Determination of the odor threshold concentrations and partition coefficients of isothiocyanates from Brassica vegetables in aqueous solution was written by Marcinkowska, Monika;Jelen, Henryk H.. And the article was included in LWT–Food Science and Technology in 2020.Category: esters-buliding-blocks The following contents are mentioned in the article:
Isothiocyanates (ITCs) are products of the enzymic breakdown of glucosinolates and may cause pungent flavor notes in vegetables. Limited data on odor threshold concentrations (OTCs) and odor quality descriptors of ITCs exist in literature. These parameters were determined in aqueous samples for 19 isothiocyanates found mainly in Brassica vegetables. Thresholds and odor quality descriptors were ascertained by panelists using flavor profile anal. (FPA). The odor threshold concentrations of ITCs range from 0.005 x 10-3 (octyl ITC) to 0.2 x 10-3 (Et ITC) g/L and ITCs were mainly characterized by sulfur, garlic, and Brassica vegetable-like notes. Correlation coefficients were between 0.946 (octyl ITC) and 0.996 (3-(methylthio)propyl ITC) and proved convincing results of OTCs using FPA. Partition coefficients were determined in water, artificial saliva and human saliva to provide an insight into behavior of ITCs in two-phase liquid/air systems. Partition coefficients (K) for human saliva are significantly different from other matrixes nevertheless the profile of ITCs K values in water and saliva buffer solution were similar. In human saliva the highest K values were observed for octyl, hexyl and cyclohexyl ITCs, and the lowest for cyclopropyl, benzyl, allyl ITCs. Obtained data provide essential and previously unknown sensory properties for future flavor studies. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Category: esters-buliding-blocks).
Isopropylisothiocyanate (cas: 2253-73-8) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics