Zur Autoxydation des (+)‐Limonens

Schenck, Günther O.; Neumüller, Otto‐Albrecht; Ohloff, G.; Schroeter, Siegfried H.

doi:10.1002/jlac.19656870105

Cited by 49 publications

(15 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reaction with oxygen leads to the formation of hydroperoxides via free radical chain reaction contributing to an augmentation of the POV, while another dehydrogenation gives rise to p-cymene and related compounds ( Fig. 3) (Karlberg et al, 1994;McGraw, Hemingway, Ingram, Canady, & McGraw, 1999;Schenck, Neumüller, Ohloff, & Schroeter, 1965). At the same time, the impact of light on rosemary oil caused an increase in earlier eluting polar compounds amongst them camphor (3 Fig.…”

Section: Resultsmentioning

confidence: 93%

Impact of different storage conditions on the quality of selected essential oils

Turek

Stintzing

2012

Food Research International

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 93%

Impact of different storage conditions on the quality of selected essential oils

Turek

Stintzing

2012

Food Research International

View full text Add to dashboard Cite

“…As a rule, primary autoxidation products such as hydroperoxides eventually break down during advanced stages of oxidation depending on their individual stability. Thereby they give rise to a range of stable oxidized secondary products such as mono‐ to polyvalent alcohols, aldehydes, ketones, epoxides, peroxides, or acids as well as highly viscous, often oxygen‐bearing polymers (Figure B) (Blumann and Ryder ; Pirilä and Siltanen ; Bernhard and Marr ; Treibs ; Schenck and others ; Dieckmann and Palamand ; Karlberg and others ; Shahidi ; Sköld and others ; Bäcktorp and others ). Accordingly, initially formed oxidation products from terpenoids, assigned as hydroperoxides, were reported to decompose in the presence of light, heat, or upon increasing acidity (Hellerström and others ; Blakeway and others ; Hagvall and others ).…”

Section: Alterations Of Essential Oils and Possible Consequencesmentioning

confidence: 99%

Stability of Essential Oils: A Review

Turek

Stintzing

2013

Comp Rev Food Sci Food Safe

937

565

View full text Add to dashboard Cite

In recent years, consumers have developed an ever-increasing interest in natural products as alternatives for artificial additives or pharmacologically relevant agents. Among them, essential oils have gained great popularity in the food, cosmetic, as well as the pharmaceutical industries. Constituting an array of many lipophilic and highly volatile components derived from a great range of different chemical classes, essential oils are known to be susceptible to conversion and degradation reactions. Oxidative and polymerization processes may result in a loss of quality and pharmacological properties. Despite their relevance for consumers, there is a paucity of information available addressing this issue. Therefore, the present review provides a comprehensive summary on possible changes in essential oils and factors affecting their stability. Focusing on individual essential oils, the various paths of degradation upon exposure to extrinsic parameters are outlined. Especially temperature, light, and oxygen availability are recognized to have a crucial impact on essential oil integrity. Finally, analytical methods to assess both genuine as well as altered essential oil profiles are evaluated with respect to their suitability to track chemical alterations. It is believed that only a careful inspection of essential oils by a set of convenient methods allows profound quality assessment that is relevant to producers and consumers alike.

show abstract

“…2 Hydroperoxides stored in non-stabilized white petrolatum. 3 Handled during patch testing and stored in refrigerator between the testings. 4 Hydroperoxides stored in white petrolatum stabilised with 10 ppm of a-tocopheryl acetate.…”

Section: Analysis Of the D-limonene Hydroperoxides In Patch Test Prepmentioning

confidence: 99%

Are contact allergens stable in patch test preparations? Investigation of the degradation of d‐limonene hydroperoxides in petrolatum

et al. 1999

View full text Add to dashboard Cite

Several of the products formed after oxidation of d-limonene exhibit strong contact allergenic properties. Some, e.g., the hydroperoxides, are unstable compounds. In this study, we have examined whether the limonene hydroperoxides are chemically stable in white petrolatum used for patch testing. We found that the stability of the hydroperoxides was strongly dependent on whether or not the petrolatum was stabilized with alpha-tocopheryl acetate. In the presence of this antioxidant, the hydroperoxides were degraded to a greater extent. The hydroperoxides were shown to be directly reduced to the corresponding alcohols by this agent. On the other hand, the compounds where shown to be stable in non-stabilized petrolatum throughout clinical patch testing for a period of 6 weeks, provided that the preparations were stored in a refrigerator when not used. Thus, it is recommended that vehicles without alpha-tocopheryl acetate are used when peroxy or hydroperoxy compounds are patch tested or used in sensitization experiments. However, it is important to limit the storage time so that optimal conditions are at hand. A fast method was developed to enable isolation and quantification of the hydroperoxides in white petrolatum. This analytical method may also be applicable to other compositions of patch test preparations.

show abstract

Zur Autoxydation des (+)‐Limonens

Cited by 49 publications

References 34 publications

Impact of different storage conditions on the quality of selected essential oils

Impact of different storage conditions on the quality of selected essential oils

Stability of Essential Oils: A Review

Are contact allergens stable in patch test preparations? Investigation of the degradation of d‐limonene hydroperoxides in petrolatum

Contact Info

Product

Resources

About