated in clinical trials.

Due to marjoram’s emmenagogue properties, marjoram essential oil must not be used by lactating and pregnant women ⁸¹.

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