Hydrosols of orange blossom <em>(Citrus aurantium</em>), and rose flower (<em>Rosa damascena</em> and <em>Rosa centifolia</em>) support the growth of a heterogeneous spoilage microbiota - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Food Research International Year : 2015

Hydrosols of orange blossom (Citrus aurantium), and rose flower (Rosa damascena and Rosa centifolia) support the growth of a heterogeneous spoilage microbiota

Abstract

Hydrosols are hydrodistillation products of aromatic plants. They contain less than 1 g/L of dispersed essential oils giving organoleptic properties. Hydrosols are subjected to microbial proliferation. Reasons for spoilage have to be found in the nature of substrates supporting growth and ofmicrobiological contaminants. The composition in essential oils and themicrobiota of 22 hydrosol samples of Citrus aurantium L. ssp. amara L. (orange blossom), Rosa damascena Miller (rose D.), and Rosa centifolia L. (rose C.) flowers were analyzed to determine the factors responsible for decay. The median concentrations in essential oils were 677 mg/L for orange blossom hydrosols, 205 mg/L for rose D. hydrosols, and 116 mg/L for rose C. hydrosols. The dry matter content of these hydrosols varied between 4.0 mg/L and 702 mg/L, and the carbohydrate content varied between 0.21 mg/L and 0.38 mg/L. These non-volatile compounds were likely carried over during distillation by a priming and foaming effect, and could be used as nutrients by microorganisms. A microbial proliferation at ambient temperature and also at 5 °C has been observed in all studied hydrosols when stored in a non-sterile container. In contaminated hydrosols,maximal countswere about 7 log10 CFU/mL,while the French pharmacopeia recommends a maximal total bacterial count of 2 log10 CFU/mL. Neither yeast nor mold was detected. The isolated microbial population was composed of environmental Gram-negative bacteria, arranged in four major genera: Pseudomonas sp., Burkholderia cepacia complex, and presumably two new genera belonging to Acetobacteraceae and Rhodospirillaceae. Among those bacteria, Burkholderia vietnamiensis and Novosphingobium capsulatum were able to metabolize volatile compounds, such as geraniol to produce 6-methyl-5-hepten-2-one or geranic acid, or phenylethyl acetate to produce 2-phenylethanol. EO concentrations in hydrosols or cold storage are not sufficient to insure microbiological stability. Additional hurdles such as chemical preservatives or aseptic packaging will be necessary to insure microbial stability.
Fichier principal
Vignette du fichier
2015 - Publi 28 - Ginies-Guinebretière-Renard-Carlin_1.pdf (799.54 Ko) Télécharger le fichier
Origin Files produced by the author(s)
Loading...

Dates and versions

hal-02637368 , version 1 (27-05-2020)

Identifiers

Cite

Cécile Labadie, Christian Ginies, Marie Helene M. H. Guinebretière, Catherine M.G.C. Renard, Céline Cerutti, et al.. Hydrosols of orange blossom (Citrus aurantium), and rose flower (Rosa damascena and Rosa centifolia) support the growth of a heterogeneous spoilage microbiota. Food Research International, 2015, 76, pp.576-586. ⟨10.1016/j.foodres.2015.07.014⟩. ⟨hal-02637368⟩
14 View
397 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More