Profragrances – Riechstoffvorstufen

Niedermolekulare Glukoside als aktivierbare Aromastoffe

“…deren Befeuchtung in Produkten oder mikrobiellen Abbau die Aroma‐ und Duftstoffe nach Bedarf wieder freigesetzt werden ( Flavor‐on‐demand ). In allen Anwendungen sind Aroma‐ und Duftstoffglukoside der Mikroverkapselung [3] zur Speicherung überlegen, da sie keine Fremdstoffe bei der Freisetzung hinterlassen, lediglich sehr geringe Konzentrationen von Glukose.…”

Ein alternativer Sauerstoffnachweis

“… 2‐Oxoacetate (a‐Ketoester) zerfallen bei Lichteinwirkung (ca. 360 nm) in einer Norrish‐Typ‐II‐Reaktion [1] unter Bildung von Aldehyden und Ketonen und einem molaren Äquivalent eines Gases: In Abwesenheit von Sauerstoff ist dies CO, in Gegenwart von Sauerstoff CO 2 . …”

“… Abstract Die kontrollierte und verzögerte Freisetzung von Riechstoffen ist eine wichtige Strategie in der funktionellen Parfümerie [1]. Sie lässt unsere Wäsche länger frisch duften oder auch unsere Haut und Haare.…”

Selective Peptide-Mediated Enhanced Deposition of Polymer Fragrance Delivery Systems on Human Hair

“…The design of fragrance delivery systems that can efficiently deposit from a personal care product onto, e.g., hair or skin to provide a long-lasting perception of the volatiles is a challenging task. First, fragrances are highly volatile compounds that easily evaporate during application. − Second, many fragrances, such as aldehydes, are prone to oxidation under ambient conditions, which can lead to a rapid loss of their activity and may also generate degradation products that can act as contact allergens. , Some of these challenges can be addressed using polymer profragrances or polymer nanoparticles or microcapsules as fragrance delivery systems. − The use of profragrances in which the volatile is attached to a polymer carrier via a pH-, temperature-, or light-sensitive labile bond , or the encapsulation of fragrances in polymer capsules can prevent degradation of the active compound, avoid premature evaporation, and allow controlled release. , …”

“…4,5 Some of these challenges can be addressed using polymer profragrances or polymer nanoparticles or microcapsules as fragrance delivery systems. 6−10 The use of profragrances in which the volatile is attached to a polymer carrier via a pH-, temperature-, or light-sensitive labile bond 7,8 or the encapsulation of fragrances in polymer capsules can prevent degradation of the active compound, avoid premature evaporation, and allow controlled release. 9,10 While much of the work that has been done on polymerbased fragrance delivery systems has addressed issues related to the volatility, stability, and controlled release of fragrances, the deposition of these systems on the surface of interest is another important parameter that determines product performance.…”