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Suaeda maritima

Suaeda maritima is an annual herbaceous plant in the family Amaranthaceae, commonly known as herbaceous seepweed, annual seablite, or white sea-blite, characterized by its prostrate to erect, glaucous or green stems that form mats up to 10 dm tall, linear leaves 10–50 mm long, and small bisexual flowers in dense glomerules.^[1]^[2] The plant often turns reddish with age, particularly in dense populations, and produces lenticular seeds 1–2.2 mm in diameter that exhibit dimorphism, aiding its adaptation to variable saline conditions.^[1]^[2] This polymorphous species thrives in coastal salt marshes, intertidal mud- and sand-flats, open saline loamy flats, and behind mangroves, typically at elevations of 0–10 m, where it acts as an early colonizer of disturbed saline habitats.^[1]^[2]^[3] It is widely distributed across Europe, Asia, Africa, North America (from Quebec to Louisiana and introduced in parts of the Atlantic coast), and the Pacific Islands including Japan and New Zealand, with both native and naturalized populations.^[1]^[2] In North America, subspecies such as S. m. ssp. maritima are often considered European introductions. Ecologically, Suaeda maritima is a halophyte with high salt tolerance, utilizing sodium ions as osmolytes for osmotic adjustment, accumulating betacyanins to combat oxidative stress, and demonstrating succulence to dilute toxic ion concentrations in saline soils with electrical conductivity up to 18 dS m⁻¹.^[4] It flowers from late summer to fall, reproduces via wind-pollinated flowers and dimorphic seeds that enhance survival in fluctuating environments, and frequently associates with species like Salicornia in high-salinity zones (>18 ppt).^[1]^[4]^[3] These adaptations enable it to rapidly dominate post-disturbance sites in coastal ecosystems, contributing to biodiversity in wetland habitats.^[5]

Taxonomy

Classification

Suaeda maritima is classified in the kingdom Plantae, phylum Tracheophyta, class Magnoliopsida, order Caryophyllales, family Amaranthaceae, genus Suaeda, and species S. maritima.^[6] This placement aligns with the APG IV system, which merges the former Chenopodiaceae into Amaranthaceae.^[2] The species was first described by Carl Linnaeus as Chenopodium maritimum in his 1753 work Species Plantarum.^[7] It was later reclassified in the genus Suaeda as S. maritima by Belgian botanist Barthélemy Charles Joseph Dumortier in his 1827 Flore Belgique.^[7] The genus Suaeda comprises approximately 80–100 species of primarily halophytic plants distributed worldwide, belonging to the subfamily Suaedoideae within Amaranthaceae.^[8]^[9]

Synonyms and Subspecies

Suaeda maritima has several historical synonyms reflecting its reclassification within the Chenopodiaceae (now Amaranthaceae), including Chenopodium maritimum L., Salsola maritima (L.) Dumort., Chenopodina aestuaria Dumort., Dondia maritima (L.) Druce..^[10]^[1] Common names for the species include herbaceous seepweed, annual seablite, and white seablite, with regional variations such as herbaceous sea-blite in parts of North America and sea blite in Europe..^[11]^[1]^[12] Two subspecies are recognized: S. maritima subsp. maritima, which is widespread across Europe, Asia, and Africa and often introduced in North America with seeds 1.5–2 mm in diameter and chromosome number 2n=36; and S. maritima subsp. richii (Fernald) Bassett & Crompton, native to eastern North America from Newfoundland to Massachusetts, characterized by smaller seeds (1–1.5 mm), procumbent mat-forming habit, and chromosome number 2n=18..^[1]^[13] The species exhibits significant polymorphism, contributing to taxonomic debates over infraspecific variation and regional endemism; for instance, subsp. richii is considered rare outside its core Atlantic coastal range, particularly in New England where it occurs sporadically in salt marshes..^[1]^[13]^[14]

Description

Morphology

Suaeda maritima is an annual herbaceous plant that exhibits an erect or sprawling growth habit, typically reaching heights of 10–60 cm, though it can form mats or clumps up to 100 cm in some conditions.^[1]^[12] The stems are succulent and fleshy, initially green but often turning reddish or purplish in autumn due to the accumulation of betacyanin pigments, which provide a distinctive coloration to mature plants.^[15]^[16]^[17] The leaves are simple, alternate, and sessile, with a cylindrical or semi-terete shape that contributes to their succulent nature. They measure 10–50 mm in length and 0.8–2 mm in width, are glabrous, and often develop a reddish hue when mature, again attributable to betacyanin pigments.^[12]^[15]^[16] These leaves are adapted for water storage, enhancing the plant's resilience in saline environments through their fleshy texture.^[1] Flowers are small and inconspicuous, measuring 2–3 mm in diameter, and are typically green, forming clusters of 1–5 in axillary spikes along the upper stems. Each flower is bisexual with five fleshy sepals that form a cup-like perianth, and they are sessile and hypogynous.^[12]^[15] The fruits are utricles, dry and indehiscent, enclosing a single black, lens-shaped seed approximately 1–2.2 mm in size with a reticulate seed coat.^[1]^[12] The root system consists of fibrous roots that are shallow but extensive, forming a network suited to the upper layers of saline soils where they provide anchorage and facilitate nutrient uptake in marshy habitats.^[18]

Physiological Adaptations

Suaeda maritima, a euhalophyte, exhibits several halophytic traits that facilitate survival in saline environments. Its leaves are succulent, enabling water storage and dilution of accumulated ions to maintain cellular turgor without compromising metabolic functions. Unlike some halophytes with salt-excreting glands or bladders, S. maritima primarily accumulates excess salts intracellularly, compartmentalizing sodium ions (Na⁺) into vacuoles via transporters such as Na⁺/H⁺ antiporters (NHX1) to prevent cytoplasmic toxicity. Additionally, it synthesizes and accumulates organic osmolytes, including proline and glycine betaine, which contribute to osmotic adjustment by balancing external salinity without disrupting enzyme activity; for instance, glycine betaine levels can reach over 25 mM per kg fresh weight under 400 mM NaCl stress.^[19]^[20]^[19] In response to elevated salinity, S. maritima actively absorbs Na⁺ through low-affinity uptake pathways in the roots, including a high-affinity K⁺ transporter at low salinity (e.g., 25 mM NaCl) and an AKT1-type channel at higher levels (e.g., 150 mM NaCl), followed by transport to shoots for osmotic regulation. This ion influx maintains a favorable Na⁺/K⁺ ratio, with shoot Na⁺ concentrations increasing significantly under stress while K⁺ levels are preserved via selective uptake. As salt saturation occurs, leaves turn red due to the accumulation of betacyanins, pigments that serve as antioxidants and osmoprotectants, signaling physiological adjustment to extreme conditions. The species demonstrates robust salt tolerance, sustaining growth up to 500 mM NaCl, with optimal performance between 200 and 400 mM.^[19]^[21]^[20]^[22] Photosynthetically, S. maritima employs a C3 pathway, lacking the Kranz anatomy typical of C4 plants, yet it maintains efficiency under saline stress through adaptive adjustments in chlorophyll content and photosynthetic rates, which peak at intermediate salinities (e.g., 200–400 mM NaCl) before declining at higher levels due to stomatal limitations. This pathway supports carbon fixation in hypoxic, saline soils by optimizing CO₂ assimilation without the specialized bundle sheath cells found in C4 relatives within the genus.^[23]^[21]^[24] To counter oxidative stress induced by salinity-generated reactive oxygen species (ROS), S. maritima upregulates antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX), which scavenge ROS and protect cellular components like membranes and proteins. For example, SOD activity increases under NaCl stress to convert superoxide radicals to less harmful forms, while genes such as SsCAT1 and SsAPX are transcriptionally activated, enhancing overall resilience. These responses, combined with osmolyte-mediated stabilization, enable the plant to mitigate lipid peroxidation and maintain metabolic integrity in high-salinity habitats.^[19]^[20]^[19]

Habitat and Distribution

Preferred Habitats

Suaeda maritima thrives in saline, poorly drained soils characteristic of coastal salt marshes, tidal flats, and the fringes of coastal dunes, where it encounters high sodium chloride concentrations often exceeding 200 mM.^[25]^[12]^[20] This halophyte exhibits strong tolerance to periodic inundation, enduring hypoxic conditions in waterlogged sediments up to the levels of high spring tides in the intertidal zone, which supports its adaptation to brackish and saltwater environments.^[20]^[12] As a pioneer species, S. maritima plays a key role in stabilizing nascent marsh surfaces by trapping suspended sediments during tidal flows, thereby facilitating accretion and the development of more mature halophytic communities.^[26]^[27] It commonly associates with other salt-tolerant plants such as Spartina alterniflora and Salicornia species in these dynamic ecosystems, contributing to the overall structure of high and low marsh zones.^[25]^[28] The plant prefers temperate to subtropical climates with full sun exposure and mild temperatures ranging from 10°C to 25°C for optimal growth, while tolerating a soil pH between 6.5 and 8.5 in alkaline, saline conditions.^[12]^[29]^[30] In its habitats, S. maritima faces threats from accelerated sea-level rise, which can exacerbate inundation and alter sediment dynamics, as well as changes in hydrology from human interventions; however, it demonstrates resilience to grazing pressure, which may even enhance marsh stability by reducing biomass and erosion.^[31]^[32]^[33]

Global Distribution

Suaeda maritima is native to Eurasia, encompassing Europe, North Africa from Morocco to Egypt, Asia Minor, Central Asia, and extending eastward to temperate regions of Asia including Indo-China. In the Palearctic realm, it is widespread across coastal and inland saline habitats from Macaronesia, including the Canary Islands and Cape Verde, to western Siberia. Additionally, the subspecies S. maritima ssp. richii is native to eastern North America, occurring along the Atlantic coast from Newfoundland and Nova Scotia southward to Massachusetts.^[10]^[12]^[1] The nominate subspecies, S. maritima ssp. maritima, has been introduced to North America, where it is established along the eastern seaboard from Quebec and New England to Virginia, with scattered populations extending southward to Florida and Louisiana along the Gulf Coast. This introduction likely occurred through natural dispersal mechanisms, as the species' fruits and seeds are adapted for long-distance transport by floating on water or adhering to birds. It has also been introduced to Australia, primarily in Tasmania, and to parts of South America, though its status in the latter remains debated with some populations possibly representing distinct varieties. It is also naturalized in the Pacific Islands, including Japan and New Zealand.^[34]^[10]^[35]^[1] In its native European range, Suaeda maritima is abundant and commonly encountered in salt marshes, such as those in the United Kingdom, where it frequently colonizes intertidal mudflats and lower marsh zones alongside species like Salicornia. In contrast, populations in North America are less common overall; the introduced ssp. maritima persists in disturbed saline sites but does not dominate, while the native ssp. richii is rarer and considered vulnerable globally, with state-level conservation listings as endangered or threatened in Massachusetts, Maine, New Hampshire, and Rhode Island due to habitat loss and limited distribution.^[3]^[36]^[14]^[12]

Life Cycle and Reproduction

Development Stages

Suaeda maritima, an annual halophyte, initiates its development with seed germination typically occurring in spring, from late March to April in temperate regions such as the United Kingdom. This follows a dormancy period of approximately five months, spanning late October to late March, during which seeds endure saline, waterlogged, hypoxic, and cold conditions (soil temperatures below 15°C) in coastal salt marsh environments. Germination requires cold stratification to break dormancy and is triggered by rising temperatures of at least 15°C, with optimal rates at around 20°C; low salinity enhances percentage germination, though seeds tolerate up to 600 mM NaCl. Hypocotyl emergence begins about six days after imbibition under suitable conditions, with the majority completing within 7 to 14 days, often in a single flush lasting 2 to 3 weeks when soil salinity is minimal.^[37]^[38]^[39]^[40] Following germination, the vegetative growth phase dominates the summer period, characterized by rapid stem elongation and leaf production as the plant establishes and expands. Seedlings transition to active growth within 2 to 3 weeks of establishment, reaching full height—typically 30 to 100 cm—by mid-season through prostrate to ascending stems that form dense mats in saline habitats. Biomass accumulation accelerates under moderate salinity (e.g., 200 mM NaCl), where growth rates are higher compared to non-saline conditions, reflecting the plant's adaptation as a halophyte that allocates resources primarily to succulent leaves and stems for osmotic adjustment. This phase lasts several months, with the overall active growth spanning March to October in temperate zones, though total vegetative development is compressed to support the annual cycle.^[30]^[41]^[21]^[42] As autumn approaches, Suaeda maritima enters senescence, marked by dieback and reddening of stems to purplish-red hues, signaling the shift of remaining biomass toward reproductive structures like flowering, which begins in late summer. The plant completes its life cycle within 3 to 6 months from germination to maturity, varying by latitude and local conditions; in temperate areas, this aligns with the growing season's end by October. Environmental factors significantly influence duration: elevated salinity promotes faster overall growth and shorter cycles by enhancing photosynthetic efficiency, while drought or early frost can truncate development and reduce biomass.^[43]^[44]^[30]^[21]

Reproduction

Suaeda maritima exhibits hermaphroditic flowers arranged in dense axillary inflorescences, typically containing 9–18 flowers per leaf axil.^[45] Flowering occurs from July to October in temperate regions, aligning with late summer to autumn conditions that favor reproductive development in salt marsh environments.^[45] The flowers are small and inconspicuous, with a single ovule per flower, and display protogynous dichogamy, where the pistillate phase precedes the staminate phase, reducing self-pollination.^[45] This temporal separation promotes outcrossing despite the species being self-compatible.^[45] Pollination in S. maritima is primarily anemophilous, relying on wind for pollen transfer, particularly in higher salt marsh zones where air currents facilitate dispersal.^[45] The flowers produce substantial pollen, averaging 19,090 grains per flower, supporting effective wind-mediated pollination.^[45] In lower marsh areas, water currents may assist in pollen movement, while occasional insect visitors, such as bees, wasps, and flies, contribute to entomophilous pollination by foraging on pollen and nectar, though this is secondary to wind.^[45] The mixed pollination system enhances reproductive assurance in variable coastal habitats. Seed production is characterized by high fecundity, with open-pollinated plants achieving fruit set rates of 93–95%, resulting in up to approximately 140 seeds per plant under optimal conditions in low marsh populations.^[45]^[46] Seeds are dimorphic, consisting of black (larger, physiologically dormant, higher salinity tolerance during germination) and brown (smaller, non-dormant, faster germinating) lenticular types, 1–2.2 mm in diameter, with a reddish-brown or black reticulate coat; this bet-hedging strategy promotes persistence in fluctuating environments.^[1]^[40] As an annual species, S. maritima relies entirely on sexual reproduction, lacking clonal propagation.^[35] Seeds enter a dormancy period of about 5 months post-dispersal, typically from late October to late March, during which fluctuating environmental conditions—including salinity, hydration, and temperature influenced by tidal cycles—break dormancy to synchronize germination with spring tides.^[37] Dispersal mechanisms in S. maritima include hydrochory, where buoyant fruits and seeds float on tidal waters, enabling spread across salt marshes and coastal areas.^[45] The entire plant may break off and tumble, shedding diaspores as it rolls.^[45] Zoochory via birds also occurs, with waterfowl like great cormorants facilitating secondary dispersal of intact seeds over longer distances.^[47] These strategies contribute to the species' transient soil seed bank, with limited long-term persistence due to high germination rates upon favorable conditions, though some viability can extend under controlled storage.^[31]^[48]

Uses

Food

Suaeda maritima young leaves and shoots are the primary edible parts, consumed raw in salads or cooked as greens, offering a pleasant salty flavor reminiscent of spinach. The seeds can also be eaten raw or ground into flour for use in baking or as a mush.^[42]^[49] Nutritionally, the leaves are rich in minerals including sodium, potassium, calcium, and iron, as well as vitamins A, C, and E; for instance, vitamin C content can reach up to 249.6 mg/100 g in dried samples, while vitamin A levels exceed 9000 µg/100 g in fresh leaves. The seeds provide substantial lipids, approximately 20% oil content rich in unsaturated fatty acids, and protein levels up to approximately 27% in related species within the genus.^[43]^[50]^[51]^[52]^[53] In traditional culinary practices, S. maritima is utilized in coastal Europe, including France, Spain, and the Basque region, where it serves as a vegetable or flavoring agent, and in Asia, particularly Thailand, featured in dishes like seablite salad, curry with crabs, and scalded preparations with chili paste. Historically, the ashes of burned plants have been employed as a soda source for soap production or as a salt substitute due to their high mineral content.^[43]^[54]^[55] Preparation methods often involve boiling or scalding the leaves for 5 minutes in water with added sugar to mitigate excessive saltiness, enhancing palatability for salads or soups; harvesting during the rainy season yields less saline plants.

Medicine

In traditional Thai medicine, the roots of Suaeda maritima are used to treat skin diseases, alleviate allergic symptoms, and heal abscesses.^[56] Folk medicinal practices in various regions also employ the plant for skin ailments, rheumatism, and snake bites.^[57] The juice extracted from the plant has been traditionally applied for hepatitis treatment, leveraging its reported hepatoprotective properties.^[58]^[59] Pharmacological studies have demonstrated antioxidant activity in S. maritima extracts, particularly through DPPH radical scavenging assays, attributed to polyphenolic constituents.^[60] Anti-inflammatory effects are evident in ethanol extracts, which inhibit nitric oxide production in LPS-stimulated macrophages at concentrations comparable to triamcinolone acetonide.^[61] The plant exhibits antiviral and hepatoprotective potential, with leaf extracts protecting against hepatitis-induced liver damage in models.^[62] Antibacterial activity targets pathogens such as Escherichia coli and Klebsiella pneumoniae, with inhibition zones ranging from 7 to 12 mm in crude extracts.^[63]^[62] Antidiabetic effects include α-glucosidase inhibition by methanol extracts, supporting its role in managing postprandial hyperglycemia.^[64] Bioactive compounds in S. maritima include flavonoids, alkaloids, tannins, and glycosides, identified in root and leaf extracts through phytochemical screening.^[65]^[66] Betacyanins contribute to its pigmentation and antioxidant profile, though primarily studied in related Suaeda species under stress conditions.^[67] In vitro studies from 2020 to 2024 reveal cytotoxicity of methanol and sequential extracts against cancer cell lines, including lung and breast cancers, with IC50 values indicating potent antiproliferative effects.^[68]^[60] Research on S. maritima remains predominantly in vitro, with limited clinical trials to validate efficacy and safety. A 2024 study highlights its potential in skin treatments, as root extracts promote wound healing, reduce inflammation, and enhance telomerase activity for anti-aging applications.^[69]

References

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An annual herb found in the middle and lower parts of saltmarshes, often with Salicornia species. It is an early colonist of intertidal mud- and sand-flats.<|control11|><|separator|>
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Physiological Adaptation of Three Wild Halophytic Suaeda Species
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### Summary of Salt Tolerance and Related Conditions for Suaeda maritima
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Seablite (Suaeda maritima) Product for Cooking, Samut Songkram ...
Discover the potential of Seablite in Samut Songkram, Thailand. Explore its culinary uses, nutritional values, and health benefits.
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The salt-tolerance mechanism of the genus Suaeda is very complicated, involving cells, tissues, and organs, and the whole plant, being the result of the ...
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Chemical Composition and Nutritional Evaluation of the Seeds of <i ...
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(PDF) Seablite ( Suaeda maritima ) Product for Cooking, Samut ...
Aug 6, 2025 · ... Nutritionally, S. maritima leaves contain dietary fiber, vitamins A and E, protein, calcium, and iron [3] . Additionally, these ...
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[PDF] antioxidant and anti-inflammation activities of ethanol extract from ...
Seablite or Suaeda maritima (L.) Dumort, a salt marsh plant growing in ... are used in traditional medicine in Asia, Europe and Africa to treat ...
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Evaluation of Phytochemicals and Bioactive Properties in Mangrove ...
In folklore medicine, the Suaeda group of plants are used as fodder (Ishnava et al., 2011) against rheumatism, paralysis, asthma, snake-bites, skin disease ...
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[PDF] Journal of Pharmaceutical Research and Reports
Aug 31, 2023 · In folklore medicine, the Suaeda group of plants are used as fodder against rheumatism, paralysis, asthma, snake bites, skin disease and ...
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Suaeda Maritima | Mangrove Associate | Antimicrobial Activity | GC-MS
Local people use mangrove plant extracts for centuries as the folk medicine for curing many health disorders [4,5]. Suaeda maritima (L.)
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Evaluation of cytotoxic and antioxidant activities of different polarities ...
Suaeda maritima is a folk medicine used traditionally to treat malaria. •. To evaluate the antioxidant activity of plant extracts by applying DPPH. •. To ...
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ANTIOXIDANT AND ANTI-INFLAMMATION ACTIVITIES OF ...
Sep 20, 2022 · There was 0.6 time of anti-inflammation activity from triamcinolone acetonide at same concentration (0.1 mg/ml). Ethanol extract of S. maritima ...Missing: pharmacological | Show results with:pharmacological
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Bacteriostatic and antidiabetic activities of various extracts from the ...
Jan 5, 2024 · The leaf of S. maritima has been used as a hepatitis medicine [7] and it is reported that the plant has antiviral activity [8,9,10,11]. The ...
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Antibacterial activity of different crude extracts of Suaeda maritima ...
Suaeda maritima is a medicinal plant species used to tract hepatitis. ... Traditionally, plants and their products are used as a folk medicine for the ...<|separator|>
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Phytochemical Screening, In Silico Molecular Docking, ADME ...
Feb 29, 2024 · ... Antidiabetic Activity of Marine Halophyte Suaeda maritima (L.) ... inhibition and α-glucosidase inhibition methods revealed that the ...
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Root of Seablite (Suaeda maritima), the Medicinal Halophyte for ...
Seablite (Suaeda maritima) is a salt marsh plant, which grows near mangrove forests located on the coast of the Thai Gulf and Southern Thailand.Missing: minerals sodium potassium
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In vitro bioactivity and phytochemical screening of Suaeda maritima ...
Screening of phytochemicals showed presence of carbohydrates, protein, tannins, alkaloids and flavonoids in comparatively higher amount than other ...Missing: compounds | Show results with:compounds
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Betacyanin Accumulation in the Leaves of C3 Halophyte Suaeda ...
H2O2 treatments led to the most significant betacyanin accumulation in the shoots of Suaeda salsa seedlings when seeds were watered with H2O2 solution. The ...
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In vitro evaluation of phytochemical, antioxidant, anti-inflammatory ...
Jun 3, 2025 · S. maritima methanol extract shows potent antioxidant, anti-inflammatory, and anticancer properties, especially against lung cancer cells.
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Root of Seablite (Suaeda maritima), the Medicinal Halophyte ... - NIH
Jul 31, 2024 · Total phenolic content (TPC) and total flavonoid content (TFC) were 191.3 ± 3.55 mg GAE/g and 21.2 ± 2.09 mg QE/g, respectively. SMRE preferably ...Missing: culinary profile