Detection of mandarin in orange juice by single-nucleotide polymorphism qPCR assay.
Identifieur interne : 000B43 ( Main/Merge ); précédent : 000B42; suivant : 000B44Detection of mandarin in orange juice by single-nucleotide polymorphism qPCR assay.
Auteurs : Miriam Aldeguer [Espagne] ; María L Pez-Andreo ; José A. Gabald N ; Antonio PuyetSource :
- Food chemistry [ 0308-8146 ] ; 2014.
Descripteurs français
- Wicri :
- geographic : Espagne.
English descriptors
- KwdEn :
- Beverages (analysis), Citrus (chemistry), Citrus (genetics), Citrus (metabolism), Citrus sinensis (chemistry), Crosses, Genetic, DNA Copy Number Variations, DNA Probes (analysis), DNA Probes (chemistry), DNA Probes (metabolism), DNA, Intergenic (analysis), DNA, Intergenic (chemistry), DNA, Intergenic (metabolism), DNA, Plant (analysis), DNA, Plant (chemistry), DNA, Plant (metabolism), Fluorescent Dyes (chemistry), Food Contamination, Food Handling, Food Inspection (methods), Food Labeling, Food Quality, Fruit (chemistry), Fruit (genetics), Fruit (metabolism), Limit of Detection, Polymorphism, Single Nucleotide, Real-Time Polymerase Chain Reaction, Rhodamines (chemistry), Spain, Species Specificity.
- MESH :
- chemical , analysis : DNA Probes, DNA, Intergenic, DNA, Plant.
- geographic : Spain.
- analysis : Beverages.
- chemistry : Citrus, Citrus sinensis, DNA Probes, DNA, Intergenic, DNA, Plant, Fluorescent Dyes, Fruit, Rhodamines.
- genetics : Citrus, Fruit.
- metabolism : Citrus, DNA Probes, DNA, Intergenic, DNA, Plant, Fruit.
- methods : Food Inspection.
- Crosses, Genetic, DNA Copy Number Variations, Food Contamination, Food Handling, Food Labeling, Food Quality, Limit of Detection, Polymorphism, Single Nucleotide, Real-Time Polymerase Chain Reaction, Species Specificity.
Abstract
A dual-probe real time PCR (qPCR) DNA-based analysis was devised for the identification of mandarin in orange juice. A single nucleotide polymorphism at the trnL-trnF intergenic region of the chloroplast chromosome was confirmed in nine orange (Citrus sinensis) and thirteen commercial varieties of mandarin, including Citrus reticulata and Citrus unshiu species and a mandarin × tangelo hybrid. Two short minor-groove binding fluorescent probes targeting the polymorphic sequence were used in the dual-probe qPCR, which allowed the detection of both species in single-tube reactions. The similarity of PCR efficiencies allowed a simple estimation of the ratio mandarin/orange in the juice samples, which correlated to the measured difference of threshold cycle values for both probes. The limit of detection of the assay was 5% of mandarin in orange juice, both when the juice was freshly prepared (not from concentrate) or reconstituted from concentrate, which would allow the detection of fraudulently added mandarin juice. The possible use of the dual-probe system for quantitative measurements was also tested on fruit juice mixtures. qPCR data obtained from samples containing equal amounts of mandarin and orange juice revealed that the mandarin target copy number was approximately 2.6-fold higher than in orange juice. The use of a matrix-adapted control as calibrator to compensate the resulting C(T) bias allowed accurate quantitative measurements to be obtained.
DOI: 10.1016/j.foodchem.2013.09.002
PubMed: 24128588
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pubmed:24128588Le document en format XML
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<term>Citrus (genetics)</term>
<term>Citrus (metabolism)</term>
<term>Citrus sinensis (chemistry)</term>
<term>Crosses, Genetic</term>
<term>DNA Copy Number Variations</term>
<term>DNA Probes (analysis)</term>
<term>DNA Probes (chemistry)</term>
<term>DNA Probes (metabolism)</term>
<term>DNA, Intergenic (analysis)</term>
<term>DNA, Intergenic (chemistry)</term>
<term>DNA, Intergenic (metabolism)</term>
<term>DNA, Plant (analysis)</term>
<term>DNA, Plant (chemistry)</term>
<term>DNA, Plant (metabolism)</term>
<term>Fluorescent Dyes (chemistry)</term>
<term>Food Contamination</term>
<term>Food Handling</term>
<term>Food Inspection (methods)</term>
<term>Food Labeling</term>
<term>Food Quality</term>
<term>Fruit (chemistry)</term>
<term>Fruit (genetics)</term>
<term>Fruit (metabolism)</term>
<term>Limit of Detection</term>
<term>Polymorphism, Single Nucleotide</term>
<term>Real-Time Polymerase Chain Reaction</term>
<term>Rhodamines (chemistry)</term>
<term>Spain</term>
<term>Species Specificity</term>
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<term>Fluorescent Dyes</term>
<term>Fruit</term>
<term>Rhodamines</term>
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<term>Fruit</term>
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<term>DNA, Intergenic</term>
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<keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Food Inspection</term>
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<keywords scheme="MESH" xml:lang="en"><term>Crosses, Genetic</term>
<term>DNA Copy Number Variations</term>
<term>Food Contamination</term>
<term>Food Handling</term>
<term>Food Labeling</term>
<term>Food Quality</term>
<term>Limit of Detection</term>
<term>Polymorphism, Single Nucleotide</term>
<term>Real-Time Polymerase Chain Reaction</term>
<term>Species Specificity</term>
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<front><div type="abstract" xml:lang="en">A dual-probe real time PCR (qPCR) DNA-based analysis was devised for the identification of mandarin in orange juice. A single nucleotide polymorphism at the trnL-trnF intergenic region of the chloroplast chromosome was confirmed in nine orange (Citrus sinensis) and thirteen commercial varieties of mandarin, including Citrus reticulata and Citrus unshiu species and a mandarin × tangelo hybrid. Two short minor-groove binding fluorescent probes targeting the polymorphic sequence were used in the dual-probe qPCR, which allowed the detection of both species in single-tube reactions. The similarity of PCR efficiencies allowed a simple estimation of the ratio mandarin/orange in the juice samples, which correlated to the measured difference of threshold cycle values for both probes. The limit of detection of the assay was 5% of mandarin in orange juice, both when the juice was freshly prepared (not from concentrate) or reconstituted from concentrate, which would allow the detection of fraudulently added mandarin juice. The possible use of the dual-probe system for quantitative measurements was also tested on fruit juice mixtures. qPCR data obtained from samples containing equal amounts of mandarin and orange juice revealed that the mandarin target copy number was approximately 2.6-fold higher than in orange juice. The use of a matrix-adapted control as calibrator to compensate the resulting C(T) bias allowed accurate quantitative measurements to be obtained.</div>
</front>
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