Soy isoflavones are heterocyclic phenols with structural similarity to estradiol-17beta and selective estrogen receptor modulators. Actions at the cellular level depend on the target tissue, receptor status of the tissue, and the level of endogenous estrogen.
What is isoflavone glycosides?
Isoflavones are found in soybeans as glycosides, which bind to sugar molecules. The fermentation of soybeans or their derivatives allows the isoflavone glycoside to release sugar molecules, resulting in aglycone isoflavone (Fayed 2015).
Is soybeans bad for you?
Even though soy protein may have little direct effect on cholesterol, soy foods are generally good for the heart and blood vessels if they replace less healthful choices, like red meat, and because they deliver plenty of polyunsaturated fat, fiber, vitamins, and minerals, and are low in saturated fat.
Are isoflavones estrogen?
Isoflavones are weak estrogens in that they bind to estrogen receptors, but they also have important nonhormonal properties as well. Initial speculation that soyfoods, and in particular isoflavones, might promote bone health was based on the estrogenic properties of isoflavones.
What foods contain isoflavone?
Soy and its products, and legume seeds (lentils, beans, peas) are the richest sources of isoflavones, including genistein and daidzein [2]. Moreover, small amounts of isoflavones are also contained in other plant products (cereals, potatoes, vegetables, fruits), as well as in milk, meat, and beer [1, 2].
Does soy contain genistein?
The best known sources of genistein are soy-based foods, such as soy cheese or soy drinks (i.e., soy milk and soy-based beverages). The content of genistein in mature soybeans has been shown to range from 5.6 to 276 mg/100 g, and an average content of 81 mg/100 g is often described for comparative purposes (59).
Is genistein soy?
Genistein (4′,5,7-trihydroxyflavone) is a phytoestrogen belonging to the class of soy isoflavones, a sub-class of flavonoids that have received great attention for their potential on human health benefits.
What is the difference between glycoside and aglycone soy beverages?
The glycoside beverage contained 98% of isoflavones as glycosides, whereas the aglycone beverage contained 57% of isoflavones as aglycones due to partial hydrolysis of genistin and glycitin. . . . . Aglycone soy beverage 2 .
What is the function of isoflavone glycoside in soybeans?
Digestion or fermentation of soybeans or soy products results in the release of the sugar molecule from the isoflavone glycoside, leaving an isoflavone aglycone. Soy isoflavone glycosides include genistin, daidzin, and glycitin, while the aglycones are called genistein, daidzein, and glycitein ( Figure 1 ).
What is the difference between aglycones and isoflavones?
Soy isoflavone glycosides include genistin, daidzin, and glycitin, while the aglycones are called genistein, daidzein, and glycitein ( Figure 1 ). Unless otherwise indicated, quantities of isoflavones specified in this article refer to aglycones — not glycosides.
Are aglycone-rich soy products more effective in preventing heart disease?
Isoflavone aglycone-rich products may be more effective than glucoside-rich products in preventing chronic disease such as coronary heart disease. Soybeans, which have long been part of the diet in Asian countries, contain a variety of biologically active compounds ( Messina and Messina 1991 ).
