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Menard O, Lesmes U, Shani-Levi CS, Araiza Calahorra A, Lavoisier A, Morzel M, Rieder A, Feron G, Nebbia S, Mashiah L, Andres A, Bornhorst G, Carrière F, Egger L, Gwala S, Heredia A, Kirkhus B, Macierzanka A, Portman R, Recio I, Santé-Lhoutellier V, Tournier C, Sarkar A, Brodkorb A, Mackie A, Dupont D. Static in vitro digestion model adapted to the general older adult population: an INFOGEST international consensus. Food Funct 2023; 14:4569-4582. [PMID: 37099034 DOI: 10.1039/d3fo00535f] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
Understanding the mechanisms of food digestion is of paramount importance to determine the effect foods have on human health. Significant knowledge on the fate of food during digestion has been generated in healthy adults due to the development of physiologically-relevant in vitro digestion models. However, it appears that the performance of the oro-gastrointestinal tract is affected by ageing and that a model simulating the digestive conditions found in a younger adult (<65 years) is not relevant for an older adult (>65 years). The objectives of the present paper were: (1) to conduct an exhaustive literature search to find data on the physiological parameters of the older adult oro-gastrointestinal tract, (2) to define the parameters of an in vitro digestion model adapted to the older adult. International experts have discussed all the parameters during a dedicated workshop organized within the INFOGEST network. Data on food bolus properties collected in the older adult were gathered, including food particle size found in older adult boluses. In the stomach and small intestine, data suggest that significant physiological changes are observed between younger and older adults. In the latter, the rate of gastric emptying is slowed down, the pH of the stomach content is higher, the amount of secretions and thus the hydrolytic activities of gastric and intestinal digestive enzymes are reduced and the concentration of bile salts lower. The consensus in vitro digestion model of the older adult proposed here will allow significant progress to be made in understanding the fate of food in this specific population, facilitating the development of foods adapted to their nutritional needs. Nevertheless, better foundational data when available and further refinement of the parameters will be needed to implement the proposed model in the future.
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Affiliation(s)
- O Menard
- INRAE - Institut Agro, STLO, Rennes, France.
| | - U Lesmes
- Technion Israel Institute of Technology, Israel
| | | | | | - A Lavoisier
- INRAE - Institut Agro, STLO, Rennes, France.
| | - M Morzel
- INRAE - Institut Agro, STLO, Rennes, France.
| | - A Rieder
- Nofima AS - Norwegian Institute of Food, Fisheries and Aquaculture, PB 210, N-1433 Ås, Norway
| | - G Feron
- Centre des Sciences du Goût et de l'Alimentation, CNRS, INRAE, Institut Agro, Université de Bourgogne Franche-Comté, F-21000 Dijon, France
- INRAE, PROBE research infrastructure, ChemoSens facility, F-21000 Dijon, France
| | - S Nebbia
- INRAE - Institut Agro, STLO, Rennes, France.
| | - L Mashiah
- Technion Israel Institute of Technology, Israel
| | - A Andres
- Institute of Food Engineering for Development, Universitat Politecnica de Valencia, Valencia, Spain
| | - G Bornhorst
- Department of Biological and Agricultural Engineering, University of California Davis, Davis, USA
| | - F Carrière
- Aix Marseille University, CNRS, UMR7281 Bioenergetics and Protein Engineering, Marseille, France
| | - L Egger
- Agroscope, Schwarzenburgstr, 161, 3003 Bern, Switzerland
| | - S Gwala
- Teagasc Food Research Centre, Fermoy, Co. Cork, Moorepark, Ireland
| | - A Heredia
- Institute of Food Engineering for Development, Universitat Politecnica de Valencia, Valencia, Spain
| | - B Kirkhus
- Nofima AS - Norwegian Institute of Food, Fisheries and Aquaculture, PB 210, N-1433 Ås, Norway
| | - A Macierzanka
- Gdansk University of Technology, Faculty of Chemistry, Department of Colloid and Lipid Science, 80-322 Gdansk, Poland
| | - R Portman
- Agroscope, Schwarzenburgstr, 161, 3003 Bern, Switzerland
| | - I Recio
- Instituto de Investigación en Ciencias de la Alimentación, CIAL (CSIC-UAM, CEI UAM+CSIC), Nicolás Cabrera, 9, 28049 Madrid, Spain
| | - V Santé-Lhoutellier
- INRAE, France, QuaPA, UR370, Centre de Clermont Auvergne Rhône Alpes, F-63122 Saint Genes Champanelle, France
| | - C Tournier
- Centre des Sciences du Goût et de l'Alimentation, CNRS, INRAE, Institut Agro, Université de Bourgogne Franche-Comté, F-21000 Dijon, France
- INRAE, PROBE research infrastructure, ChemoSens facility, F-21000 Dijon, France
| | - A Sarkar
- Univ Leeds, Sch Food Sci & Nutr, Leeds LS2 9JT, W Yorkshire, UK
| | - A Brodkorb
- Teagasc Food Research Centre, Fermoy, Co. Cork, Moorepark, Ireland
| | - A Mackie
- Univ Leeds, Sch Food Sci & Nutr, Leeds LS2 9JT, W Yorkshire, UK
| | - D Dupont
- INRAE - Institut Agro, STLO, Rennes, France.
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Fricaudet M, Di-Filippo M, Moulin P, Poinsot P, Sage C, Brignot H, Feron G, Charrière S, Peretti N. Performance assessment of salivary screening in familial hypercholesterolemia in children. Atherosclerosis 2021. [DOI: 10.1016/j.atherosclerosis.2021.06.558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lorieau L, Floury J, Septier C, Laguerre A, Le Roux L, Hazart E, Ligneul A, Dupont D, Vigneau E, Hanafi M, Feron G, Labouré H. Relationship among oral health status, bolus formation and food comfortability during consumption of model cheeses in elderly. Food Funct 2021; 12:7379-7389. [PMID: 34184693 DOI: 10.1039/d1fo00767j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The aim of this study was to investigate the impact of oral impairment on chewing behaviour, food bolus properties and food comfortability during elderly consumption of model cheeses. Seventy-two elderly persons (aged 66 to 88) was recruited and classified into two groups according to dental status (poor vs. satisfactory). They showed a wide range of salivary flow rates whatever their dental status (stimulated: 0.2-3.8 mL min-1, resting: 0.1-0.8 mL min-1). Standardized bites of four model cheeses with an identical composition but different textures (soft, hard, processed and whipped) were tested. The time and number of chewing cycles required to form a bolus were measured. The rheological properties of the bolus were studied, as was saliva moistening. Food comfortability was assessed by means of a questionnaire composed of 5 sections (1-oral comfort, 2-bolus formation, 3-pain, 4-texture and 5-flavour perception). The chewing parameters measured were not modified by the oral health. However, elderly with poor dentition formed harder boluses than elderly with satisfactory dentition. Moreover, for elderly with poor dentition, the quantity of saliva incorporated into the bolus was correlated with the stimulated salivary flow rate, which was not the case for elderly with satisfactory dentition. General oral comfort and its different attributes were poorly associated with the oral health of the elderly. A multifactorial analysis performed on an average cheese showed that food comfortability is independent of changes in the hardness and moistening of the bolus, regardless of dental status. In particular, poor dental status increases the hardness of the bolus without modifying its comfortability.
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Affiliation(s)
- L Lorieau
- STLO, INRAE, Institut Agro, 35042, Rennes, France
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Assad-Bustillos M, Tournier C, Palier J, Septier C, Feron G, Della Valle G. Oral processing and comfort perception of soft cereal foods fortified with pulse proteins in the elderly with different oral health status. Food Funct 2020; 11:4535-4547. [PMID: 32396930 DOI: 10.1039/c9fo02993a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This study investigated the oral processing and bolus formation mechanisms of two soft cereal products fortified with pulse proteins, sponge-cake (FSC) and brioche (FB), in the elderly population, and their relationship with the perception of oral comfort. Twenty subjects aged 65 and over participated in the study. They were classified in two groups according to dental status (poor vs. satisfactory) and presented varying stimulated salivary flow rate (SSF). Bolus properties (hydration ratio, apparent viscosity and particle size) were characterized after three chewing stages. Results showed that subjects with a poor dental status (DS) had a longer chewing duration for FB, while individuals with a higher SSF had a shorter duration for FSC. Compared to FSC, more saliva was added to the FB boli, and the viscosity and particle size of FB bolus were also higher. Based on the bolus particle size evolution during chewing, FB was considered to be more difficult to fragment than FSC, this latter showing a dramatic particle size reduction from the beginning of chewing. From the viscosity data, a model was used to represent the variations of the bolus structure index during chewing and a coefficient of interaction of saliva with food was defined. For both products, the perception of comfort depended more on the DS than on SSF. Bolus apparent viscosity was related to the perception of oral comfort in FSC, while the chewing duration and the bolus particle size at the beginning of chewing contributed to explain oral comfort in FB. Finally, the comparison of these results with those obtained previoulsy with standard (i.e. non enriched) sponge cake and brioche suggested that the proposed protein fortification did not challenge the oral comfort perception by the elderly.
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Affiliation(s)
- M Assad-Bustillos
- INRAE UR-1268 Biopolymères Interactions et Assemblages, La Géraudière, 44316 Nantes, France.
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Tournier C, Le Goff C, Septier C, Saint-Jalmes M, Feron G, Bonhomme C, Hazart E, Van Wymelbeke V. Formulation d’aliments à destination des séniors : exemple d’une approche in vivo multidisciplinaire intégrant physiologie orale, perception sensorielle, prise alimentaire et digestion. NUTR CLIN METAB 2020. [DOI: 10.1016/j.nupar.2020.02.363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Assad-Bustillos M, Tournier C, Feron G, Guessasma S, Reguerre A, Della Valle G. Fragmentation of two soft cereal products during oral processing in the elderly: Impact of product properties and oral health status. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2019.01.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Vandenberghe-Descamps M, Labouré H, Septier C, Prot A, Tournier C, Vigneau E, Feron G, Sulmont-Rossé C. Comportement alimentaire des seniors : impact des différents facteurs de santé orale sur les dimensions de l’acte alimentaire. NUTR CLIN METAB 2018. [DOI: 10.1016/j.nupar.2018.09.058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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8
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Brignot H, Septier C, Laguerre A, Feron G. La salive peut-elle être utilisée comme un marqueur de l’état nutritionnel chez les seniors ? NUTR CLIN METAB 2018. [DOI: 10.1016/j.nupar.2018.09.187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Sulmont-Rossé C, Feron G, Hennequin M, Galan P, Hercberg S, Andreeva V. Effet de l’âge sur les consommations alimentaires et les raisons de non-consommation : résultats d’une enquête menée auprès de 32 000 adultes âgés de 20 à 80 ans. NUTR CLIN METAB 2018. [DOI: 10.1016/j.nupar.2018.09.026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Lorieau L, Septier C, Laguerre A, Le Roux L, Hazart E, Ligneul A, Famelart MH, Dupont D, Floury J, Feron G, Labouré H. Bolus quality and food comfortability of model cheeses for the elderly as influenced by their texture. Food Res Int 2018; 111:31-38. [DOI: 10.1016/j.foodres.2018.05.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 04/13/2018] [Accepted: 05/07/2018] [Indexed: 12/13/2022]
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11
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Muñoz-González C, Vandenberghe-Descamps M, Feron G, Canon F, Labouré H, Sulmont-Rossé C. Association between Salivary Hypofunction and Food Consumption in the Elderlies. A Systematic Literature Review. J Nutr Health Aging 2018; 22:407-419. [PMID: 29484355 DOI: 10.1007/s12603-017-0960-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES This systematic literature review aims to summarize the existing scientific evidence about the association between a reduced salivary function and food consumption in elderly people. METHODS A validated search strategy in two databases (PubMed and ISI Web of Knowledge) was carried out and retrieved papers together with their reference lists were screened by two independent reviewers. The quality of the included studies was critically appraised via the Quality Assessment Criteria for Evaluating Primary Research Papers. RESULTS From the originally identified studies (n=391), only 15 articles (all cross-sectional studies) met the pre-fixed inclusion/exclusion criteria. The methodological quality of the included studies was in general good, although only 3 from 15 obtained the maximum score. The control of confounding factors was the quality variable more poorly rated in the selected studies. Salivary hypofunction was associated with a decrease of the objective chewing and swallowing abilities and taste perception. Moreover, most of the selected studies showed a relationship between salivary hypofunction and food consumption (in terms of appetite loss, unbalanced dietary intake and malnutrition), although no causality could be established. CONCLUSIONS This study highlights the fact that salivary hypofunction definition and measurements are different across the studies. Therefore, future research efforts should focus on establishing a gold standard to define and identify salivary hypofunction throughout life and on performing longitudinal studies controlling for confounding factors to establish causality.
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Affiliation(s)
- C Muñoz-González
- Claire Sulmont-Rossé, INRA, CSGA, 17 rue Sully, F-21000 Dijon, France, Telephone: +33 380 69 32 71, E-mail address:
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12
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Assad-Bustillos M, Tournier C, Septier C, Della Valle G, Feron G. Relationships of oral comfort perception and bolus properties in the elderly with salivary flow rate and oral health status for two soft cereal foods. Food Res Int 2017; 118:13-21. [PMID: 30898347 DOI: 10.1016/j.foodres.2017.11.057] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 11/19/2017] [Accepted: 11/22/2017] [Indexed: 02/07/2023]
Abstract
The aim of this study was to investigate food oral processing and bolus formation in the elderly population, and their relationship with the perception of oral comfort, for two soft cereal products of different composition: sponge-cake and brioche. Twenty subjects aged 65 and over participated in the study. They were classified in two groups according to dental status (poor vs. satisfactory) and presented various stimulated salivary flow rate (SSF) in each group. Food bolus properties (hydration ratio and apparent viscosity) were characterized after three chewing stages for both groups. Results showed that chewing duration did not depend on food product but rather on physiology: subjects with a poor dental status had a shorter chewing duration. For each chewing stage, sponge-cake boli showed a higher hydration ratio than brioche boli, which showed higher apparent viscosity. For sponge-cake, perception of oral comfort was primarily driven by SSF rate, irrespective of the dental status. In the case of brioche, oral comfort was also partially explained by SSF in the case of subjects with poor dental status. This result suggests that perception of oral comfort in brioche could be driven by product related attributes rather than oral health. For both foods, a phenomenological model of bolus viscosity as a function of stimulated salivary flow and chewing duration was proposed.
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Affiliation(s)
- M Assad-Bustillos
- Centre des Sciences du Goût et de l'Alimentation, AgroSup Dijon, CNRS, INRA, Université Bourgogne Franche-Comté, F-21000 Dijon, France; INRA UR-1268 Biopolymères Interactions et Assemblages, La Géraudière, 44316 Nantes, France; CERELAB®, La Sucrerie, 21110 Aiserey, France
| | - C Tournier
- Centre des Sciences du Goût et de l'Alimentation, AgroSup Dijon, CNRS, INRA, Université Bourgogne Franche-Comté, F-21000 Dijon, France
| | - C Septier
- Centre des Sciences du Goût et de l'Alimentation, AgroSup Dijon, CNRS, INRA, Université Bourgogne Franche-Comté, F-21000 Dijon, France
| | - G Della Valle
- INRA UR-1268 Biopolymères Interactions et Assemblages, La Géraudière, 44316 Nantes, France
| | - G Feron
- Centre des Sciences du Goût et de l'Alimentation, AgroSup Dijon, CNRS, INRA, Université Bourgogne Franche-Comté, F-21000 Dijon, France.
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Guichard E, Repoux M, Qannari EM, Laboure H, Feron G. Model cheese aroma perception is explained not only by in vivo aroma release but also by salivary composition and oral processing parameters. Food Funct 2017; 8:615-628. [DOI: 10.1039/c6fo01472k] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aim of the present paper was to determine, from four model cheeses differing in fat content and firmness, the respective impacts ofin vivoaroma release, bolus rheology, chewing activity, mouth coating and salivary composition on dynamic aroma perception.
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Affiliation(s)
- E. Guichard
- UMR CSGA (Centre des Sciences du Goût et de l'Alimentation): INRA
- CNRS
- Université de Bourgogne Franche-Comte
- AgroSupDijon
- F-21000 Dijon
| | - M. Repoux
- UMR CSGA (Centre des Sciences du Goût et de l'Alimentation): INRA
- CNRS
- Université de Bourgogne Franche-Comte
- AgroSupDijon
- F-21000 Dijon
| | - E. M. Qannari
- LUNAM University
- ONIRIS
- USC “Sensometrics and Chemometrics Laboratory”
- Nantes
- France
| | - H. Laboure
- UMR CSGA (Centre des Sciences du Goût et de l'Alimentation): INRA
- CNRS
- Université de Bourgogne Franche-Comte
- AgroSupDijon
- F-21000 Dijon
| | - G. Feron
- UMR CSGA (Centre des Sciences du Goût et de l'Alimentation): INRA
- CNRS
- Université de Bourgogne Franche-Comte
- AgroSupDijon
- F-21000 Dijon
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Vors C, Drai J, Gabert L, Laville M, Guichard E, Brignot H, Michalski MC, Feron G. Relation entre composition salivaire, obésité et métabolisme lipidique postprandial chez l’Homme. NUTR CLIN METAB 2016. [DOI: 10.1016/j.nupar.2016.09.132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Vors C, Drai J, Gabert L, Pineau G, Laville M, Vidal H, Guichard E, Michalski MC, Feron G. Salivary composition in obese vs normal-weight subjects: towards a role in postprandial lipid metabolism? Int J Obes (Lond) 2015; 39:1425-8. [PMID: 25916910 DOI: 10.1038/ijo.2015.71] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 04/07/2015] [Accepted: 04/22/2015] [Indexed: 11/09/2022]
Abstract
In the pathophysiological context of obesity, oral exposure to dietary fat can modulate lipid digestion and absorption, but underlying in-mouth mechanisms have not been clearly identified. Therefore, we tested the hypothesis that salivary components related to dietary fat sensitivity would differ according to body mass index (BMI) and postprandial lipid metabolism in young men. Saliva was collected from nine normal-weight (BMI=22.3±0.5 kg m(-2)) and nine non-morbid obese (BMI=31.7±0.3 kg m(-2)) men before an 8-h postprandial metabolic exploration test involving the consumption of a 40-g fat meal, in which obese subjects revealed a delayed postprandial lipid metabolism. Nine salivary characteristics (flow, protein content, lipolysis, amylase, proteolysis, total antioxidant status, lysozyme, lipocalin 1 and carbonic anhydrase-VI) were investigated. We show that, under fasting conditions, salivary lipolysis was lower in obese vs normal-weight subjects, whereas proteolysis and carbonic anhydrase VI were higher. We reveal through multivariate and Mann-Whitney analysis that differences in fasting salivary lipolysis and proteolysis between both groups are related to differences in postprandial lipid metabolism including exogenous fatty-acid absorption and β-oxidation. These results suggest a potential role of salivary composition on postprandial lipid metabolism and bring novel causal hypotheses on the links between salivary composition, sensitivity to dietary fat oral income and postprandial lipid metabolism according to BMI.
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Affiliation(s)
- C Vors
- INRA, UMR 1397, CarMeN Laboratory, Univ Lyon-1, Oullins, France.,INSERM U1060, CarMeN Laboratory, Oullins, France.,Centre de Recherche en Nutrition Humaine Rhône-Alpes (CRNH-RA) and Centre Européen pour la Nutrition et la Santé (CENS), Pierre-Bénite, France
| | - J Drai
- Laboratoire de Biochimie, Centre Hospitalier Lyon Sud, Pierre-Bénite, France
| | - L Gabert
- INRA, UMR 1397, CarMeN Laboratory, Univ Lyon-1, Oullins, France.,Centre de Recherche en Nutrition Humaine Rhône-Alpes (CRNH-RA) and Centre Européen pour la Nutrition et la Santé (CENS), Pierre-Bénite, France
| | - G Pineau
- INRA, UMR 1397, CarMeN Laboratory, Villeurbanne, France.,INSA-Lyon, IMBL, Villeurbanne, France
| | - M Laville
- INRA, UMR 1397, CarMeN Laboratory, Univ Lyon-1, Oullins, France.,Centre de Recherche en Nutrition Humaine Rhône-Alpes (CRNH-RA) and Centre Européen pour la Nutrition et la Santé (CENS), Pierre-Bénite, France
| | - H Vidal
- INRA, UMR 1397, CarMeN Laboratory, Univ Lyon-1, Oullins, France.,INSERM U1060, CarMeN Laboratory, Oullins, France
| | - E Guichard
- CNRS, UMR6265 Centre des Sciences du Goût et de l'Alimentation, Dijon, France.,INRA, UMR1324 Centre des Sciences du Goût et de l'Alimentation, Dijon, France.,Université de Bourgogne, UMR Centre des Sciences du Goût et de l'Alimentation, Dijon, France
| | - M-C Michalski
- INRA, UMR 1397, CarMeN Laboratory, Univ Lyon-1, Oullins, France.,INRA, UMR 1397, CarMeN Laboratory, Villeurbanne, France.,INSA-Lyon, IMBL, Villeurbanne, France.,Centre de Recherche en Nutrition Humaine Rhône-Alpes (CRNH-RA) and Centre Européen pour la Nutrition et la Santé (CENS), Pierre-Bénite, France
| | - G Feron
- CNRS, UMR6265 Centre des Sciences du Goût et de l'Alimentation, Dijon, France.,INRA, UMR1324 Centre des Sciences du Goût et de l'Alimentation, Dijon, France.,Université de Bourgogne, UMR Centre des Sciences du Goût et de l'Alimentation, Dijon, France
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Tournier C, Rodrigues J, Canon F, Salles C, Feron G. A Method to Evaluate Chewing Efficiency in Infants Through Food Bolus Characterization: A Preliminary Study. J Texture Stud 2015. [DOI: 10.1111/jtxs.12116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- C. Tournier
- UMR6265 Centre des Sciences du Goût et de l'Alimentation; CNRS; Dijon F-21000 France
- UMR1324 Centre des Sciences du Goût et de l'Alimentation; INRA; Dijon F-21000 France
- UMR Centre des Sciences du Goût et de l'Alimentation; Université de Bourgogne; Dijon F-21000 France
| | - J. Rodrigues
- UMR6265 Centre des Sciences du Goût et de l'Alimentation; CNRS; Dijon F-21000 France
- UMR1324 Centre des Sciences du Goût et de l'Alimentation; INRA; Dijon F-21000 France
- UMR Centre des Sciences du Goût et de l'Alimentation; Université de Bourgogne; Dijon F-21000 France
| | - F. Canon
- UMR6265 Centre des Sciences du Goût et de l'Alimentation; CNRS; Dijon F-21000 France
- UMR1324 Centre des Sciences du Goût et de l'Alimentation; INRA; Dijon F-21000 France
- UMR Centre des Sciences du Goût et de l'Alimentation; Université de Bourgogne; Dijon F-21000 France
| | - C. Salles
- UMR6265 Centre des Sciences du Goût et de l'Alimentation; CNRS; Dijon F-21000 France
- UMR1324 Centre des Sciences du Goût et de l'Alimentation; INRA; Dijon F-21000 France
- UMR Centre des Sciences du Goût et de l'Alimentation; Université de Bourgogne; Dijon F-21000 France
| | - G. Feron
- UMR6265 Centre des Sciences du Goût et de l'Alimentation; CNRS; Dijon F-21000 France
- UMR1324 Centre des Sciences du Goût et de l'Alimentation; INRA; Dijon F-21000 France
- UMR Centre des Sciences du Goût et de l'Alimentation; Université de Bourgogne; Dijon F-21000 France
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Poette J, Mekoué J, Neyraud E, Berdeaux O, Renault A, Guichard E, Genot C, Feron G. Fat sensitivity in humans: oleic acid detection threshold is linked to saliva composition and oral volume. FLAVOUR FRAG J 2013. [DOI: 10.1002/ffj.3177] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- J. Poette
- CNRS; UMR6265 Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- INRA; UMR1324 Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- Université de Bourgogne; UMR Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- St Hubert; 94526 Rungis France
| | - J. Mekoué
- INRA; UR1268, Biopolymères, Interactions, Assemblages; F- 44316 Nantes France
| | - E. Neyraud
- CNRS; UMR6265 Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- INRA; UMR1324 Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- Université de Bourgogne; UMR Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
| | - O. Berdeaux
- CNRS; UMR6265 Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- INRA; UMR1324 Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- Université de Bourgogne; UMR Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
| | | | - E. Guichard
- CNRS; UMR6265 Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- INRA; UMR1324 Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- Université de Bourgogne; UMR Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
| | - C. Genot
- INRA; UR1268, Biopolymères, Interactions, Assemblages; F- 44316 Nantes France
| | - G. Feron
- CNRS; UMR6265 Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- INRA; UMR1324 Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
- Université de Bourgogne; UMR Centre des Sciences du Goût et de l'Alimentation; F- 21000 Dijon France
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Repoux M, Septier C, Palicki O, Guichard E, Feron G, Laboure H. Solid cheese consumption: Quantification of oral coating. Arch Oral Biol 2012; 57:81-6. [DOI: 10.1016/j.archoralbio.2011.07.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Revised: 05/24/2011] [Accepted: 07/28/2011] [Indexed: 11/30/2022]
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Drago S, Panouillé M, Saint-Eve A, Neyraud E, Feron G, Souchon I. Relationships between saliva and food bolus properties from model dairy products. Food Hydrocoll 2011. [DOI: 10.1016/j.foodhyd.2010.07.024] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Michelon D, Abraham S, Ebel B, De Coninck J, Husson F, Feron G, Gervais P, Cachon R. Contribution of exofacial thiol groups in the reducing activity of Lactococcus lactis. FEBS J 2010; 277:2282-90. [PMID: 20423456 DOI: 10.1111/j.1742-4658.2010.07644.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Lactococcus lactis can decrease the redox potential at pH 7 (E(h7)) from 200 to -200 mV in oxygen free Man-Rogosa-Sharpe media. Neither the consumption of oxidizing compounds or the release of reducing compounds during lactic acid fermentation were involved in the decrease in E(h7) by the bacteria. Thiol groups located on the bacterial cell surface appear to be the main components that are able to establish a greater exchange current between the Pt electrode and the bacteria. After the final E(h7) (-200 mV) was reached, only thiol-reactive reagents could restore the initial E(h7) value. Inhibition of the proton motive force showed no effect on maintaining the final E(h7) value. These results suggest that maintaining the exofacial thiol (-SH) groups in a reduced state does not depend on an active mechanism. Thiol groups appear to be displayed by membrane proteins or cell wall-bound proteins and may participate in protecting cells against oxidative stress.
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Affiliation(s)
- D Michelon
- Laboratoire de Génie des Procédés Microbiologiques et Alimentaires, AgroSup Dijon, Université de Bourgogne, Dijon, France
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Pham TH, Mauvais G, Vergoignan C, De Coninck J, Dumont F, Lherminier J, Cachon R, Feron G. Gaseous environments modify physiology in the brewing yeastSaccharomyces cerevisiaeduring batch alcoholic fermentation. J Appl Microbiol 2008; 105:858-74. [DOI: 10.1111/j.1365-2672.2008.03821.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
AIMS To investigate the enzymatic aldol reaction between acetone as a donor and 4-hydroxybenzaldehyde as a receptor to generate 4-(4-hydroxyphenyl)-but-3-ene-2-one or 4-hydroxybenzylidene acetone, the direct precursor of 4-(4-hydroxyphenyl)-butan-2-one or raspberry ketone, using different species of filamentous fungi and bacteria. METHODS AND RESULTS Different classes of micro-organisms were tested in a medium containing mainly acetone and 4-hydoxybenzaldehyde. Of the micro-organisms tested, only bacteria were able to synthesize significant amounts of 4-hydroxybenzylidene acetone, ranging from 15 to 160 mg l(-1) after 21 h of bioconversion, as a function of the bacteria tested. CONCLUSIONS The biological production of 4-hydroxybenzylidene acetone has been described with bacteria possessing 2-deoxyribose-5-phosphate aldolase (DERA, EC 4.1.2.4). This result suggests that DERA is involved in the catalytic aldolization of precursors for the production of 4-hydroxybenzylidene acetone. SIGNIFICANCE AND IMPACT OF THE STUDY Raspberry ketone or frambinone represents a total market value of between euro6 million and euro10 million. The possibility of producing its direct precursor through a simple process using bacteria is of considerable interest to the flavour market and the food industry as a whole. This paper broadens the spectrum for the use of aldolase to achieve the biological synthesis of compounds of interest.
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Affiliation(s)
- G Feron
- Laboratoire de Microbiologie, UMR INRA-UB 1232, 17 rue Sully, Dijon Cedex, France.
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Kieronczyk A, Cachon R, Feron G, Yvon M. Addition of oxidizing or reducing agents to the reaction medium influences amino acid conversion to aroma compounds by Lactococcus lactis. J Appl Microbiol 2006; 101:1114-22. [PMID: 17040235 DOI: 10.1111/j.1365-2672.2006.02999.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS The aim of this research was to investigate the impact of extracellular redox potential (Eh) on amino acid conversion to aroma compounds by Lactococcus lactis that is commonly used as a starter in the cheese industry. METHODS AND RESULTS The study was realized in vitro by incubating resting cells of L. lactis in reaction media in which E(h) was modified by the addition of oxidizing or reducing agents. Oxidative condition (+300 mV) favoured the production of aldehydes and volatile sulfur compounds responsible for malty, floral, fruity, almond and cabbage aroma. This production was mainly the result of a chemical oxidation of the alpha-keto acids produced by amino acid transamination. In contrast, reducing condition (-200 mV) stimulated the production of carboxylic acids such as phenylacetic, methylthiopropionic and isovaleric acids, which contribute to the very-ripened-cheese aroma as well as the production of hydroxy acids. CONCLUSIONS Eh of the medium highly influences the nature of aroma compounds produced from amino acid catabolism by the resting cells of L. lactis. SIGNIFICANCE AND IMPACT OF THE STUDY E(h) is a parameter that is not controlled during cheese production. Its control throughout cheese making and ripening could permit control of aroma formation in cheese.
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Affiliation(s)
- A Kieronczyk
- Unité de Biochimie et Structure des Protéines, INRA, Jouy-en-Josas, France
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Waché Y, Husson F, Feron G, Belin JM. Yeast as an efficient biocatalyst for the production of lipid-derived flavours and fragrances. Antonie Van Leeuwenhoek 2006; 89:405-16. [PMID: 16779636 DOI: 10.1007/s10482-005-9049-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/21/2005] [Indexed: 11/29/2022]
Abstract
Responding to consumer' demand for natural products, biotechnology is constantly seeking new biocatalysts. In the field of hydrophobic substrate degradation, some yeast species known some years ago as non-conventional, have acquired their right to be considered as good biocatalysts. These Candida, Yarrowia, Sporobolomyces ... are now used for themselves or for their lipases in processes to produce flavours and fragrances. In this paper we present some examples of use of these biocatalysts to generate high-value compounds and discuss the new trends related to progress in the development of molecular tools or the mastering of the redox characteristics of the medium.
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Affiliation(s)
- Y Waché
- Laboratoire de Microbiologie UMR UB-INRA, ENSBANA, 1 esplanade Erasme, 21000, Dijon, France.
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Stentelaire C, Antoine N, Cabrol C, Feron G, Durand A. Development of a rapid and highly sensitive biochemical method for the measurement of fungal spore viability. An alternative to the CFU method. Enzyme Microb Technol 2001. [DOI: 10.1016/s0141-0229(01)00432-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Engelvin G, Feron G, Perrin C, Mollé D, Talon R. Identification of beta-oxidation and thioesterase activities in Staphylococcus carnosus 833 strain. FEMS Microbiol Lett 2000; 190:115-20. [PMID: 10981700 DOI: 10.1111/j.1574-6968.2000.tb09272.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Staphylococcus carnosus 833, inoculated into sausage meat, increased the level of methyl ketones, which contributed to the cured aroma. These ketones can arise from incomplete beta-oxidation followed by two enzymatic activities: a thioesterase and a decarboxylase. In this study we identified the beta-oxidative pathway (through the measure of 3-hydroxyacyl-CoA dehydrogenase activity) and the thioesterase activity in extracts of S. carnosus cells grown in the presence of different methyl esters. The beta-oxidative system was induced by methyl esters and highest induction was found with a 12-carbon substrate. It was specific for medium chain length fatty acyl CoA substrates. Its maximal activity was observed at the end of stationary growth phase. HPLC analyses of acyl-CoA after incubation of cell extracts with palmitoyl-CoA showed that the beta-oxidation system released preferentially long chain hydroxyacyl-CoAs, enoyl-CoAs, and acyl-CoAs. The time-course of intermediate formation indicated a precursor product relationship indicative of a model of free intermediates which could be further deacylated by a thioesterase. The thioesterase activity was enhanced when S. carnosus was grown in the presence of methyl esters with at least 12 carbons and this enzyme was specific for short chain acyl-CoAs. The maximal activity was reached at the stationary growth phase.
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Affiliation(s)
- G Engelvin
- INRA Clermont-Ferrand, Station de Recherches sur la Viande, Saint-Genès Champanelle, France
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Blin-Perrin C, Molle D, Dufosse L, Le-Quere JL, Viel C, Mauvais G, Feron G. Metabolism of ricinoleic acid into gamma-decalactone: beta-oxidation and long chain acyl intermediates of ricinoleic acid in the genus Sporidiobolus sp. FEMS Microbiol Lett 2000; 188:69-74. [PMID: 10867236 DOI: 10.1111/j.1574-6968.2000.tb09170.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
In order to study differences in gamma-decalactone production in yeast, four species of Sporidiobolus were cultivated with 5% of methyl ricinoleate as the lactone substrate. In vivo studies showed different time courses of intermediates of ricinoleic acid breakdown between the four species. In vitro studies of the beta-oxidation system were conducted with crude cell extracts of Sporidiobolus spp. and with ricinoleyl-CoA (RCoA) as substrate. The beta-oxidation was detected by measuring acyl-CoA oxidase, 3-hydroxyacyl-CoA dehydrogenase activities, and acetyl-CoA production. The time courses of the CoA esters resulting from RCoA breakdown by crude extract of Sporidiobolus spp. permit the proposal of different metabolic models in the yeast. These models explained the differences observed during in vivo studies.
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Affiliation(s)
- C Blin-Perrin
- Laboratoire de Recherche sur les Arômes, Institut National de la Recherche Agronomique, Dijon, France
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Wang XD, Mauvais G, Cachon R, Diviès C, Feron G. Addition of reducing agent dithiothreitol improves 4-decanolide synthesis by the genus Sporidiobolus. J Biosci Bioeng 2000; 90:338-40. [PMID: 16232867 DOI: 10.1016/s1389-1723(00)80092-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2000] [Accepted: 06/09/2000] [Indexed: 11/16/2022]
Abstract
Two species of the genus Sporidiobolus, S. johnsonii and S. ruinenii, were used to study the effect of the reducing agent, dithiothreitol (DTT), on 4-decanolide production using ricinoleic acid as the substrate. The results indicate that the addition of DTT into the cultures significantly enhanced 4-decanolide biosynthesis by the two species.
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Affiliation(s)
- X D Wang
- UMR de Microbiologie, Université de Bourgogne-ENSBANA-INRA, 1 Esplanade Erasme, Dijon, France
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Feron G, Dufossé L, Mauvais G, Bonnarme P, Spinnler HE. Fatty acid accumulation in the yeast Sporidiobolus salmonicolor during batch production of gamma-decalactone. FEMS Microbiol Lett 1997; 149:17-24. [PMID: 9103973 DOI: 10.1111/j.1574-6968.1997.tb10302.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
This paper provides new information about the metabolism of various fatty acids and gamma-decalactone production by yeast. An analysis of the fatty acid composition of the yeast Sporidiobolus salmonicolor during batch production of lactone with ricinoleic acid methyl ester as a precursor showed an accumulation of the gamma-decalactone precursor inside the cells. Electron microscopy of the yeasts showed the presence of large internal inclusions leading to membrane and organelle lysis and, consequently, death of the yeast. S. salmonicolor cultivated with methyl oleate did not produce gamma-decalactone and is viable during the whole culture. Analysis of the long chain fatty acid fraction showed incorporation of methyl oleate.
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Affiliation(s)
- G Feron
- Laboratoire de Recherches sur les Arômes, Institut National de la Recherche Agronomique, Dijon, France.
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Feron G, Dufosse L, Pierard E, Bonnarme P, Quere JL, Spinnler H. Production, Identification, and Toxicity of (gamma)-Decalactone and 4-Hydroxydecanoic Acid from Sporidiobolus spp. Appl Environ Microbiol 1996; 62:2826-31. [PMID: 16535376 PMCID: PMC1388914 DOI: 10.1128/aem.62.8.2826-2831.1996] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
During the bioconversion of ricinoleic acid to (gamma)-decalactone under controlled pH conditions, Sporidiobolus salmonicolor produced only the lactone form, while Sporidiobolus ruinenii produced both the lactone form and a precursor. By using gas chromatography-mass spectrometry and gas chromatography-Fourier transform infrared analysis techniques, the precursor was identified as 4-hydroxydecanoic acid. The levels of production in the presence of high concentrations of ricinoleic acid methyl ester differed in the two Sporidiobolus species. This difference was due on the one hand to the high sensitivity of S. salmonicolor to the lactone and on the other hand to the high level of 4-hydroxydecanoic acid produced by S. ruinenii. 4-Hydroxydecanoic acid is much less toxic to the microorganisms than the lactone. In contrast to S. ruinenii, S. salmonicolor is not able to catabolize 4-hydroxydecanoic acid.
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Clastre M, Bantignies B, Feron G, Soler E, Ambid C. Purification and Characterization of Geranyl Diphosphate Synthase from Vitis vinifera L. cv Muscat de Frontignan Cell Cultures. Plant Physiol 1993; 102:205-211. [PMID: 12231811 PMCID: PMC158764 DOI: 10.1104/pp.102.1.205] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
A geranyl diphosphate synthase (EC 2.5.1.1), which catalyzes the formation of geranyl diphosphate from dimethylallyl diphosphate and isopentenyl diphosphate, was isolated from Vitis vinifera L. cv Muscat de Frontignan cell cultures. Purification of the enzyme was achieved successively by ammonium sulfate precipitation and chromatography on DEAE-Sephacel, hydroxylapatite, Mono Q, Phenyl Superose, Superose 12, and preparative nondenaturing polyacrylamide gels. The enzyme formed only geranyl diphosphate as a product. In all cases, neither neryl diphosphate, the cis isomer, nor farnesyl diphosphate was detected. The enzyme showed a native molecular mass of 68 [plus or minus] 5 kD as determined by gel permeation. On sodium dodecyl sulfate polyacrylamide gels, geranyl diphosphate synthase purified to electrophoretic homogeneity migrated with a molecular mass of 66 [plus or minus] 2 kD. Michaelis constants for isopentenyl diphosphate and dimethylallyl diphosphate were 8.5 and 56.8 [mu]M, respectively. The enzyme required Mn2+ and Mg2+ as cofactors and its activity was enhanced by Triton X-100. Inorganic pyrophosphate, aminophenylethyl diphosphate, and geranyl diphosphate had inhibitory effects on the enzyme.
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Affiliation(s)
- M. Clastre
- Ecole Nationale Superieure Agronomique, 145 Avenue de Muret, F-31076 Toulouse Cedex, France
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Soler E, Feron G, Clastre M, Dargent R, Gleizes M, Ambid C. Evidence for a geranyl-diphosphate synthase located within the plastids of Vitis vinifera L. cultivated in vitro. Planta 1992; 187:171-175. [PMID: 24178039 DOI: 10.1007/bf00201934] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/30/1991] [Indexed: 06/02/2023]
Abstract
Intact plastids from cell suspensions of Vitis vinifera L. cv. Muscat de Frontignan, free of detectable contamination by other particles as judged by the distribution of organelle-specific marker enzymes and by electron microscopy, exhibit geranyl-diphosphate synthase activity (EC 2.5.1.1). This synthase activity remains stable after tryptic digestion of unlysed organelles and is enhanced by plastid disruption. We conclude that the enzyme is located within the organelle. The possibility of an isopentenyl diphosphate/dimethylallyl diphosphate translocating system which would play a major role in the regulation of monoterpene metabolism is discussed.
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Affiliation(s)
- E Soler
- Laboratoire de Biotechnologie et Amélioration des Plantes, Ecole Nationale Supérieure Agronomique, 145 avenue de Muret, F-31076, Toulouse Cédex, France
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Abstract
Two prenyltransferases were located in cell cultures of Vitis vinifera. A geranyl pyrophosphate synthase (EC 2.5.1.1) was associated with plastid-like membranes whereas a farnesyl pyrophosphate synthase (EC 2.5.1.10) was found to be soluble.
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Affiliation(s)
- G Feron
- Ecole Nationale Supérieure Agronomique, Toulouse, France
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