Ferulic acid

Scheme 1 – Characterization of Ferulic Acid

The ¹H, ¹³C, and 2D ¹H, ¹H-COSY, ¹³C-¹H HSQC, and HMBC NMR spectra were obtained using a JEOL-LA 400 FT-NMR spectrometer with tetramethylsilane (TMS) as an internal standard. The production of the sample solutions involves the use of deuterated solvents with residual carbon and proton shifts, such as DMSO—d6, based on the solubility of the chemicals. 10 mg of each sample were dissolved in 500–600 μl of an appropriate solvent and then filled to a depth of about 4 cm in a standard 5 × 178 mm NMR tube. ChemBioDraw Ultra, Version 14 (PerkinElmer, Yokohama, Japan) was used to show the compounds' structures, while MestReNova software 8.1.2 (Mestrelab Research, A Coruña, Spain) was utilized to handle the NMR spectroscopic data. (see image below)

Characterization of Structure of Ferulic Acid. (Alanazi S., et al. 2021)

Scheme 2 – HPLC system for Determination of Ferulic Acid

The HPLC system utilized for the method development was a Varian Pro-star SYS-LC-240-E (Walnut Creek, CA, USA). Column oven compartment (ProStar 410), on-line degasser (ProStar 230), ternary pump (ProStar 230), solvent delivery module (ProStar 230), autosampler (ProStar 410), and photodiode array detector (DAD) (ProStar 335) were the components of the HPLC system. Software for Varian Star Workstation chromatography (Walnut Creek, CA, USA) was used for data collection, processing, and reporting. An analytical column from Varian (Walnut Creek, CA, USA) measuring 5 μm in particle size, 4.6 mm in internal diameter, and 250 mm in length at 25 ± 2°C was used for the experiments, which were conducted in the previously mentioned HPLC system.

At an isocratic flow rate of 1.0 mL/min, the mobile phase was composed of methanol and water that had been adjusted to pH 3.0 using orthophosphoric acid 0.1 N (48:52 v/v). The injection volume of the sample was 10μL. Monitored at 320 nm was FA. Every experiment was conducted in triplicate, and the technique ran for eight minutes. (see images below) (Nadal J M., et al., 2015)

Representative HPLC chromatogram of ferulic acid standard. (Nadal J M., et al., 2015)

Mean calibration curve obtained for FA using working standard solutions at the concentration range of 10.0 to 70.0 μg/mL. (Nadal J M., et al., 2015)

Case Study 1

Ferulic acid (FA) is produced in plants via the shikimate pathway, which begins with aromatic amino acids, L-phenylalanine and L-tyrosine, as essential components. Initially, phenylalanine and tyrosine are transformed into cinnamic and p-coumaric acid by phenylalanine ammonia lyase and tyrosine ammonia lyase, respectively. The hydroxylation and methylation process converts p-coumaric acid to FA. The oxidation and methylation of FA and other aromatic compounds produce di- and tri-hydroxy derivatives of cinnamic acid, which, along with FA, contributes to lignin production (see image below). A range of metabolites, including ferulic acid-sulfate, ferulic acid-glucuronide, ferulic acid-sulfoglucuronide (which are major metabolites in rat plasma and urine), ferulic acid-diglucuronide, feruloylglycine, m-hydroxyphenylpropionic acid, dihydroferulic acid, vanillic acid, and vanilloylglycine, are believed to be produced by in vivo studies on FA metabolism. (Kumar N., et al., 2014)

Schematic depiction of synthesis of ferulic acid. (Kumar N., et al., 2014)

Case Study 2

Following intake, intestinal transit occurs for both 5-O-feruloyl-l-arabinofuranose and ferulic acid (FA), which are not broken down by the stomach acid environment. In the colon, microbial cinnamoyl esterase, xylanase, and FA esterase liberate bound FA from parent compounds. Most of the FA is then absorbed passively (about 90%), with a little amount being taken actively via the monocarboxylic acid transporter. Many studies have been conducted on the course of FA after absorption, as well as the key pharmacokinetic characteristics in both rats and humans. After oral consumption, FA is rapidly absorbed and reaches its maximal plasma concentration (C_max) in 30 minutes (T_max). In rats and humans, the administration of free FA results in a significant reduction in C_max and an increase in T_max and half-life when FA is complexed with mono- or di-saccharides (see image below). (Mancuso C., et al., 2014)

The main pharmacokinetic parameters of ferulic acid. (Mancuso C., et al., 2014)

Ferulic acid is a naturally occurring phenolic chemical found largely in plant cell walls such as rice, wheat, and oats, as well as apple and orange seeds. It is important in the plant world because it increases cell wall stiffness and protects against microbial damage and ultraviolet (UV) radiation. Ferulic acid has received substantial interest in the disciplines of nutrition, medicine, and cosmetics due to its powerful antioxidant, anti-inflammatory, and anti-carcinogenic characteristics.

1. In terms of human health and wellbeing, ferulic acid's strong antioxidant potential stands out, allowing it to scavenge free radicals and so protect cells from oxidative damage. This oxidative stress is linked to the development of many chronic illnesses, including cancer, cardiovascular disease, and neurological disorders like Alzheimer's. Ferulic acid, by neutralizing free radicals, can help prevent certain illnesses while also improving cellular health and lifespan.
2. Ferulic acid's anti-inflammatory characteristics make it an effective molecule for treating inflammation-related disorders. Its capacity to affect critical inflammatory pathways and cytokines can help to reduce inflammation, which is important not only in avoiding chronic illnesses but also in expediting wound healing and relieving skin irritation.
3. Ferulic acid is widely recognized for its skin-protective properties, notably its ability to stabilize and enhance the photoprotective effects of vitamins C and E in sunscreen compositions. This combination not only strengthens the skin's defenses against damaging UV radiation, but it also helps to prevent photoaging, resulting in young, beautiful skin. Furthermore, ferulic acid's ability to prevent melanogenesis makes it a useful element in therapies designed to reduce hyperpigmentation and balance out skin tone.

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