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Family Fabaceae
Pataning dagat
Canavalia rosea (Sw.) DC.

Hai dao dou

Scientific names Common names
Canavalia apiculata Piper Lagaylai (Bis.)
Canavalia arenicola Piper Magtambokau (Bis.)
Canavalia baueriana Endl. Katang-katang (Tag.)
Canavalia emarginata (Jacq.) G.Don Pataning dagat (Tag.)
Canavalia maritima Thouars Bay bean (Engl.)
Canavalia miniata (Kunth) DC Bay pod (Engl.)
Canavalia moneta Welw. Beach bean (Engl.)
Canavalia obcordata Voigt Coastal jack bean (Engl.)
Canavalia obtusifolia (Lam.) DC. Greater sea bean (Engl.)
Canavalia obtusifolia var. emarginatus (Jacq.) DC. Fire bean (Engl.)
Canavalia podocarpa Dunn. Jack bean (Engl.)
Canavalia rosea (Sw.) DC. MacKenzie bean (Engl.)
Canavalia rutilans DC. Seaside jack bean (Engl.)
Clitoria rotundifolia Sessé & Moc. Seaside sword bean (Engl.)
Dolichos emarginatus Jacq.  
Dolichos litoralis Vell.  
Dolichos maritimus Aubl.  
Dolichos miniatus Kunth  
Dolichos obcordatus Roxb.  
Dolichos obovatus Schumach. & Thonn.  
Dolichos obtusifolius Lam.  
Dolichos ovalifolius Schumach. & Thonn..  
Dolichos roseus Sw.  
Dolichos rotundifolius Vahl  
Glycine rosea G.Forst.  
Mucuna rutilans DC.  
Rhynchosia rosea DC  
Canavalia rosea (Sw.) DC. is an accepted species. KEW: Plants of the World Online

Other vernacular names
CHINESE: Hai dao dou.
FIJIAN: Dralawa, Dautolu.
FRENCH: Pois maritime.
GUAM: Akankang tasi.
HAWAIIAN: 'Awikiwiki, Puakauhi.
INDONESIAN: Kekara laut, Joa-joa dowongi.
JAPANESE: Nagami hama nata mame.
MALAYSIA: Kacang rang-rang, Kacang laut.
SPANISH: Friol de playa.
TAMIL: Kaathuthambattan.
THAI: Kaitia, Thua khla.
VIETNAMESE: D[aaj]u dao bi[eer]n, D[aa]y d[aaj]u.

Gen info
- Canavalia is a genus of plants in the legume family Fabaceae, comprising approximately 62 species of tropical vines. Members of the genus are called jack-beans. Distribution is pantropical. (20)
- Etymology: The genus name Canavalia derives from the Malabar vernacular name, kanavali, for climbing herbs or sub-shrubs. The specific epithet derives from Latin rosea, meaning "rose-like", referring to the pink flowers. (18)

Pataning-dagat is a vigorous prostrate twining vine with sparsely puberulent stems. Leaves are alternate, compounded and long-petioled with 3 broad obovate leaflets, 2 to 15 centimeters long. The inflorescence is a long peduncled raceme with a few paired pink-purple pea type flowers about 4 centimeters long. Stamens are ten in number united into a tube covering the elongated ovary. The pods are rough, turgid, 8 to 12 centimeters long and 2 to 3 centimeters wide with fairly large seeds. New plants start vegetatively from runners.

- Native to the Philippines.
- Found along tidal streams, brackish swamps and muddy banks throughout the Philippines.
- The flowers are wind pollinated.
- Seeds are dispersed from the pods and transported by water to distant places.
- Found in most coastal tropical beaches, cliffs, and dunes.

• Plant yields alkaloids, phenols, saponins. Leaves yield cyanogens.
• An active principle, L-betonicine has been isolated, with no conclusive hallucinogenic evidence.

• Assessment of biochemical and protein quality of thermally treated seeds showed protein and energy values surpassing common pulse crops. Fatty acids and carbohydrates in test seeds were superior to those of soybean; and essential amino acids phenylalanine and lysine of treated seeds were higher than WHO/FAO reference. (6)
• Proximate and mineral composition of seed flours on dry weight basis yielded in gms or mg per 100 gr: moisture 9.3 ± 0.13%, crude protein 34.1 ±0.52 g; crude lipid 1.7 ± 0.1 g; crude fiber 10.2 ± 0.18 g; ash 3.5 ± 0.18 g; crude carbohydrate 50.5 ±0.53 g; energy value 1586 ± 8 KJ; total protein 29.3 ± 0.6 g; sodium 47.96 ±0.73 mg; potassium 974.32 ± 5.99 mg; calcium 86.16 ± 4.27 mg; phosphorus 158 ± 2.28 mg; magnesium 23.13 ± 0.o2; zinc 13.08 ±1.2 mg; manganese 2.01 ± 0.21 mg. (6)
• Ethanol extract of grounded and air-dried leaves and stems yielded pterocarpin and isoflavan derivatives elucidated as 2- hydroxy-3, 9-dimethoxypterocarpin (1), 4-hydroxy-3-methoxy-8,9-methylenedioxypterocarpan (2), medicarpin (3), 7-hydroxy-2',4'-dimethoxy isoflavan (4), 7-hydroxy-4'-methoxyisofalvone (5) 5,7,4'-trihydroxyisoflavone (6), 3,7-dihydroxy-6-methoxylflavone (7), and quercetin (8).   (7)
• Screening of crude leaf extracts yielded tannins, phlobatannins, saponins, flavonoids, alkaloids, cardiac glycosides, and phenolics. (see study below) (11)
• Study of aerial parts yielded a new acyclic guanidine alkaloid, canarosine, together with five known compounds: ß-sitosterol (1), stigmasterol (2), daucosterol (3), epi-inositol 6-O-methyl ether (4), and rutin (5). (see study below) (3)
• Study of fatty acid composition of seed flour (g/100g lipid) yielded: (Saturated fatty acids) palmitic acid 2.18. stearic acid 20.9; (Polyunsaturated fatty acids) palmitoleic acid ND, oleic acid 63, linoleic acid 11.5, linolenic acid ND; and P/S (polyunsaturated/saturated fatty acid) ratio of 3.22. (13)
• Study of Canavalia maritima seed flour for antinutritional components (mg/100 g dw basis) yielded total phenolics 1370±0.04, with +++ phytohemagglutinin activity, and absence of tannins and trypsin inhibitory activity. (13)
• Phytochemical screening of extract of powdered leaves yielded carbohydrates, alkaloids, sterols, flavonoids, saponins, tannins, and phenolic compounds. (see study below) (16)
• Proximate composition of beach bean seed and leaf yielded: % moisture 12.24 and 11.06; % ash content 2.53 and 8.45;% crude fiber 3.84 and 3.99; % fat content 3.57 and 5.31; % crude protein 50.84 and 30.59; % carbohydrate 26.98 and 40.60. (19)
• Phytochemical screening of leaf and seed extracts yielded alkaloids, carbohydrates, cardiac glycosides, fats and oils, flavonoid, saponin, steroids, terpenoids, tannins (only in leaves) and absence of anthraquinone in both. (19)
• Vitamin content in seeds and leaves (mg/100mL) yielded: A 130 and 141; B 252 and 243, C 5 and 7, E 6 and 8. Mineral composition of seeds and leaves (mg/100 g dry matter) yielded: Na 49 and 38, K 981 and 789, Ca 301 and 468, Mg 123 and 98, Fe 58 and 43, Zn 15 and 13, P) 620 and 590. (19)

• Considered aphrodisiac.

• Studies suggest antibacterial, dopamine receptor inhibitory, cytotoxic, anti-biofilm, antiplasmodial, antiviral, smooth muscle relaxant, CNS depressant properties.

Parts used
Leaves, shoots, seeds, roots.

- Seeds are edible and serve as an important source of dietary protein in West Africa and Nigeria.
- Tender pods and seeds may be boiled or roasted.

- When mature, pods and seeds are soaked before being eaten to remove toxins.
- Roasted beans added to coffee.
- Flowers used for making spice.
- Juice from the petioles applied to puncture wounds by thorns or other sharp objects.
- Decoction of leaves used for rheumatism.
- Paste of leaves used for boils and sores.
- In Samoa, plant potion used during labor.
- Shoot decoction used to treat tuberculosis. Roots used for treatment of ciguatera fish poisoning, aches, pains, rheumatism, and leprosy. Leaf extracts used for burns, and as styptic.
- In Tonga, hot water infusion of leaves with other plants used to treat secondary amenorrhea and postpartum hemorrhage.
- Used as aboriginal bush medicine in Australia: root extract rubbed on skin to relieve various aches and pains. (14)
- In Australia, the beans soaked in water and pounded into cakes, used for baldness (Petrie 1904). In Broome, Western Australia, root infusion applied locally for aches and pains, rheumatism, leprosy, and for treating colds. (15)

Fodder: In Africa and Southeast Asia, used as fodder because of high protein content of leaves, flowers, fruits, and seeds. (6)
Entheogen: Dried leaves have been used as entheogen, a component to some ancient rituals. In ancient Peru, the fruit had ritual and magical significance.
• Marijuana substitute: In South America, Africa and Gulf Coast of Mexico, beans of C. maritima are ingested or smoked with the dried leaves for marijuana-like effects. Has an increasing following for its use as a marijuana substitute.
• Tobacco substitute: Used by herbalists as a natural tobacco alternative.

Albumins and globulins are the major storage proteins, constituting 90% of the total proteins in Canavalia seeds. Total phenolics were low, while tannins and trypsin inhibition were absent. As with other legumes, Canavalia seeds possess antinutritional factors such as phenolics and phytohemagglutinins. (2)
Canarosine / Dopamine D1 Receptor Inhibition:
Study yielded a new acyclic alkaloid, canarosine, together with five known compounds. Canarosine, at concentration of 100 µg/ml, showed 91% inhibition of the dopamine D1 receptor binding with IC50 of 39.4±5.8 µM. (see constituents above)
Lectin / Vascular Smooth Muscle Relaxation / Seeds:
Study of a lectin from Cm seeds and its relaxant activity on vascular smooth muscle showed that CM exerts a concentration-dependent relaxant action on isolated aortic rings probably via an interaction with a specific lectin-binding site on the endothelium, resulting in a release of nitric oxide.
ConM Lectin / Alteration of Biofilm Formation in Strep mutans: Study evaluated the effects of ConM and concanavalin A (ConA) on the expression of genes related to virulence and biofilm formation in Streptococcus mutans. S. mutans is the biofilm-forming bacterium primarily associated with dental caries. Results showed ConM significantly reduced the expression of genes encoding enzymes related to adhesion, formation and regulation of biofilms. ConA did not alter the expression of genes studied. (8)
Nutritional Evaluation of Tender Pods:
Study evaluated the nutritional, antinutritional and protein qualities of tender pods of C. maritima. Crude protein was comparable to many edible legumes. Cooking significantly elevated carbohydrates and calorific value of tender pod, while crude fiber was significantly decreased. Minerals did not drain too much on cooking; K, Mg, Zn and Mn in fresh or cooked pods were comparable or higher than the NRC-NAS recommended pattern. While cooking decreased the essential amino acids, threonine, valine, isoleucine, phenylalanine and lysine in cooked pods. levels were equivalent or higher than the FAO-WHO-UNU recommended pattern. Also, pressure cooking improved nutritional qualities by lowering the hemagglutinin activity. (9)
Anticancer / Cytotoxic on Cancer Cell Lines MCF-7 and HT-29:
Methanol extract of cooked (C. maritima) and fermented (C. cathartica) split beans showed better in vitro anticancer activities compared to the raw beans. Results suggest a potential for the extracts of cooked/fermented beans to control colon cancer by diet management. (10)
Antibacterial / Leaves:
Evaluation of various leaf extracts of Canavalia rosea showed high activity against microganisms B. cereus, B. megaterium, B. stearothemophilus, B. subtilis, Staphylococcus aureus, and Streptococcus faecalis. Gram negative bacteria were not as susceptible. (see constituents above) (11)
Canarosine / Antiplasmodial / Anti-Herpes Type 1 / Leaves:
Study of aerial parts isolated six compounds including a new guanidine alkaloids, canarosine, a flavonoid glycoside, rutin, epi-inositol 6-O-methyl ether, β-sitosterol glucoside, and a 2:1 mixture of β-sitosterol and stigmasterol. Canarosine caused 95% inhibition of dopamine-1 receptor binding. The alkaloids was also active against P. falcifarum K1 strain, with moderate activity against Herpes simplex virus type 1. (12)
• Central Nervous System Depressant Effects / Toxicity Study / Leaves:
Study evaluated the CNS activity of an ethanolic extract of C. maritima using behavioral studies such as potentiation of phenobarbitone sleeping time, actophotometer activity test, rotarod test, forced swim test, haloperidol induced catalepsy test in mice and rats. Acute oral toxicity study of ethanolic extract of leaves done per OECD 425 guideline showed an LD50 > 2000 mg/kg. Results showed CNS depressant effects as evidenced by reduction in locomotor activity, significant dose dependent myorelaxant activity, dose-dependent sedative and anxiolytic effect. (16)
Lectins ConA  and ConM / Antifungal Effect / Effect in Combination with Fluconazole / Seeds:
Lectins participate in the defense against microorganisms and in signaling the damage caused by pathogens to the cell surface and/or intracellularly in plants. Study analyzed the antifungal potential of lectins extracted from Canavalia rosea and C. ensiformis against Candida albicans and C. tropicalis. Results of minimum inhibitory concentration showed no antifungal activity against the tested strains. However, lectins modified the action of fluconazole, reducing the IC50 of the drug against C. albicans. Lectins also modulated the morphological transition of the tested strains. (17)

- Wildcrafted.
- Extracts and seeds in the cybermarket.

Updated August 2023 / Sept 2021 / Feb 2019 / May 2017 / Jan 2016
December 2009

Photos © Godofredo Stuart / StuartXchange
OTHER IMAGE SOURCE: File: Beach bean (Canavalia rosea) / Bob Peterson / CC BY-SA 2.0 Generic /  click on the image or link to go to source page / Wikimedia Commons

Additional Sources and Suggested Readings
Nutritional and microbiological features of little known legumes, Canavalia cathartica Thouars
and C. maritima Thouars of the southwest coast of India
/ S. Seena and K. R. Sridhar / Microbiology and Biotechnology, Department of Biosciences, Mangalore University, Mangalagangotri, Mangalore 574 199, India
Coastal sand dune vegetation: a potential source of food, fodder and pharmaceuticals / K R Sridhar and B Bhagya
/ Livestock Research for Rural Development 19 (6) 2007
Canarosine: A new guanidine alkaloid from Canavalia rosea with inhibitory activity on dopamine D1 receptors / Duangpen Pattamadilok et al / / Journal of Asian Natural Products Research, Oct 2008; Volume 10, Issue 10: pp 915-918
/ DOI: 10.1080/10286020802181513
Native crystal structure of a nitric oxide-releasing lectin from the seeds of Canavalia maritima / Carlos Alberto de Almeida Gadelha et al / Journal of Structural Biology • Volume 152, Issue 3, December 2005, Pages 185-194 / doi:10.1016/j.jsb.2005.07.012
Canavalia rosea (Sw.) DC. / Synonyms / KEW: Plants of the World Online
Biological Flora of Coastal Dunes and Wetlands: Canavalia rosea (Sw.) DC / Gabriela Mendoza-Gonza ́lez, M. Luisa Mart ́ınez, and Debora Lithgow / DOI: 10.2112/JCOASTRES-D-13-00106.1
Pterocarpin and Isoflavan Derivatives from Canavalia maritima (Aubl.) Thou. / Xinping Huang∗, Bing Mu, Wenhan Lin and Yan Qiu / Rec. Nat. Prod., 2012; 6(2): pp 166-170
A ConA-like lectin isolated from Canavalia maritima seeds alters the expression of genes related to virulence and biofilm formation in Streptococcus mutans / Theodora Thays Arruda Cavalcante, Victor Alves Carneiro, Cinara Carneiro Neves, Humberlânia de Sousa Duarte, Maria Gleiciane de Queiroz Martins, Francisco Vassiliepe Sousa Arruda, Mayron Alves de Vasconcelos, Hélcio Silva dos Santos, Rodrigo Maranguape da Silva Cunha, Benildo Sousa Cavada, Edson Holanda Teixeira / ABB, Vol.4 No.12, December 2013 / DOI: 10.4236/abb.2013.412143
Nutritional evaluation of tender pods of Canavalia maritima of coastal sand dunes / Bhaskar Bhagya, Kandikere R. Sridhar, Sahadevan Seena, Chiu-Chung Young, Ananthapadmanabha B. Arun / Frontiers of Agriculture in China, December 2010, Volume 4, Issue 4, pp 481-488
CYTOTOXIC EFFECTS OF METHANOL EXTRACT OF RAW, COOKED AND FERMENTED SPLIT BEANS OF CANAVALIA ON CANCER CELL LINES MCF-7 AND HT-29 / Vedavyas Ramakunja Niveditha, Divana Krishna Venkatramana, Kandikere Ramaiah Sridhar* / IIOABJ; Vol. 4: Issue 4; 2013: 20–23
Antibacterial activity and Preliminary phytochemical analysis of leaf extract of Canavalia rosea (Sw.) DC. (Beach Bean) / S. Prabhu, L. Joelri Michael Raj, S. John Britto, S.R. Senthilkumar / Int. J. Res. Pharm. Sci., 2010; 1(3): pp 428-434
Phytochemical study of Canavalia Rosea and Elateriospermum Tapos / Duangpen Pattamadilok / CUIE-Chulalongkorn University Intellectual Repository
BIOCHEMICAL AND BIOLOGICAL EVALUATION OF AN UNCONVENTIONAL LEGUME, Canavalia maritima OF COASTAL SAND DUNES OF INDIA / S. Seena, K.R. Sridhar* and B. Bhagya / Tropical and Subtropical Agroecosystems, 5 (2005): pp 1-14
Bush Medicine: Aboriginal remedies for common ills / Dayman Steptoe, Jessie Passananti / Australian Geographic, May 3, 2012
Canavalia rosea / Cheryll Williams / Medicinal Plants in Australia, Vol 3: Plants, Potions, and Poisons
Central Nervous System Activity of Ethanolic Extract of Canavalia maritima Leaves / Khrishna Chaitanya / Dissertation, 2017
Lectins ConA and ConM extracted from Canavalia ensiformis (L.) DC and Canavalia rosea (Sw.) DC inhibit planktonic Candida albicans and Candida tropicalis / Victor Juno Alencar Fonseca, Ana Lays Braga, Rayy Silva de Almeida, Tais Gusmão da Silva, Josefa Carolaine Pereira da Silva et al / Arch Microbiol, 2022; 204(6) / PMID: 35608680 / DOI: 10.1007/s00203-022-02959-x
Canavalia rosea / National Parks: FLORA & FAUNA WEB
Phytochemical and Nutraceutical Potentials of Beach Bean (Canavalia rosea SW.) DC Grown in Anyigba, Kogi State, Nigeria / K Tijani, Abdullahi Attah Alfa, Abdullah Aminu Sezor / Asian Journal of Medicine and Health / DOI: 10.9734/ajmah/2019/v17i330168
Canavalia / Wikipedia

DOI: It is not uncommon for links on studies/sources to change. Copying and pasting the information on the search window or using the DOI (if available) will often redirect to the new link page. (Citing and Using a (DOI) Digital Object Identifier)

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