Topic
Vanillin
About: Vanillin is a research topic. Over the lifetime, 2522 publications have been published within this topic receiving 57926 citations. The topic is also known as: vanilla & p-hydroxy-m-methoxybenzaldehyde.
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TL;DR: It was shown that the use of catechin equivalents overestimates tannin content, and revised procedures for the vanillin assay are given which give good reproducibility.
Abstract: Several parameters of the vanillin assay, for studying sorghum tannin, were examined to determine which must be most closely controlled to ensure accuracy and reproducibility. A 20-min extraction in methanol was found to be adequate. When corrected for background colour, the modified vanillin assay was found to give nearly identical values with those obtained with the regular vanillin assay, except with group II sorghum. The reactions of tannin and catechin with vanillin were found to differ markedly in reaction kinetics. It was shown that the use of catechin equivalents overestimates tannin content. The assay was found to be very temp. dependent. Revised procedures for the vanillin assay are given which give good reproducibility
1,572 citations
TL;DR: It was shown that decomposition was pH-dependent and occurred faster at neutral-basic conditions and vanillin, ferulic acid, feruloyl methane were identified as minor degradation products and the amount of vanillin increased with incubation time.
1,452 citations
TL;DR: In this article, several parameters mostly affecting the precision and accuracy of vanillin assay were reexamined and optimized, including acid nature and concentration, reaction time, temperature, and vanillin concentration.
Abstract: Several parameters mostly affecting the precision and accuracy of vanillin assay were reexamined and optimized. The reexamination was performed both by vanillin reaction with catechins and by vanillin reaction with purified proanthocyanidins. In addition to the acid nature and concentration, the reaction time, the temperature, and the vanillin concentration, other factors such as the water content, the presence of interfering substances, and the standard utilized, for both vanillin reaction with catechins and vanillin reaction with proanthocyanidins, were also important. However, the kinetics of the two types of reactions were markedly different. For estimating accurately catechins or proanthocyanidins that exist simultaneously in plant tissues, it is necessary to preliminarily separate them from each other. Keywords: Catechins; proanthocyanidins; vanillin assay
876 citations
TL;DR: Ferulic acid is a phenolic acid of low toxicity; it can be absorbed and easily metabolized in the human body and is used as the raw material for the production of vanillin and preservatives, as a cross-linking agent for the preparation of food gels and edible films, and as an ingredient in sports foods and skin protection agents.
Abstract: Ferulic acid (4-hydroxy-3-methoxycinnamic acid), an effective component of Chinese medicine herbs such as Angelica sinensis, Cimicifuga heracleifolia and Lignsticum chuangxiong, is a ubiquitous phenolic acid in the plant kingdom. It is mainly conjugated with mono- and oligosaccharides, polyamines, lipids and polysaccharides and seldom occurs in a free state in plants. Ferulic acid is a phenolic acid of low toxicity; it can be absorbed and easily metabolized in the human body. Ferulic acid has been reported to have many physiological functions, including antioxidant, antimicrobial, anti-inflammatory, anti-thrombosis, and anti-cancer activities. It also protects against coronary disease, lowers cholesterol and increases sperm viability. Because of these properties and its low toxicity, ferulic acid is now widely used in the food and cosmetic industries. It is used as the raw material for the production of vanillin and preservatives, as a cross-linking agent for the preparation of food gels and edible films, and as an ingredient in sports foods and skin protection agents. Ferulic acid can be prepared by chemical synthesis and through biological transformation. As polysaccharide ferulate is a natural and abundant source of ferulic acid, preparation of ferulic acid from plant cell wall materials will be a prospective pathway.
714 citations
TL;DR: The use of vanillin as a building block for the chemical industry is discussed in this article, where vanillin is one of the only molecular phenolic compounds manufactured on an industrial scale from biomass and has the potential to become a key intermediate for the synthesis of bio-based polymers, for which aromatic monomers are needed to reach good thermo-mechanical properties.
Abstract: The use of vanillin as a building block for the chemical industry is discussed in this article. Vanillin is currently one of the only molecular phenolic compounds manufactured on an industrial scale from biomass. It has thus the potential to become a key-intermediate for the synthesis of bio-based polymers, for which aromatic monomers are needed to reach good thermo-mechanical properties. After a first part dedicated to the current sourcing of vanillin, this article focuses on the alkaline oxidation lignin-to-vanillin process, reporting advantages and limits, discusses the various postdepolymerization methods for product isolation and finally examines the outlook for the wider use of vanillin as a key building block for the chemical industry.
562 citations