Daidzein
[CAS# 486-66-8]

Identification

• Classification: Biochemical >> Natural biochemical product
• Name: Daidzein
• Synonyms: 4',7-Dihydroxyisoflavone; 7-Hydroxy-3-(4-hydroxy-phenyl)-chromone; 7-Hydroxy-3-(4-hydroxy-phenyl)-4H-1-benzo-pyran-4-one
• Molecular Formula: C₁₅H₁₀O₄
• Molecular Weight: 254.24
• CAS Registry Number: 486-66-8
• EC Number: 207-635-4
• SMILES: C1=CC(=CC=C1C2=COC3=C(C2=O)C=CC(=C3)O)O

Properties

• Water solubility: insoluble (Expl.)
• Density: 1.4±0.1 g/cm³, Calc.^*
• Melting point: 328-332 °C (Expl.)
• Index of Refraction: 1.699, Calc.^*
• Boiling Point: 512.8±50.0 °C (760 mmHg), Calc.^*
• Flash Point: 201.2±23.6 °C, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software.

Safety Data

• Hazard Symbols: GHS07 Warning
• Risk Statements: H315-H319
• Safety Statements: P264-P264+P265-P280-P302+P352-P305+P351+P338-P321-P332+P317-P337+P317-P362+P364

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Eye irritation	Eye Irrit.	2	H319
Skin irritation	Skin Irrit.	2	H315
Acute toxicity	Acute Tox.	4	H312
Acute toxicity	Acute Tox.	4	H302
Specific target organ toxicity - single exposure	STOT SE	3	H335
Acute toxicity	Acute Tox.	4	H332

Discovery and Applications

Daidzein is a naturally occurring isoflavonoid found primarily in soybeans and other leguminous plants. It belongs to a class of compounds known as phytoestrogens, which are plant-derived substances that have estrogen-like effects in the body. Daidzein was first isolated in the early 20th century, with its structure and biological activity being studied extensively over the following decades. As one of the key bioactive compounds in soy, daidzein has become a subject of significant interest due to its potential health benefits, particularly in relation to hormonal balance, cardiovascular health, and cancer prevention.

Daidzein is a member of the class of compounds called isoflavones, which also includes genistein, another major bioactive compound in soy. Both daidzein and genistein share a similar chemical structure, and they exhibit estrogenic activity, meaning they can bind to estrogen receptors in the body and mimic the effects of the hormone estrogen. This ability to mimic estrogen has led to considerable research into the potential benefits of daidzein, particularly for conditions related to hormonal imbalances such as menopause.

One of the most well-known applications of daidzein is in the area of women's health. During menopause, women experience a natural decline in estrogen levels, which can lead to a variety of symptoms, including hot flashes, mood swings, and osteoporosis. As a phytoestrogen, daidzein has been investigated for its potential to alleviate these symptoms by exerting mild estrogenic effects in the body. Research has shown that daidzein, when consumed as part of soy products or as a dietary supplement, can help reduce the frequency and severity of hot flashes, making it a popular alternative to traditional hormone replacement therapy (HRT).

In addition to its estrogenic effects, daidzein has been studied for its cardiovascular benefits. Isoflavones like daidzein are known to possess antioxidant properties, which help protect the body from oxidative stress and reduce the risk of heart disease. Studies have suggested that daidzein can help lower cholesterol levels, improve blood vessel function, and reduce the risk of developing atherosclerosis (the buildup of plaque in the arteries). These effects are thought to be mediated by daidzein’s ability to reduce oxidative damage and inflammation, both of which play key roles in the development of cardiovascular disease.

Daidzein’s anticancer potential is another area of active research. Several studies have demonstrated that daidzein can exert anticancer effects in various types of cancer, including breast, prostate, and colon cancers. The compound has been shown to inhibit the growth of cancer cells, induce apoptosis (programmed cell death), and prevent the spread of tumors. In particular, its effects on estrogen receptors make it a topic of interest in the context of hormone-related cancers, such as estrogen receptor-positive breast cancer. By binding to these receptors, daidzein may block the actions of endogenous estrogens that could stimulate the growth of hormone-sensitive tumors.

Furthermore, daidzein has been found to possess anti-inflammatory properties, which contribute to its potential use in managing conditions such as arthritis. Chronic inflammation is a hallmark of many autoimmune diseases, and daidzein’s ability to modulate inflammatory pathways may help reduce symptoms and improve overall quality of life for individuals with these conditions.

Aside from its applications in human health, daidzein also has uses in agriculture. As a natural compound found in soybeans, daidzein plays a role in the plant's defense mechanisms against pests and pathogens. Its presence in soy plants helps protect the plant from insect herbivory, making it a naturally occurring pesticide. Additionally, daidzein is sometimes incorporated into functional food products due to its health-promoting properties. Foods like soy milk, tofu, and tempeh are rich in daidzein and are commonly consumed in various cultures for their perceived health benefits.

Although the therapeutic potential of daidzein is promising, there are some challenges that need to be addressed before it can be widely used in clinical settings. One of the main challenges is its bioavailability, as daidzein is not easily absorbed in the body. To overcome this, researchers are exploring different delivery systems, such as nanoparticles or combining daidzein with other compounds to enhance its absorption and effectiveness.

In conclusion, daidzein is a bioactive isoflavonoid found in soybeans and other legumes, with a wide range of potential health benefits. Its estrogen-like effects make it particularly useful in the management of menopausal symptoms, while its antioxidant, anti-inflammatory, and anticancer properties make it a valuable compound for improving cardiovascular health and potentially preventing cancer. As research continues into its bioavailability and clinical efficacy, daidzein may become an important part of therapeutic approaches for hormonal health, cancer prevention, and cardiovascular disease.

References

2007. A functional genomics approach to (iso)flavonoid glycosylation in the model legume Medicago truncatula. Plant Molecular Biology, 64(5).
DOI: 17437063

2005. Flavonoids: from cell cycle regulation to biotechnology. Biotechnology Letters, 27(6).
DOI: 15834800

2003. Comparison of hormonal activity (estrogen, androgen and progestin) of standardized plant extracts for large scale use in hormone replacement therapy. The Journal of Steroid Biochemistry and Molecular Biology, 84(2-3).
DOI: 12711012