INTRODUCTION:

The tall shrub or treespecies referred to as tea trees, or Melaleuca alternifolia, belongs to the Myrtaceae family of plants. It grows naturally in Australia near streams and on low swamplands. It can be found there, as well as in southeast Queensland, the north coast, and nearby hills of New South Wales.

Tea tree

Scientific Classification:

Kingdom: Plantae.

Order : Myrtales.

Family : Myrtaceae.

Genus : Melaleuca.

Species : M. alternifolia.

Bionomial Name:

Melaleuca alternifolia.

Synonyms:

Melaleuca alinariifolia var. alternifolia Maiden and Betche.

Broad-spectrum antimicrobial activity, including Actions that have antibacterial, antifungal, antiviral, and antiprotozoal properties are present in Melaleuca alternifolia Cheel (Myrtaceae)^1,2. TTO is therefore widely used in Australia, Europe, and North America as an active ingredient in shampoos, topical treatments, and hand-cleansing formulations for the purpose of skin infections and other illnesses. Its colour ranges from pale yellow to almost colourless³ and has a camphoraceous smell. These lubricants have used to treat illnesses for countless years.⁴ Topical using essential oils is linked to a quick influx of blood into the system within 10 to 30 minutes⁵. In particular, TTO (melaleuca oil) has demonstrated to be efficient in a range of skin infections and contributes to the management of inflammatory/ immune illnesses affecting the skin. Additionally, it has antioxidant⁶and anti-skin cancer⁷ properties.

History of production:

To cure sore throats or skin conditions, Melaleuca alternifolia leaves were infused^8,9. When the initial findings of Melaleuca alternifolia oil's anti-microbial activity were published in a number of publications in the 1920s and 1930s, the most important positive benefits of the oil came into focus. When Melaleuca alternifolia's antibacterial properties were first noted by Penfold and were judged to be 11 times more active than phenol, the application of tea tree oil in industry was birthed. However, the introduction of antibiotics after World War II reduced the use of traditional remedies, which had a negative impact on the productionof Melaleuca alternifolia (tea tree) oil. The 1970s seemed to be a time of overall resurgence for natural products, and this was reflected in the growth of interest in natural products like tea tree oil. Commercial plantations that produced consistent essential oil products on a wide scale were created in the 1970s and 1980s^10,11. Tea tree Besides oil, derived from Melaleuca dissitiflora and Melaleuca linariifolia, however it is typically distilled from Melaleuca alternifolia for commercial purposes¹¹.

Composition of tree tea oil:

Tea tree oil's composition is governed by the worldwide Organisation for Standardization's (ISO4730) standard. Tea tree oil (Melaleuca alternifolia) has about 100 components in varying quantities. Its primary constituent is terpinen-4-ol, a chemical within the tree tea oil that has antibacterial characteristics. Tea tree oil's ingredients are shown in Table 1³.

Table 1: Ingredients of tea tree oil

Ingredients	Concentrations
terpinen-4-ol	30–48%
γ-terpinene	10–28%
α-terpinene	5–13%
1,8-Cineole	0–15%
α-terpinolene	1.5–5%
α-terpineol	1.5–8%
α-pinene	1–6%
p-Cymene	0.5–8%

Tea tree oil extraction methods:

Tea tree oil extraction techniques: Supercritical CO2 extraction, solvent extraction, and distillation are a few of the several techniques for extracting essential oils.

1) Water extraction:

In this process, boiling water is used as a solvent to extract the carbohydrates, peptides, glycosides, and tannins from the chopped plant material. Roots and barks are typically decocted (simmered), while leaves and flowers are typically steeped. Unfortunately, because it is prone to fermentation, water extracts have a short shelf life. In order to obtain oil, the Bundjalung Aborigines in the region of New South Wales crush and soak tea tree leaves in water for compresses or infusions.

2) Steam distillation:

Today, the process of distilling steam primary method used to extract essential oils. It is the most traditional method of extracting essential oils, quite straightforward, and ideal for distilling leafy materials. By applying this process of extraction, the the essential oil's makeup just slightly changes. Steam distillation is inexpensive, risk-free, and readily recyclable. Therefore, it is employed to gather crude TTO (35 to 45% of Terpinen-4-ol content) ¹². The Melaleuca tree's leaves and terminal branches are used to produce TTO through steam distillation. After drying for 24hours, dry materials are retrieved, and their moisture content is then assessed (representative sampling). An exterior boiler with a 350kg/hr water capacity provides the steam for distillation. The distillation vessel, which has a 1110mm 83 diameter and a 1689mm height, is the essential tool for this procedure. The temperature sensor and the pressure sensor are coupled to a controller, which automatically adjusts the steam flow rate. The distillation vessel's operating conditions are 120°C. and 2 bar in 3hours. Water and essential oil are included in the condenser mixture. Because of the varied specific gravities of water and oil, the separator can be seen to contain two liquid phases. Recovery of the essential oil in the water has been dissolved is not necessary because the amount of essential oil in the distillate water is negligibly little. Figure 1 depicts steam distillation in action.

Fig 1: Steam distillation

3) Vacuum distillation:

In this method, the raw tea tree oil that was acquired during the distillation process is first delivered to the vacuum distillation column's reboiler and heated indirectly using a thermal oil heater to boil the oil. A vacuum generator is linked to the top of distillation tower to lower thepressure in the system. Liquid Separator is positioned infront of vacuum generator and liquid nitrogen is used to chill it in order to totally condense essential oil entrained by vacuum line. Vapour was concentrated at the tower's summit and then transported to the condenser. Figure 2 depicts vacuum distillation in action.

Fig: 2 Vacuum distillation

Application of tea tree oil:

Tea Tree Oil's main component, terpinen-4-ol, which is Melaleuca alternifolia's therapeutic benefits are derived from its leaves. have been discovered to include anClearance of bronchial congestion, antibacterial activities, anti-onychomycosis, and anti-fungal effects, effectiveness in treating whooping cough, sinusitis, asthma, tuberculosis, and anti Terpinen-4-ol's use is restricted due to its inherent abilities to cause allergic reactions when applied topically¹³.Tea tree oil is administered utilising a few carrier systems, as described in Table 2, to lessen skin irritation.

Table 2: Carriers for tea tree oil and its use

Sr. No	Carrier system for tea tree oil	Use
1	Zein nanoparticles ¹³	Anticancerous activity
2	PEG stabilized lipid nanoparticles¹⁴	Antimicrobial activity
3	Topical cream¹⁵	Burn treatment
4	Microemulsion transdermal drug delivery¹⁶	Psoriasis
5	Hydrogel thickened nanoemulsion¹⁷	Anti-inflammatory
6	Microemulsion Based Transdermal Drug Delivery¹⁸	Psoriasis

The immune system is boosted by tea tree oil, which is also useful for treating bronchial infections, dandruff, muscular aches, tension headaches, rheumatic symptoms, and cuts and grazes. It treats vaginal infections as wellsuch as boils, pimples, burns, herpes, and greasy skin, athlete's foot, cold sores, blemishes, and warts on the skin. in general¹⁹. It is also very effective for the genitourinary system. Tea tree oil is used in the various ways.

1) Vaporizers and burners²⁰

Various treatment the tree tea oil is used to treat respiratory conditions like bronchitis, sinusitis, and colds as well as to help the mind recover from stress.

2) In a bath or blended massage oil²⁰

In all respiratory conditions tree tea oil is useful, as well as arthritis, colds, dermatitis, skin infections, scalp disorders, sinusitis, viral infections, nettle rash, kids colds and coughs, bronchitis, and sweaty feet. It can also be diluted and used in the bath or as a massage oil.

3) Applied neatly or in wash²¹

It is extremely beneficial for treating wounds, acne, boils, bed sores, lice, dandruff, and abscesses, and animal or human bites when added to washing water. It can also be rubbed neat with a cotton bud to trouble spots. Apply neatly to the scalp for 40 minutes, then wash the hair to remove lice. For a period of twelve days, this must be repeated every other day. With frequent direct application of a Tea tree oil diluted 2.5%, fungus breakouts including athlete's foot and nail infections (paronychia), as well as vaginal thrush and cradle cap, can be cured.

4) Mouthwash²²

Tea tree oil can be used as a mouthwash to treat tonsillitis, throat infections, gum infections, and mouth ulcers. Garlic eaters also claim that it lessens the odour of smelling like garlic.

5) Lotion or cream²³

Tea tree oil is applicable to treat a variety of skin conditions, including boils, abscesses, acne, bite wounds from humans and animals (although a doctor should also be consulted), dandruff and other scalp conditions, bed sores, diaper rash, and other rashes. Tea tree oil will also help to clear up any fungal, bacterial, as well as viral infections when it is blended into a cream or lotion and applied to the skin. The cellular respiration of E. coli has been demonstrated to be inhibited by tea tree oil, and the oil kills the cells by rupturing bacterial membranes' permeability barriers

Advantages of TTO:

· Industrial Tea tree oil (used in agricultural products, disinfectants, and cleansers).

· Technical Tea tree oil (used in products for animal care)

Disadvantages of TTO:^24,25

1. The American Cancer Society warns that tea tree oil is dangerous to consume and can cause severe rashes, fatigue, confusion, hallucinations, comas, and other health problems. unsteadiness, weakness, vomiting, diarrhoea, and stomach discomfort.

2. Dermatitis brought on by tea tree oil contact due to the numerous oxidation products created when the oil is exposed to light and/or air.

Antimicrobial activity In vitro:

Of all the properties listed, TTO's antibacterial action has garnered the most attention. The traditional use by the Bundjalung Aborigines of northern New South Wales was the first known use of the M. alternifolia plant that probably utilised this feature. To treat coughs and colds, crushed leaves of "tea trees" were inhaled, or they were sprinkled on wounds before a poultice was put. Tea tree leaves were also soaked to create an infusion that was applied topically to treat skin conditions or sore throats. Australian Aboriginals also mention healing lakes in their oral histories, which were actually lagoons where The leaves of Over time, M. alternifolia had fallen and decomposed.

Antifungal Activity:

Only recently have thorough investigations of the TTO susceptibility of fungi been completed. Data were previously relatively fragmented and partial. Early research was therefore mostly restricted to Candida albicans, a model test organism that was frequently used. TTO is now known to be susceptible to a variety of yeasts, dermatophytes, and other filamentous fungi. Fungal conidia, which are known to be relatively resistant to chemical agents, were used in these studies, nonetheless. Conidia that have germinated are much more vulnerable to TTO than are conidia that have not germinated, suggesting that the conidial wall's intact state offers significant defence. Evidence suggests that TTO vapours can change sporulation., as well as to suppress fungal growth.

Mechanism of antifungal action:

The majority of research on the mechanism (s) of antifungal activity has been conducted on C. albicans. TTO also affects C. albicans cells' permeability, with results that are similar to those observed for bacteria. by 30 minutes of being exposed to 0.25% TTO, C. albicans began to absorb propidium iodide, and by 6hours, considerable methylene blue staining and the loss of 260nm light-absorbing components had taken place. Candida glabrata's permeability is also altered by TTO.The oil greatly affects the membrane characteristics of C. albicans, according to additional studies showing that cells treated with 0.25% TTO had significantly improved membrane fluidity. TTO also inhibits C. albicans respiration in a dose-dependent way. After 1.0% TTO treatment, and after 0.25% TTO treatment, respiration was reduced by roughly 95% and 40%, respectively. At a dose of 0.023% TTO. Fusarium solani's respiration rate is 50% reduced. TTO also prevents Saccharomyces cerevisiae, Candida albicans, and C. glabrata from causing medium acidification in response to glucose. The plasma membrane ATPase primarily expels protons from the media, which is powered by ATP produced in the mitochondria. This function's suppression signals that the mitochondrial and/or plasma membranes have suffered damage. These findings support the idea that TTO alters or impairs the function of fungal membranes as part of its antifungal effect. Work demonstrating that the hypothesised mechanism is further supported by Additional research has demonstrated that TTO significantly increases the susceptibility of Diethylstilbestrol was used to block the plasmamembrane ATPase in C. albicans cells, indicating that the plasma membrane ATPase plays a role in defending cells from the lethal or destabilising effects ofTTO. TTO prevents C. albicans from forming germ tubes or converting their mycelium. In two studies, it was demonstrated that the presence of 0.25 and 0.125% TTO completelyimpeded the growth of germ tubes. It was further noted that treatment with 0.125% TTO caused a trend in which blastospores changed from single or singly budding morphologies to multiply budding morphologies over the course of the 4-hour test period. Cells were able to produce germ tubes after the removal of the TTO, demonstrating that the inhibition of germ tube formation was reversible, however there was a delay in germ tube production, indicating that TTO causes a postantifungal impact.

Antiprotozoal activity:

TTO exhibits antiprotozoal action, according to two papers. Leishmania major and Trypanosoma brucei both experienced 50% less growth from TTO at doses of 403 mg/ml and 0.5mg/ml, respectively, compared to controls. Terpinen-4-ol considerably contributed to this activity, according to further studies. TTO at 300mg/ml in another investigation completely destroyed Trichomonas vaginalis cells. Additionally, in vivo anecdotal evidence indicates that TTO may be effective in treating infections caused by Trichomonas vaginalis.

Safety and Toxicity:

Although tea tree oil's antibacterial and anti-inflammatory capabilities have been better understood, less research has been done on the oil's toxicity and safety.

Oral Toxicity:

Studies on animals and reports of human poisoning show that TTO can be hazardous if consumed. Rats given the 50% fatal dose of TTO in a rat model is 1.9 to 2.6ml/kg, whereas 1.5g/kg of TTO caused somnolence and ataxia. There have been cases of oral poisoning in both children and adults. In every instance, patients healed after receiving supportive care without any visible side effects. The literature does not contain any reports of TTO-related human fatalities.

CONCLUSION:

Tea tree oil (Melaleuca alternifolia), which has antibacterial, antifungal, antiviral, anti-inflammatory, and analgesic properties, is frequently used in cosmetics, healthcare, and antiseptic applications. This article explains these applications. Since it is a naturally occurring plant extract, Tea tree (Melaleuca alternifolia) oil is significant. It is also available in a range of formulations, such as gels, lotions, ointments, shampoos, paints, and soups. Despite having some nutritional benefits, the TTO should not be used in large quantities by mouth as it has been proved to be dangerous and can cause diarrhoea and gastrointestinal pain. Tea tree oil is effective in treating skin infections, although it can occasionally trigger allergic responses. TTO can be used as a stimulant to improve the immune system and treat many ailments with remarkable success. Tea tree oil has a variety of uses, both medical and otherwise, which highlights its significance, but more thorough research is still required to fully understand all of its positive elements, including its nutritional qualities.

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Received on 19.06.2023 Modified on 24.10.2023

Res. J. Pharmacognosy and Phytochem. 2024; 16(2):125-129.

DOI: 10.52711/0975-4385.2024.00024