Parkia speciosa

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This entry is adapted from the peer-reviewed paper 10.3390/antiox11020431

Medicinal plants may act as an alternative resource or adjunctive treatment option in the treatment of diabetes and its cardiovascular complications. Parkia speciosa (Fabaceae) is a plant found abundantly in the Southeast Asian region. Extracts of P. speciosa, particularly from its seeds and empty pods, show the presence of polyphenols. They also exhibit potent antioxidant, hypoglycemic, anti-inflammatory, and antihypertensive properties. Its hypoglycemic properties are reported to be associated with the presence of β-sitosterol, stigmasterol, and stigmat-4-en-3-one.

diabetes hypoglycemic antioxidant anti-inflammatory

1. Taxonomical Classification

Kingdom: Plantae; Phylum: Trcheophyta; Class: Magnoliopsida; Order: Fabales; Family: Fabaceae; Genus: Parkia; Species: P. speciosa.

2. Botanical Description

P. speciosa thrives on podzolic sandy loam and in areas near riverbanks in primary lowland rainforests in Southeast Asia. The optimum annual temperature for the proliferation of the plant is 24 °C. The tree is cultivated in the plains up to an elevation of 1500 m. The plant is propagated via seed sowing, stem cutting, and budding ^[1]^[2]. The agronomic practices used for the pretreatment of seeds to overcome dormancy and accelerate seed germination are seed coat shelling or soaking of the seeds in water, ample light, and space provision ^[2]. Seeds are cut opposite to the micropyle to prevent damage to the embryo during seed coat cutting. One year after sowing, at a height of 0.5–1.0 m tall, the trees are transplanted to the field with a distance of 10 m between rows and 10 m between the plants (10 m × 10 m) ^[2]. The mature plant can grow up to 40 m in height and 1 m in stem circumference (Figure 1a). Its leaves are bipinnate and alternate. It is an ornamental, perennial, and fruit-bearing tree which starts to flower and produce fruit at the age of seven years. It usually flowers in January to March and inAugust to October each year. The flowers are bulb-shaped and droop at the stalk ends, while the fruits are green, flat, and oblong pods of 35–55 cm in length and 3–5 cm in width, beetling in bunches of 6–10 (Figure 1b,c). The seeds have a foul, peculiar, unique, and distinctive smell with an elliptical shape, and can be eaten raw, roasted, cooked, or blanched ^[3]^[4]. The seed has a unique taste similar to that of garlic; it has no burning spiciness or pungency, and also has a unique Shiitake-mushroom-like flavor ^[5]. P. speciosa has been reported to have bioactive compounds, particularly thiazoline-4-carboxylic acid, also known as thioroline, which is an amino acid that gives P. speciosa seed its sulfur smell ^[6]^[7].

Figure 1. The tree (A), pods (B), and seeds (C) of P. speciosa plants.

3. Traditional Medicinal Uses of P. speciosa

P. speciosa is a valuable herbal plant consumed by the Southeast Asian communities as a cooking ingredient and for various medicinal purposes. In Malaysia, its’ seeds have always been a popular ingredient in cooking, where they are usually served with chili paste or “sambal”, dried shrimp, and chili pepper as a popular local delicacy. It can be cooked in chili paste mixed with seafood, boiled in coconut milk with a variety of vegetables, or added as an ingredient to many other dishes, including fried rice or stir-fried food ^[3]^[2]. It is traditionally used in several ways for the treatment of diabetes and hypertension ^[8]^[9]^[10]^[11]. It was reported previously that the P. speciosa seeds, pods, and roots were traditionally applied by indigenous communities in Peninsular Malaysia to treat diabetes and hypertension ^[11]. Furthermore, P. speciosa has also been consumed for the treatment of skin-related diseases such as eczema, skin ulcers, measles, leprosy, wound, dermatitis, chickenpox, scabies, and ringworm ^[4]^[12]^[13]. Table 1 summarizes the traditional uses of P. speciosa.

Table 1. Traditional uses of P. speciosa. Adapted from Saleh et al. (2021) ^[4].

Plant Part	Method of Preparation	Traditional Uses	Region/Country	References
Seeds	Eaten raw or cooked oral decoction	Diabetes	Malaysia	^[4]^[11]
	Eaten raw	Diabetes	Singapore	^[4]^[14]
	–	Loss of appetite	Indonesia	^[15]
	Cooked	Kidney disorder	West Malaysia	^[16]
Leaves	Pounded with rice and applied on the neck	Cough	Malaysia	^[17]
	Decoction	Dermatitis	Indonesia	^[4]^[12]
	–	Dermatitis	Indonesia	^[15]
Root	Decoction	Skin conditions	Southern Thailand	^[13]
	Decoction is taken orally	Hypertension and diabetes	Malaysia	^[11]^[17]
	Oral decoction	Toothache	Malaysia	^[18]

4. Phytochemistry

The bioactive compounds in plants can be classified into primary and secondary metabolites. Primary metabolites play a significant role in growth, development, or reproduction via molecules like amino acids, carbohydrates, and lipids ^[19]^[20]. The secondary metabolites derived from plants include flavonoids, alkaloids, saponins, triterpenes, tannins, and phytosterols; all of these are used by plants in their defense mechanisms ^[19]^[21]. P. speciosa also contains various types of polyphenols and flavonoids, which are believed to be potential sources of bioactive compounds beneficial to health. Table 2 documents the phytochemical compounds identified from different parts of the P. speciosa plant using different types of extraction solvents.

Table 2. Phytochemical compounds extracted from P. speciosa plants. Adapted from Saleh et al. (2021) ^[4].

Polyphenols	Plant Part	Extract	Country	References
Quercetin, rutin, kaempherol, catechin, luteolin, myricetin, gallic acid, caffeic acid, ferulic acid, trans-cinnamic acid, p-coumaric acid	Seed	Ethanol	Malaysia	^[22]
Gallic acid, catechin, chlorogenic acid, vanillic acid, caffeic acid, epicatechin, kaempferol, ellagic acid, cinnamic acid, ferulic aid, p-coumaric acid, quercetin	Pod	Aqueous, ethanol	Malaysia	^[23]
Lupeol, β-sitosterol, stigmasterol, stigmasterol methyl ester, stigmasta-5,24(28)-diene-3-ol, campesterol, arachidonic acid, linoleic acid chloride, linoleic acid, squalene, lauric acid, stearic acid, oleic acid, myristic acid, lanthionine, ethyl linoleate, ethyl stearate, 3-ethyl-4-nonanol, eicosanoic acid, elaidic acid, 2-nonade-canone, 2-pyrrolidi-none, 2-decanal, cyclo-decanone-2,4-decadienal, Hexaminde, vitamin E	Seed	Supercritical carbon dioxide	Malaysia	^[24]
Apigenin, nobiletin, tangeritin, rutin, didymin, punicalin, coutaric acid, caftaric acid, malvidin, primulin	Pod	Methanol	Malaysia	^[25]
β-sitosterol, stigmasterol, stigmasterol methyl ester, campesterol, arachidonic acid, linoleic acid, linoleic acid chloride, linoleic acid, squalene, stearic acid, oleic acid, palmitic acid, myristic acid, undecanoic acid, stearolic acid, linoleaidic acid methyl ester	Seed	–	Malaysia	^[26]
1,3-dithiabutane, 2,4-dithiapenthane, 2,3,5-trithiahexane, 2,4,6-trithiaheptane, pentanal	Seed	Aqueous	Indonesia	^[27]
1,2,4-trithiolane, 1,3,5-trithaine, 3,5-dimethyl-1,2,4-trithiolane, dimethyl tetrasulfid, 1,2,5,6-tetrahio-cane, 1,2,3,5-tetrathiane, 1,2,4,5-tetrathiane, 1,2,4,6-tetrathie-pane, lethionine	Seed	Hexane	Singapore	^[28]

References

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