About Turmeric and Zedoary

Turmeric is an herbacious perennial in the ginger family, Zingiberaceae.
It maintains and underground stem (rhizome) that continues to grow from year to year, while aboveground its leaves only last for one season; emerging in spring and dying-back in early winter.

The most well-known type of turmeric today is a species formally known as Curcuma longa. It has an orange color and is a cornerstone of Indian cuisine. C. longas popularity has surged in recent years, with its potential health benfits being touted by everyone from farmers to clinicians.

But the Curcuma genus hosts many species, all of which can be called types of turmeric.
To date, nearly 100 different species of turmeric have been discovered, primarily in tropical Asia.
Within this group there is a huge amount of diversity. As close relatives, the plants have much in common, but each has its own unique composition.
More than 400 chemical compounds have been identified and isolated from the various Curcuma species.

Curcumas have traditions of use over a vast area, across national and cultural boundries.
Their use is common in Traditional Chinese Medicine, Ayurveda, Jamu and Islamic Traditional Medicine.
They are credited with a great variety of actions, including wound healing, anti-arthritic, anti-tumor, liver protective activities and much more (1).

Contemporary research into the efficacy of curcuma species is far more common in Asia than in the West. Results of preliminary studies have shown incredible potential for the medical application of curcumas in the modern world.

We hope that researchers around the world will be enabled to challenge and potentially reproduce these results.

Turmeric (Curcuma longa)、Wild Turmeric (C. aromatica)、Zedoary (C. zedoaria)are commonly grown in southern Japan.
More recently, C. zanthorhizza and C. caesia have also been introduced.

Turmeric has the Latin name Curcuma longa. In Japan it is known as aki-ukon,  

Wild Turmeric has the Latin name Curcuma aromatica. In Japanese it is called haru-ukon,

Zedoary has the Latin name Curcuma zedoaria. It is also know as white turmeric. In Japan it is called gajutsu.

Turmeric is the mildest of the curcuma genus. Zedoary is more pungent and Wild Turmeric is the most intense.
Turmeric is the best known, used in cuisine wordwide for its vivid color and flavor.

Zedoary is a perrenial herb in the Ginger family (Zingiberaceae).
Its Latin name is Curcuma zedoaria Roscoe.
It has high concentrations of the volatile oils cineole, camphor and azulene etc.
Also present in smaller amounts are a wide array of other compounds.

Zedoary has rich traditions of use as a medicine thruout Asia.
Merriam Webster Dictionary highlights zedoary's medicinal role as an intestinal stimulant and carminative.

“Various parts of this plant are used in Ayurveda and other folk medicines for the treatment of different ailments such as diarrhoea, cancer, flatulence and dyspepsia” (2)

Zedoary's potential is not limited to food and medicine. It is also being tested for use in green packaging, mixed with chitosan! (3)

It is commonly held that Curcuma zedoaria evolved in the Indian Himalaya.
It is easily cultivaed in tropical and subtropical envirmonments.

Some sources claim that zedoary was introduced to Japan in the 18th century, but there is also evidence that the plant was known locally before that time.

Japanese research has found significant genetic differences beween the zedoary in Yakushima and that grown in China and Taiwan.
This has encouraged the theory that zedoary has been growing in Yakushima and adapting to the local climate since ancient times.

Sources
1
Ayati Z, Ramezani M, Amiri MS, Moghadam AT, Rahimi H, Abdollahzade A, Sahebkar A, Emami SA. Ethnobotany, Phytochemistry and Traditional Uses of Curcuma spp. and Pharmacological Profile of Two Important Species (C. longa and C. zedoaria): A Review. Curr Pharm Des. 2019;25(8):871-935. doi: 10.2174/1381612825666190402163940. PMID: 30947655.

2
Lobo R, Prabhu KS, Shirwaikar A, Shirwaikar A. Curcuma zedoaria Rosc. (white turmeric): a review of its chemical, pharmacological and ethnomedicinal properties. J Pharm Pharmacol. 2009 Jan;61(1):13-21. doi: 10.1211/jpp/61.01.0003. PMID: 19126292.

3
Hiremani VD, Khanapure S, Gasti T, Goudar N, Vootla SK, Masti SP, Malabadi RB, Mudigoudra BS, Chougale RB. Preparation and physicochemical assessment of bioactive films based on chitosan and starchy powder of white turmeric rhizomes (Curcuma Zedoaria) for green packaging applications. Int J Biol Macromol. 2021 Dec 15;193(Pt B):2192-2201. doi: 10.1016/j.ijbiomac.2021.11.050. Epub 2021 Nov 13. PMID: 34785196.

Further Reading

Tariq S, Imran M, Mushtaq Z, Asghar N. Phytopreventive antihypercholesterolmic and antilipidemic perspectives of zedoary (Curcuma Zedoaria Roscoe.) herbal tea. Lipids Health Dis. 2016 Feb 27;15:39. doi: 10.1186/s12944-016-0210-y. PMID: 26920896; PMCID: PMC4769493.
(A clinical trial that has indictaed potential for zedoary to treat high cholesterol and triclyceride counts)

We see great potential in the studies listed below and hope that further research will be pursued:

Hamdi OA, Anouar el H, Shilpi JA, Trabolsy ZB, Zain SB, Zakaria NS, Zulkefeli M, Weber JF, Malek SN, Rahman SN, Awang K. A Quantum Chemical and Statistical Study of Cytotoxic Activity of Compounds Isolated from Curcuma zedoaria. Int J Mol Sci. 2015 Apr 27;16(5):9450-68. doi: 10.3390/ijms16059450. PMID: 25923077; PMCID: PMC4463598.

Jung EB, Trinh TA, Lee TK, Yamabe N, Kang KS, Song JH, Choi S, Lee S, Jang TS, Kim KH, Hwang GS. Curcuzedoalide contributes to the cytotoxicity of Curcuma zedoaria rhizomes against human gastric cancer AGS cells through induction of apoptosis. J Ethnopharmacol. 2018 Mar 1;213:48-55. doi: 10.1016/j.jep.2017.10.025. Epub 2017 Nov 2. PMID: 29102767.

Lee TK, Lee D, Lee SR, Ko YJ, Sung Kang K, Chung SJ, Kim KH. Sesquiterpenes from Curcuma zedoaria rhizomes and their cytotoxicity against human gastric cancer AGS cells. Bioorg Chem. 2019 Jun;87:117-122. doi: 10.1016/j.bioorg.2019.03.015. Epub 2019 Mar 9. PMID: 30884305.