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Graziosi S, Puliga F, Iotti M, Amicucci A, Zambonelli A. In vitro interactions between Bradyrhizobium spp. and Tuber magnatum mycelium. ENVIRONMENTAL MICROBIOLOGY REPORTS 2024; 16:e13271. [PMID: 38692852 PMCID: PMC11062863 DOI: 10.1111/1758-2229.13271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 04/06/2024] [Indexed: 05/03/2024]
Abstract
Tuber magnatum is the most expensive truffle, but its large-scale cultivation is still a challenge compared to other valuable Tuber species. T. magnatum mycelium has never been grown profitably until now, which has led to difficulties to studying it in vitro. This study describes beneficial interactions between T. magnatum mycelium and never before described bradyrhizobia, which allows the in vitro growth of T. magnatum mycelium. Three T. magnatum strains were co-isolated on modified Woody Plant Medium (mWPM) with aerobic bacteria and characterised through microscopic observations. The difficulties of growing alone both partners, bacteria and T. magnatum mycelium, on mWPM demonstrated the reciprocal dependency. Three bacterial isolates for each T. magnatum strain were obtained and molecularly characterised by sequencing the 16S rRNA, glnII, recA and nifH genes. Phylogenetic analyses showed that all nine bacterial strains were distributed among five subclades included in a new monophyletic lineage belonging to the Bradyrhizobium genus within the Bradyrhizobium jicamae supergroup. The nifH genes were detected in all bacterial isolates, suggesting nitrogen-fixing capacities. This is the first report of consistent T. magnatum mycelium growth in vitro conditions. It has important implications for the development of new technologies in white truffle cultivation and for further studies on T. magnatum biology and genetics.
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Affiliation(s)
- Simone Graziosi
- Department of Agricultural and Food SciencesUniversity of BolognaBolognaItaly
| | - Federico Puliga
- Department of Agricultural and Food SciencesUniversity of BolognaBolognaItaly
| | - Mirco Iotti
- Department of Life, Health and Environmental ScienceUniversity of L'AquilaL'AquilaItaly
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Epping R, Lisec J, Koch M. Changes in Black Truffle ( Tuber melanosporum) Aroma during Storage under Different Conditions. J Fungi (Basel) 2024; 10:354. [PMID: 38786709 PMCID: PMC11121890 DOI: 10.3390/jof10050354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Revised: 05/07/2024] [Accepted: 05/11/2024] [Indexed: 05/25/2024] Open
Abstract
The enticing aroma of truffles is a key factor for their culinary value. Although all truffle species tend to be pricy, the most intensely aromatic species are the most sought after. Research into the aroma of truffles encompasses various disciplines including chemistry, biology, and sensory science. This study focusses on the chemical composition of the aroma of black truffles (Tuber melanosporum) and the changes occurring under different storage conditions. For this, truffle samples were stored under different treatments, at different temperatures, and measured over a total storage time of 12 days. Measurements of the truffle aroma profiles were taken with SPME/GC-MS at regular intervals. To handle the ample data collected, a systematic approach utilizing multivariate data analysis techniques was taken. This approach led to a vast amount of data which we made publicly available for future exploration. Results reveal the complexity of aroma changes, with 695 compounds identified, highlighting the need for a comprehensive understanding. Principal component analyses offer initial insights into truffle composition, while individual compounds may serve as markers for age (formic acid, 1-methylpropyl ester), freshness (2-Methyl-1-propanal; 1-(methylthio)-propane), freezing (tetrahydrofuran), salt treatment (1-chloropentane), or heat exposure (4-hydroxy-3-methyl-2-butanone). This research suggests that heat treatment or salt contact significantly affects truffle aroma, while freezing and cutting have less pronounced effects in comparison. The enrichment of compounds showing significant changes during storage was investigated with a metabolomic pathway analysis. The involvement of some of the enriched compounds on the pyruvate/glycolysis and sulfur pathways was shown.
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Affiliation(s)
| | | | - Matthias Koch
- Department of Analytical Chemistry and Reference Materials, Bundesanstalt für Materialforschung und-Prüfung (BAM), 12489 Berlin, Germany; (R.E.); (J.L.)
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Li Q, Hu H, Tan X, Wang J, Mei R, Jiang F, Ling Y, Li X. Effects of Storage in an Active and Spontaneous Controlled O 2/CO 2 Atmosphere on Volatile Flavor Components and the Microbiome of Truffles. ACS OMEGA 2024; 9:9331-9347. [PMID: 38434872 PMCID: PMC10905597 DOI: 10.1021/acsomega.3c08375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 01/29/2024] [Accepted: 01/31/2024] [Indexed: 03/05/2024]
Abstract
This study explored the potential to improve the storage quality and prolong the shelf life of truffles by storing them in a modified atmosphere fresh-keeping box with sealed gas components of Active Modified Atmosphere Packaging (AMAP, 40% O2 + 60% CO2) at 4 °C. During the storage period, a total of 63 volatile components in 10 categories were detected, with aldehydes being the most abundant and the relative content of ethers being the highest. The relative odor activity value and principal component analysis revealed that isovaleraldehyde, 1-octen-3-ol, 1-octen-3-one, and dimethyl sulfide were the characteristic flavor components of fresh truffles. However, 3-methylthiopropionaldehyde and (E, E)-2,4-nonadienal were the components that caused the deterioration of truffle flavor and could potentially serve as markers of truffle decay characteristics. 16S rDNA high-throughput sequencing showed that Leuconostoc and Lactococcus were dominant in the truffle samples stored for 14 days, but the abundance of putrefactive pathogenic bacteria showed an increasing trend in the truffle samples stored for 28 days. During the whole storage period, the common fungi detected in the different treatment groups were Candida and Aspergillus. The relative abundance of the former decreased, while the relative abundance of the latter decreased initially and then increased. The correlation between volatile components and the microbial flora was further analyzed, which indicated that Lactococcus and Lactobacillus had the same contributions to the same flavor, while Pseudomonas and Glutamicibacter had the opposite contributions to the same flavor. The results provide a reference for the storage and preservation of truffles.
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Affiliation(s)
- Qiang Li
- School of Food and Biological
Engineering, Chengdu University, Chengdu, Sichuan 610106, China
| | - Haiyang Hu
- School of Food and Biological
Engineering, Chengdu University, Chengdu, Sichuan 610106, China
| | - Xingyi Tan
- School of Food and Biological
Engineering, Chengdu University, Chengdu, Sichuan 610106, China
| | - Jianhui Wang
- School of Food and Biological
Engineering, Chengdu University, Chengdu, Sichuan 610106, China
| | - Ruhuai Mei
- School of Food and Biological
Engineering, Chengdu University, Chengdu, Sichuan 610106, China
| | - Fangguo Jiang
- School of Food and Biological
Engineering, Chengdu University, Chengdu, Sichuan 610106, China
| | - Yunkun Ling
- School of Food and Biological
Engineering, Chengdu University, Chengdu, Sichuan 610106, China
| | - Xiang Li
- School of Food and Biological
Engineering, Chengdu University, Chengdu, Sichuan 610106, China
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Tejedor-Calvo E, Garcia-Barreda S, Sebastián Dambolena J, Pelissero D, Sánchez S, Marco P, Nouhra E. Aromatic profile of black truffle grown in Argentina: Characterization of commercial categories and alterations associated to maturation, harvesting date and orchard management practices. Food Res Int 2023; 173:113300. [PMID: 37803611 DOI: 10.1016/j.foodres.2023.113300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 07/17/2023] [Accepted: 07/20/2023] [Indexed: 10/08/2023]
Abstract
Black truffle (Tuber melanosporum) is one of the most appreciated fungi in the world mainly due to its aromatic properties. In the emerging markets such as Argentina, the aroma of locally produced truffles has not been described yet. The volatile organic compounds (VOCs) from 102 black truffles from Argentina were analyzed using solid phase microextraction gas chromatography coupled with mass spectrometer detector (SPME-GC-MS). Several factors such as commercial category, maturity stage, host tree, geographical origin, and aromatic defects detected during classification were also registered and considered. As a result, 79 VOCs were detected, among which 2-methyl-propanal, 2-butanone, 2-methyl-1-propanol, butanal-3-methyl, 3-methyl-1-butanol, 2-methyl-1-butanol were present in high percentage in fresh mature truffles, whereas immature truffles were associated with 3,5-dimethoxytoluene, 2-phenyl-2-butenal, 2,3-dimethoxytoluene. The Argentine black truffles showed significant similarities in their aromatic profile when compared with their Australian and European counterparts, but with some distinctive notes.
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Affiliation(s)
- Eva Tejedor-Calvo
- Department of Plant Science, Agrifood Research and Technology Centre of Aragon (CITA), Agrifood Institute of Aragón - IA2 (CITA-Zaragoza University), Av. Montañana, 930, 50059 Zaragoza, Spain.
| | - Sergi Garcia-Barreda
- Department of Plant Science, Agrifood Research and Technology Centre of Aragon (CITA), Agrifood Institute of Aragón - IA2 (CITA-Zaragoza University), Av. Montañana, 930, 50059 Zaragoza, Spain
| | - José Sebastián Dambolena
- Instituto Multidisciplinario de Biología Vegetal (CONICET), FCEFyN, Universidad Nacional de Córdoba (UNC), CC 495, CP 5000 Córdoba, Argentina
| | - David Pelissero
- Instituto Multidisciplinario de Biología Vegetal (CONICET), FCEFyN, Universidad Nacional de Córdoba (UNC), CC 495, CP 5000 Córdoba, Argentina
| | - Sergio Sánchez
- Department of Plant Science, Agrifood Research and Technology Centre of Aragon (CITA), Agrifood Institute of Aragón - IA2 (CITA-Zaragoza University), Av. Montañana, 930, 50059 Zaragoza, Spain
| | - Pedro Marco
- Department of Plant Science, Agrifood Research and Technology Centre of Aragon (CITA), Agrifood Institute of Aragón - IA2 (CITA-Zaragoza University), Av. Montañana, 930, 50059 Zaragoza, Spain
| | - Eduardo Nouhra
- Instituto Multidisciplinario de Biología Vegetal (CONICET), FCEFyN, Universidad Nacional de Córdoba (UNC), CC 495, CP 5000 Córdoba, Argentina
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Bucci A, Monaco P, Naclerio G. Tuber magnatum Picco: the challenge to identify ascoma-associated bacteria as markers for geographic traceability. Front Microbiol 2023; 14:1142214. [PMID: 37260692 PMCID: PMC10227511 DOI: 10.3389/fmicb.2023.1142214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 05/02/2023] [Indexed: 06/02/2023] Open
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Tejedor-Calvo E, García-Barreda S, Sanz MÁ, Gracia AP, Sánchez S, Marco P. Black truffle aroma transfer kinetics to food matrices. Food Chem 2023; 417:135814. [PMID: 36898224 DOI: 10.1016/j.foodchem.2023.135814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 02/18/2023] [Accepted: 02/26/2023] [Indexed: 03/06/2023]
Abstract
Nowadays black truffles are so highly valued that truffled products are available in supermarkets whereas fresh truffle is mainly used in the restaurants. It is known that truffle aroma can change because heat treatments, but there is no scientific evidence about what molecules are transferred, in which concentration, and how much time is needed to aromatize products with truffle. In this study, four different fat-based food products (milk, sunflower oil, grapeseed oil and egg's yolk), were used to study black truffle (Tuber melanosporum) aroma transference for 14 days. Gas chromatography and olfactometry results showed different volatile organic compounds profile depending on the matrix used. After 24 h, some key truffle aromatic compounds were detected in all the food matrices. Among them, grape seed oil was the most aromatized product probably because of its odorless properties. According to our results, dimethyl disulphide, 3-methyl-1-butanol and 1-octen-3-one odorants showed the highest aromatization power.
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Affiliation(s)
- Eva Tejedor-Calvo
- Department of Plant Science, Agrifood Research and Technology Centre of Aragón (CITA). Avda. Montañana 930, 50059 Zaragoza, Spain.
| | - Sergi García-Barreda
- Department of Plant Science, Agrifood Research and Technology Centre of Aragón (CITA). Avda. Montañana 930, 50059 Zaragoza, Spain
| | - María Ángeles Sanz
- Laboratories and Technological Assistance, Agrifood Research and Technology Centre of Aragon (CITA), Avda. Montãnana, 50059 Zaragoza, Spain
| | - Ana Pilar Gracia
- Plant Food Research Group, Department of Food Technology, University of Zaragoza-IA2 (Zaragoza University-CITA), C/Miguel Servet 177, 50013 Zaragoza, Spain
| | - Sergio Sánchez
- Department of Plant Science, Agrifood Research and Technology Centre of Aragón (CITA). Avda. Montañana 930, 50059 Zaragoza, Spain
| | - Pedro Marco
- Department of Plant Science, Agrifood Research and Technology Centre of Aragón (CITA). Avda. Montañana 930, 50059 Zaragoza, Spain
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Monaco P, Naclerio G, Mello A, Bucci A. Role and potentialities of bacteria associated with Tuber magnatum: A mini-review. Front Microbiol 2022; 13:1017089. [PMID: 36274685 PMCID: PMC9584545 DOI: 10.3389/fmicb.2022.1017089] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 09/02/2022] [Indexed: 11/13/2022] Open
Abstract
Among the hypogeous ectomycorrhizal fungi, the white truffle Tuber magnatum Picco is the species of greatest interest, both from an ecological and economic point of view. The increasing market demand of the precious white truffle along with the fall in its natural production led to a growing interest in cultivation techniques and encouraged truffle growers and researchers to deeper investigate factors that could affect and improve T. magnatum productivity. In this context, microbial communities play a central role. Indeed, in the last few years, the hypothesis of a potential link between microbial community composition and truffle orchard productivity is arousing a greater attention. Moreover, since the value of the prized T. magnatum can vary in relation to its provenience, the need to define a reliable tracking system is also emerging and bacteria appear to be a promising tool. Accordingly, the present mini-review summarises the knowledge currently available on T. magnatum microbial communities, focusing on the role of truffle-associated bacteria and highlighting similarities and differences between samples of different origin, to address the following issues: (i) Is there a correlation between microbial taxa and truffle ground productivity? (ii) Can bacteria actually be used as markers of T. magnatum geographic origin? The identification of microorganisms able to promote T. magnatum formation may represent an important advance in the field of truffle farming. Similarly, the detection of bacterial taxa that can be used as markers of T. magnatum origin could have a considerable impact on truffle industry and trade, even at local scale.
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Affiliation(s)
- Pamela Monaco
- Department of Biosciences and Territory, University of Molise, Pesche, Italy
- *Correspondence: Pamela Monaco,
| | - Gino Naclerio
- Department of Biosciences and Territory, University of Molise, Pesche, Italy
| | - Antonietta Mello
- Institute for Sustainable Plant Protection (IPSP), Turin Unit, National Research Council, Turin, Italy
| | - Antonio Bucci
- Department of Biosciences and Territory, University of Molise, Pesche, Italy
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Fortier D, Séguin JC, Voyer N. Characterization of the Volatilome of Tuber canaliculatum Harvested in Quebec, Canada. ACS OMEGA 2022; 7:29038-29045. [PMID: 36033704 PMCID: PMC9404485 DOI: 10.1021/acsomega.2c02877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 07/22/2022] [Indexed: 06/15/2023]
Abstract
The first detailed characterization of volatile compounds from Tuber canaliculatum, a truffle newly grown in Quebec, Canada, was performed with headspace solid phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC/MS). A total of 30 compounds were identified, making up more than 98% of the volatile extract. The volatilome of T. canaliculatum is dominated by (E)-1-methylthio-1-propene, (Z)-1-methylthio-1-propene, dimethyl disulfide, and 1-octen-3-ol. It also includes six compounds identified for the first time in truffles, namely, 4-hydroxy-4-methyl-2-pentanone, pentyl propanoate, (Z)-1-methyl-2-(prop-1-en-1-yl)disulfide, (E)-1-methyl-2-(prop-1-en-1-yl)disulfide, (Z)-1-methyl-3-(prop-1-en-1-yl)trisulfide, and (E)-1-methyl-3-(prop-1-en-1-yl)trisulfide. With the growing interest in gastronomy in truffles in North America, it is becoming important to gather knowledge for identification purposes and to delineate the key volatile compounds responsible for the aroma of North American truffles, especially the newly harvested T. canaliculatum.
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Phong WN, Al-Salami H, Gibberd MR, Dykes GA, Payne AD, Coorey R. Comparative evaluation of encapsulation using β-cyclodextrin versus freeze-drying for better retention and stabilizing of black Périgord truffle (Tuber melanosporum) aroma. J Food Sci 2022; 87:3482-3495. [PMID: 35788997 PMCID: PMC9541271 DOI: 10.1111/1750-3841.16241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Revised: 05/18/2022] [Accepted: 06/09/2022] [Indexed: 11/30/2022]
Abstract
This study aimed to develop a novel technique to retain and stabilize compounds contributing to truffle aroma by encapsulation using β-cyclodextrin. Two experiments were conducted. In the first experiment, the key volatile profile and microbial population of products resulting from three different encapsulation methods, namely direct mixing method (M1), direct mixing followed by ethanol addition method (M2), and paste method (M3), were compared with untreated truffles (positive control) over a 90-day period. The M2-derived product was the least optimal for retaining key volatile compounds despite showing the lowest microbial population. There was no significant difference in the volatile profile of products derived from M1 and M3 on day 0. However, it was observed that the M3-derived product could retain its volatile profile better than the M1-derived product by day 90. M3 was compared with freeze-drying in the second experiment. Freeze-dried truffles showed an overall higher relative percentage of volatiles than the M3-derived product on day 0. However, by day 90, some volatile changes occurred in the freeze-dried truffles but not in the M3-derived product. The findings indicate that while freeze-drying could adequately conserve truffle volatiles, the encapsulation of volatile compounds in β-cyclodextrin could improve the volatile stability of truffle products and allow for longer storage times. Microbes were found in all encapsulated truffle products and freeze-dried truffles on days 0 and 90, suggesting the need to explore the possibility of incorporating a decontamination step in the process prior to either encapsulation or freeze-drying. PRACTICAL APPLICATION: A technique to capture and stabilize compounds responsible for truffle aroma by encapsulation using β-cyclodextrin was developed and compared with freeze-drying in this study. The overall finding suggests that while freeze-drying of truffle could sufficiently preserve volatiles, encapsulating truffle volatiles with β-cyclodextrin may improve its stability, extending its shelf life, which can be applied in the development of a natural truffle ingredient that can be applied in food product development.
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Affiliation(s)
- Win Nee Phong
- School of Molecular and Life Sciences, Curtin University, Bentley, Australia
| | - Hani Al-Salami
- Biotechnology and Drug Development Research Laboratory, Curtin Health Innovation Research Institute, Curtin Medical School, Curtin University, Bentley, Australia
| | - Mark R Gibberd
- Centre for Crop and Disease Management, School of Molecular and Life Sciences, Curtin University, Bentley, Australia
| | - Gary A Dykes
- School of Agriculture and Food Sciences, University of Queensland, Brisbane, Australia
| | - Alan D Payne
- School of Molecular and Life Sciences, Curtin University, Bentley, Australia
| | - Ranil Coorey
- School of Molecular and Life Sciences, Curtin University, Bentley, Australia
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