What are the spectroscopic techniques?
What are the spectroscopic techniques?
Spectroscopic methods can be divided into three main groups: 1. Electronic spectroscopy, including ultraviolet (UV) and visible absorption spectroscopy, fluorescence spectroscopy, circular dichroism (CD) and linear dichroism spectroscopy.
What are the methods of isolation and identification used for flavonoids?
Silica gel chromatography is the main method to isolate or identify flavonoids. It is applied to isolate low or medium polar constituents. Reversed phase silica gel (e.g. reversed phase C18 silica gel) is commonly used to isolate flavonoid glycosides.
How do flavonoids help the body?
What do flavonoids do? Flavonoids help regulate cellular activity and fight off free radicals that cause oxidative stress on your body. In simpler terms, they help your body function more efficiently while protecting it against everyday toxins and stressors. Flavonoids are also powerful antioxidant agents.
How do you extract flavonoids?
Therefore, several techniques for extracting flavonoids to increase the extraction yields of these major bioactive compounds have been implemented. Various techniques have been proposed, including maceration, percolation, hydro-distillation, boiling, reflux, soaking, and soxhlet (Alara et al., 2018a).
How many types of spectroscopic methods are there?
There are many different types of spectroscopy, but the most common types used for chemical analysis include atomic spectroscopy, ultraviolet and visible spectroscopy, infrared spectroscopy, Raman spectroscopy and nuclear magnetic resonance.
How do you test the presence of flavonoids?
Test for flavonoids. To one milliliter of the crude stock extract, a few drops of dilute sodium hydroxide was added. An intense yellow colour appeared in the plant crude extract, which became colourless on the addition of a few drops of dilute acid which indicates the presence of flavonoids.
Why are flavonoids of pharmacological interest to researchers?
The unique and vast pharmacological activities of flavonoids have made them of research interest. This led to the use of various techniques to isolate and characterize them, intending to determine their potential health benefits.
Are there any health benefits to taking flavonoids?
The health benefits reviewed were anti-cancer, anti-microbial, anti-oxidant, anti-inflammatory, anti-fungal, anti-ulcer, and anti-edematogenic activities. The search was done by using keywords such as flavonoids on “science direct,” “google scholar,” “Scopus” database, and many journal sites.
What is the biosynthetic pathway of a flavonoid?
Flavonoids or stilbenes biosynthetic pathway (Fig. 1) follow the extension of 4-hydroxycinnamoyl-CoA with three malonyl-CoA units, in which the poly-β-keto chain folded in different ways, via Aldo or Claisen reactions.
What are the different subclasses of flavonoids?
Variations in this basic structure give the various subclasses of flavonoidal compounds. These are flavanones, isoflavones, flavones, flavanols (catechins), chalcones, flavonols, and anthocyanins [ 11, 12, 13, 14 ].