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Spataro F, Rosso F, Peraino A, Arese C, Caligiani A. Key molecular compounds for simultaneous origin discrimination and sensory prediction of cocoa: An UHPLC-HRMS sensomics approach. Food Chem 2024; 463:141201. [PMID: 39288464 DOI: 10.1016/j.foodchem.2024.141201] [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: 03/21/2024] [Revised: 09/05/2024] [Accepted: 09/06/2024] [Indexed: 09/19/2024]
Abstract
Cocoa-based and chocolate mono-origin products are increasingly gaining market share because they are perceived by consumers as more valuable and high quality. A comprehensive characterization of the sensory profile of a specific geographical area is complex and different analytical and sensorial strategies have been adopted. This study focused on identifying molecular markers capable of discriminating between different origins and, at the same time, predicting their sensory attributes adopting a sensomics approach. The aim is to provide a useful tool for chocolate producers to effectively screen the origins of cocoa, controlling and optimizing the gustative properties and processing flow. An untargeted method was adopted, based on the coupling of UHPLC-HRMS, followed by the application of chemometric tools for the selection of 71 discriminating molecular markers for six origins. These markers, via OPLS-Regressions, also demonstrated a strong global correlation with the sensory descriptors, evaluated by trained assessors, allowing their prediction.
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Affiliation(s)
- Francesco Spataro
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy; Soremartec Italia Srl, Ferrero Group, Piazzale Pietro Ferrero 1, 12051 Alba, CN, Italy.
| | - Franco Rosso
- Soremartec Italia Srl, Ferrero Group, Piazzale Pietro Ferrero 1, 12051 Alba, CN, Italy.
| | - Andrea Peraino
- Soremartec Italia Srl, Ferrero Group, Piazzale Pietro Ferrero 1, 12051 Alba, CN, Italy.
| | - Cecilia Arese
- Soremartec Italia Srl, Ferrero Group, Piazzale Pietro Ferrero 1, 12051 Alba, CN, Italy.
| | - Augusta Caligiani
- Food and Drug Department, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy.
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2
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Barkale HV, Dey N. Functionalized cyanostilbene-based nano-AIEgens: multipoint binding interactions for improved sensing of gallic acid in real-life food samples. J Mater Chem B 2024; 12:8746-8756. [PMID: 39140138 DOI: 10.1039/d4tb00905c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
Cyano-substituted stilbene (CSS) derivatives have been synthesized that can form luminescent nanoscopic assemblies in an aqueous medium. The optical properties of such materials, as governed by the relative ratios of their monomer and aggregated forms, are found to be susceptible to pH and temperature of the medium. The compound with boronic acid attached at the terminal positions shows a turn-on fluorescence response (LOD: 15.4 ppb) with gallic acid (GA). The mechanistic studies indicate that the 1,2-diol unit of GA is involved in ester formation with the boronic acid residue, while the carboxylic end engages in hydrogen bonding interaction with the nitrile unit. Such multi-point binding interaction provides better selectivity over other structurally similar analytes. Moreover, the distinct aggregation properties of such boronate ester derivatives are responsible for the GA-specific optical response. The sensory system has been utilized for the determination of the levels of GA derivatives in tea (green tea and black tea) and various fruit (mango, orange, guava, pomegranate) extracts. In all cases, the estimated values of GAE were found to be in the same range reported by others. Finally, low-cost, chemically-modified paper strips have been designed for rapid, on-location detection of GA.
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Affiliation(s)
- Harshal V Barkale
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Hyderabad, Telangana 500078, India.
| | - Nilanjan Dey
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Hyderabad, Telangana 500078, India.
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Chang X, Fang X, Yao Y, Xu Z, Wu C, Lu L. Identification and Characterization of Glycosyltransferases Involved in the Biosynthesis of Neodiosmin. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:4348-4357. [PMID: 38354268 DOI: 10.1021/acs.jafc.3c09308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
Glycosylation plays a very important role in plant secondary metabolic modifications. Neodiosmin, identified as diosmetin-7-O-neohesperidoside, not only acts to mitigate bitterness and enhance the flavor of food but also serves as a pivotal metabolite that reinforces plant immunity. Investigating its biosynthetic pathway in plants is crucial for optimizing fruit quality and fortifying plant immune responses. In this study, through analysis of transcriptomic data from Astilbe chinensis, we identified two novel uridine diphosphate (UDP)-glycosyltransferases (UGTs): Ach14791 (AcUGT73C18), responsible for flavonoid 7-O-glycosylation and Ach15849 (AcUGT79B37), involved in flavonoid-7-O-glucoside-2″-O-rhamnosylation. By delving into enzymatic properties and catalytic promiscuity, we developed a biosynthesis route of neodiosmin by establishing a one-pot enzyme-catalyzed cascade reaction. Simultaneously, lonicerin and rhoifolin were also successfully synthesized using the same one-pot dual-enzyme catalytic reaction. Taken together, our findings not only identified two novel UGTs involved in neodiosmin biosynthesis but also provided important biocatalytic components for the microorganism-based biosynthesis of flavonoid-7-O-disaccharide compounds.
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Affiliation(s)
- Xiaosa Chang
- Department of Integrated Traditional Chinese Medicine and Western Medicine, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Xueting Fang
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Yan Yao
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Zhenni Xu
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Chaoyan Wu
- Department of Integrated Traditional Chinese Medicine and Western Medicine, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Li Lu
- Department of Integrated Traditional Chinese Medicine and Western Medicine, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (Ministry of Education), School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
- Hubei Hongshan Laboratory, Wuhan 430071, China
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4
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Kim DS, Jeong SM, Jo SH, Chanmuang S, Kim SS, Park SM, Yun SH, Han SG, Cho JY, Kang I, Kim HJ. Comparative Analysis of Physicochemical Properties and Storability of a New Citrus Variety, Yellowball, and Its Parent. PLANTS (BASEL, SWITZERLAND) 2023; 12:2863. [PMID: 37571017 PMCID: PMC10421519 DOI: 10.3390/plants12152863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 08/02/2023] [Accepted: 08/02/2023] [Indexed: 08/13/2023]
Abstract
Although numerous citrus varieties have recently been developed to enhance their quality, information on their quality characteristics is limited. We assessed the quality characteristics of Yellowball, a novel citrus variety, by evaluating its appearance, storability, sensory properties, functionality, and metabolite profiles and then comparing these characteristics with those of its parent varieties, Haruka and Kiyomi. The metabolite profiles between the citrus varieties differed significantly, resulting in distinct physicochemical and functional qualities. The storability of Yellowball was significantly increased compared with that of its parent varieties owing to its strong antifungal activity and unique peel morphology, including the stoma and albedo layers. While we did not investigate the volatile compounds, overall functional activities, and detailed characteristics of each metabolite, our data provide valuable insights into the relationship between citrus metabolites, peel morphology, physicochemical properties, and storability, and demonstrate the potential of Yellowball as a promising variety in the citrus industry.
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Affiliation(s)
- Dong-Shin Kim
- Institute of Animal Medicine, Gyeongsang National University, Jinju 52828, Republic of Korea;
| | - Sung-man Jeong
- Division of Applied Life Science (BK21 Four), Gyeongsang National University, Jinju 52828, Republic of Korea; (S.-m.J.); (S.-H.J.)
| | - Seong-Ho Jo
- Division of Applied Life Science (BK21 Four), Gyeongsang National University, Jinju 52828, Republic of Korea; (S.-m.J.); (S.-H.J.)
| | - Saoraya Chanmuang
- Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea;
| | - Sang Suk Kim
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration, Seogwipo 63607, Republic of Korea; (S.S.K.); (S.M.P.); (S.H.Y.); (S.-G.H.)
| | - Suk Man Park
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration, Seogwipo 63607, Republic of Korea; (S.S.K.); (S.M.P.); (S.H.Y.); (S.-G.H.)
| | - Su Hyun Yun
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration, Seogwipo 63607, Republic of Korea; (S.S.K.); (S.M.P.); (S.H.Y.); (S.-G.H.)
| | - Seung-Gab Han
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration, Seogwipo 63607, Republic of Korea; (S.S.K.); (S.M.P.); (S.H.Y.); (S.-G.H.)
| | - Jeong-Yong Cho
- Department of Food Science and Technology, Chonnam National University, Gwangju 61186, Republic of Korea;
| | - Inhae Kang
- Department of Food Science and Nutrition, Jeju National University, Jeju 63243, Republic of Korea;
| | - Hyun-Jin Kim
- Institute of Animal Medicine, Gyeongsang National University, Jinju 52828, Republic of Korea;
- Division of Applied Life Science (BK21 Four), Gyeongsang National University, Jinju 52828, Republic of Korea; (S.-m.J.); (S.-H.J.)
- Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea;
- Department of Food Science and Technology, Gyeongsang National University, Jinju 52828, Republic of Korea
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Liu X, Wang Z, Gmitter FG, Grosser JW, Wang Y. Effects of Different Rootstocks on the Metabolites of Huanglongbing-Affected Sweet Orange Juices Using a Novel Combined Strategy of Untargeted Metabolomics and Machine Learning. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:1246-1257. [PMID: 36606748 DOI: 10.1021/acs.jafc.2c07456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Huanglongbing (HLB) is one of the most destructive citrus diseases, mainly caused by the Gram-negative bacteria Candidatus Liberibacter asiaticus. Aiming at unraveling the mechanisms of different scion/rootstock combinations on improving HLB-affected orange juice quality, the effects of rootstocks on the metabolites of HLB-affected sweet orange juices were investigated using a combined strategy of untargeted metabolomics and machine learning. A total of 2531 ion features were detected using UHPLC-Q-Orbitrap high-resolution electrospray ionization mass spectrometry, and 54 metabolites including amino acids, amines, flavonoids, coumarins, fatty acids, and glycosides were definitely or tentatively identified as the differential markers based on the random forest algorithm. Furthermore, 24 metabolites were verified and semi-quantified using authentic standards. Notably, the presence of specific amino acids and amines, especially polyamines, indicated that different rootstocks might affect glutamate, aspartate, proline, and arginine metabolism to regulate the physiological response against HLB. Meanwhile, the production of flavonoids and prenylated coumarins suggested that rootstocks influenced phenylalanine and phenylpropanoid metabolism. The possible metabolic pathways were proposed, and the important intermediates were verified by authentic standards. These results provide new insights on the effects of rootstocks on the metabolites of HLB-affected sweet orange juices.
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Affiliation(s)
- Xin Liu
- Citrus Research and Education Center, University of Florida, Lake Alfred, Florida 33850, United States
- Department of Food Science and Human Nutrition, University of Florida, Gainesville, Florida 32611, United States
| | - Zhixin Wang
- Citrus Research and Education Center, University of Florida, Lake Alfred, Florida 33850, United States
- Department of Food Science and Human Nutrition, University of Florida, Gainesville, Florida 32611, United States
| | - Frederick G Gmitter
- Citrus Research and Education Center, University of Florida, Lake Alfred, Florida 33850, United States
| | - Jude W Grosser
- Citrus Research and Education Center, University of Florida, Lake Alfred, Florida 33850, United States
| | - Yu Wang
- Citrus Research and Education Center, University of Florida, Lake Alfred, Florida 33850, United States
- Department of Food Science and Human Nutrition, University of Florida, Gainesville, Florida 32611, United States
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Longhi TV, de Carvalho DU, Duin IM, da Cruz MA, Leite Junior RP. Transgenic Sweet Orange Expressing the Sarcotoxin IA Gene Produces High-Quality Fruit and Shows Tolerance to ‘Candidatus Liberibacter asiaticus’. Int J Mol Sci 2022; 23:ijms23169300. [PMID: 36012564 PMCID: PMC9409437 DOI: 10.3390/ijms23169300] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 08/14/2022] [Accepted: 08/15/2022] [Indexed: 12/02/2022] Open
Abstract
Huanglongbing (otherwise known as HLB or greening) is currently the most devastating citrus disease worldwide. HLB is primarily associated with the phloem-inhabiting bacterium ‘Candidatus Liberibacter asiaticus’ (CLas). Currently, there are no citrus species resistant to CLas. Genetic transformation is one of the most effective approaches used to induce resistance against plant diseases. Antimicrobial peptides (AMPs) have shown potential breakthroughs to improve resistance to bacterial diseases in plants. In this paper, we confirm the Agrobacterium-mediated transformation of Pera sweet orange expressing the AMP sarcotoxin IA (stx IA) gene isolated from the flesh fly Sarcophaga peregrina and its reaction to CLas, involving plant performance and fruit quality assessments. Four independent transgenic lines, STX-5, STX-11, STX-12, and STX-13, and a non-transgenic control, were graft-inoculated with CLas. Based on our findings, none of the transgenic plants were immune to CLas. However, the STX-5 and STX-11 lines showed reduced susceptibility to HLB with mild disease symptoms and low incidence of plants with the presence of CLas. Fruit and juice quality were not affected by the genetic transformation. Further, no residues of the sarcotoxin IA protein were found in the juice of the STX-11 and STX-12 fruits, though detected in the juice of the STX-5 and STX-13 lines, as revealed by the immunoblotting test. However, juices from all transgenic lines showed low traces of sarcotoxin IA peptide in its composition. The accumulation of this peptide did not cause any deleterious effects on plants or in fruit/juice. Our findings reinforce the challenges of identifying novel approaches to managing HLB.
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Affiliation(s)
- Talita Vigo Longhi
- Área de Proteção de Plantas, Instituto de Desenvolvimento Rural do Paraná—IAPAR/Emater (IDR-Paraná), Celso Garcia Cid Road, km 375, Londrina 86047-902, PR, Brazil
- Centro de Ciências Agrárias, Universidade Estadual de Londrina (UEL), Celso Garcia Cid Road, km 380, Londrina 86057-970, PR, Brazil
| | - Deived Uilian de Carvalho
- Área de Proteção de Plantas, Instituto de Desenvolvimento Rural do Paraná—IAPAR/Emater (IDR-Paraná), Celso Garcia Cid Road, km 375, Londrina 86047-902, PR, Brazil
- Centro de Ciências Agrárias, Universidade Estadual de Londrina (UEL), Celso Garcia Cid Road, km 380, Londrina 86057-970, PR, Brazil
- Departamento de Pesquisa e Desenvolvimento, Fundo de Defesa da Citricultura (Fundecitrus), 201 Dr. Adhemar Pereira de Barros, Araraquara 14807-040, SP, Brazil
- Correspondence:
| | - Izabela Moura Duin
- Área de Proteção de Plantas, Instituto de Desenvolvimento Rural do Paraná—IAPAR/Emater (IDR-Paraná), Celso Garcia Cid Road, km 375, Londrina 86047-902, PR, Brazil
- Centro de Ciências Agrárias, Universidade Estadual de Londrina (UEL), Celso Garcia Cid Road, km 380, Londrina 86057-970, PR, Brazil
| | - Maria Aparecida da Cruz
- Área de Proteção de Plantas, Instituto de Desenvolvimento Rural do Paraná—IAPAR/Emater (IDR-Paraná), Celso Garcia Cid Road, km 375, Londrina 86047-902, PR, Brazil
- Centro de Ciências Agrárias, Universidade Estadual de Londrina (UEL), Celso Garcia Cid Road, km 380, Londrina 86057-970, PR, Brazil
| | - Rui Pereira Leite Junior
- Área de Proteção de Plantas, Instituto de Desenvolvimento Rural do Paraná—IAPAR/Emater (IDR-Paraná), Celso Garcia Cid Road, km 375, Londrina 86047-902, PR, Brazil
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Liu A, Huang B, Zuo S, Li Z, Zhou JL, Wong WL, Lu YJ. Enzymatic glucosylation of citrus flavonoids to enhance their bioactivity and taste as new food additives. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Li Q, Li T, Baldwin EA, Manthey JA, Plotto A, Zhang Q, Gao W, Bai J, Shan Y. Extraction Method Affects Contents of Flavonoids and Carotenoids in Huanglongbing-Affected "Valencia" Orange Juice. Foods 2021; 10:783. [PMID: 33917278 PMCID: PMC8067400 DOI: 10.3390/foods10040783] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Revised: 03/25/2021] [Accepted: 03/31/2021] [Indexed: 11/20/2022] Open
Abstract
A previous study using healthy "Valencia" orange fruit found that juicing extraction methods dramatically changed the orange juice (OJ) flavor and phytochemical profiles. The present study was conducted to confirm whether the same changes occur when Huanglongbing (HLB)-affected oranges were used. HLB has extensively spread to most OJ processing regions around the world, substantially deteriorating fruit and juice flavor quality and altering the phytochemical profiles. In this study, the effect of two major juice extractor types, a shear force extractor (SFE) and a reamer extractor (RE), on the juice quality and physiochemical profile was assessed using HLB-affected orange fruit. Juice extracted via SFE resulted in a lower yield with lower peel oil and higher pellet (peel tissue particles) content compared to juice obtained via RE. The SFE juice also had higher levels of hesperidin and other flavonoid glycosides, mainly due to plentiful peel tissue particles. The SFE juice was also abundant in carotenoids due to a large amount of flavedo particles in the juice. On the other hand, polymethoxylated flavones occurred at higher concentrations in the RE juice, and this may be due to the higher peel oil content in this juice. The SFE juice was rich in flavonoid glycosides and carotenoids, which are associated with potential antioxidant properties; however, the extra portion of the phytonutrients mostly existed in the pellets and possibly had low bioavailability. The results obtained from the HLB-affected oranges are in agreement with the previous observations of healthy oranges.
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Affiliation(s)
- Qili Li
- Hunan Agricultural Product Processing Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China; (Q.L.); (T.L.); (Q.Z.)
- Hunan Province Key Lab of Fruits & Vegetables Storage, Processing, Quality and Safety, Changsha 410125, China
- Hunan Province International Joint Lab on Fruits & Vegetables Processing, Quality and Safety, Changsha 410125, China
| | - Tao Li
- Hunan Agricultural Product Processing Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China; (Q.L.); (T.L.); (Q.Z.)
- Hunan Province Key Lab of Fruits & Vegetables Storage, Processing, Quality and Safety, Changsha 410125, China
| | - Elizabeth A. Baldwin
- USDA-ARS, Horticultural Research Laboratory, Fort Pierce, FL 34945, USA; (E.A.B.); (J.A.M.); (A.P.)
| | - John A. Manthey
- USDA-ARS, Horticultural Research Laboratory, Fort Pierce, FL 34945, USA; (E.A.B.); (J.A.M.); (A.P.)
| | - Anne Plotto
- USDA-ARS, Horticultural Research Laboratory, Fort Pierce, FL 34945, USA; (E.A.B.); (J.A.M.); (A.P.)
| | - Qun Zhang
- Hunan Agricultural Product Processing Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China; (Q.L.); (T.L.); (Q.Z.)
- Hunan Province Key Lab of Fruits & Vegetables Storage, Processing, Quality and Safety, Changsha 410125, China
- Hunan Province International Joint Lab on Fruits & Vegetables Processing, Quality and Safety, Changsha 410125, China
| | - Wei Gao
- Inspection and Testing Center of Quality and Measurement, Yueyang 414000, China;
| | - Jinhe Bai
- USDA-ARS, Horticultural Research Laboratory, Fort Pierce, FL 34945, USA; (E.A.B.); (J.A.M.); (A.P.)
| | - Yang Shan
- Hunan Agricultural Product Processing Institute, Hunan Academy of Agricultural Sciences, Changsha 410125, China; (Q.L.); (T.L.); (Q.Z.)
- Hunan Province Key Lab of Fruits & Vegetables Storage, Processing, Quality and Safety, Changsha 410125, China
- Hunan Province International Joint Lab on Fruits & Vegetables Processing, Quality and Safety, Changsha 410125, China
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High-temperature oxidation reduces the bitterness of honeybush infusions depending on changes in phenolic composition. Lebensm Wiss Technol 2021. [DOI: 10.1016/j.lwt.2020.110608] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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10
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Cui Y, Allmon SD, Siegel JB. Functional characterization and reclassification of an enzyme previously proposed to be a limonoid UDP-glucosyltransferase. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2020; 100:4870-4878. [PMID: 32483918 PMCID: PMC7920543 DOI: 10.1002/jsfa.10547] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 05/22/2020] [Accepted: 06/01/2020] [Indexed: 05/06/2023]
Abstract
BACKGROUND A major problem in the orange industry is 'delayed' bitterness, which is caused by limonin, a bitter compound developing from its non-bitter precursor limonoate A-ring lactone (LARL) during and after extraction of orange juice. The glucosidation of LARL by limonoid UDP-glucosyltransferase (LGT) to form non-bitter glycosyl-limonin during orange maturation has been demonstrated as a natural way to debitter by preventing the formation of limonin. RESULT Here, the debittering potential of heterogeneously expressed glucosyltransferase, maltose-binding protein (MBP) fused to cuGT from Citrus unishiu Marc (MBP-cuGT), which was previously regarded as LGT, was evaluated. A liquid chromatography - mass spectrometry (LC-MS) method was established to determine the concentration of limonin and its derivatives. The protocols to obtain its potential substrates, LARL and limonoate (limonin with both A and D ring open), were also developed. Surprisingly, MBP-cuGT did not exhibit any detectable effect on limonin degradation when Navel orange juice was used as the substrate; MBP-cuGT was unable to biotransform either LARL or limonoate as purified substrates. However, it was found that MBP-cuGT displayed a broad activity spectrum towards flavonoids, confirming that the enzyme produced was active under the conditions evaluated in vitro. CONCLUSION Our results based on LC-MS demonstrated that cuGT functionality was incorrectly identified. Its active substrates, including various flavonoids but not limonoids, highlight the need for further efforts to identify the enzyme responsible for LGT activity to develop biotechnology-based approaches for producing orange juice from varietals that traditionally have a delayed bitterness. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Youtian Cui
- Department of Chemistry, University of California Davis, One Shields Avenue, Davis, California 95616, United States
| | - Steven D. Allmon
- The Coca-Cola Company, Innovation Center @ Apopka, 2651 Orange Ave, Apopka, Florida 32703, United States
| | - Justin B. Siegel
- Department of Chemistry, University of California Davis, One Shields Avenue, Davis, California 95616, United States
- Department Biochemistry & Molecular Medicine and the Genome Center, University of California Davis, One Shields Avenue, Davis, California 95616, United States
- Corresponding Author: (J.B.S.)
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