Nondestructive quality evaluation of fresh prunes by NMR spectroscopy

Zion, Boaz; Chen, Pictiaw; McCarthy, Michael J.

doi:10.1002/jsfa.2740670402

Cited by 23 publications

(6 citation statements)

References 11 publications

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“…Interference from localised Ðeld gradients in two-dimensional data collection is avoided by analysing the spectral characteristics of the whole fruit. Use of surface coils to generate homogeneous magnetic Ðelds in particular regions of the sample and analysing the sugar/water ratio of their respective spectral peaks (Zion et al 1995), or using the strong relationship between self-di †usion and sucrose concentration in aqueous solution (Wai et al 1995), are the more successful approaches currently being evaluated.…”

Section: Discussionmentioning

confidence: 99%

“…To date, there has been no concerted attempt to link changes in MR parameters obtained from quantitative images to variation in other physicochemical properties, like carbohydrate composition, which would be expected to a †ect the magnetic characteristics of cell solutions. Di †erence in soluble solids content (SSC), for example, is currently being explored as the basis for an MR sensor to assess sweetness of fruit (Zion et al 1995).…”

Section: Introductionmentioning

confidence: 99%

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Quantitative nmr imaging of kiwifruit (actinidia deliciosa) during growth and ripening

Clark¹,

Drummond

MacFall

1998

J. Sci. Food Agric.

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Quantitative 1H magnetic resonance (MR) imaging was used to determine relaxation changes (T1, T2‐CPMG) at regular intervals during growth and ripening of kiwifruit (Actinidia deliciosa var deliciosa). Temporal trends and differences between flesh, locule and core tissue were found for both relaxation parameters. However, no consistent associations were found between non‐destructive measurements and those for individual free sugars, soluble solids content (SSC) and macronutrients and micronutrients determined on dissected companion samples. Increases of 200% in total free sugar concentration in flesh and 68% in SSC accompanied starch hydrolysis after harvest. Despite the magnitude of these changes, relaxation times remained unaltered. These observations were repeated in a second investigation using A arguta fruit and T1, T2, T2‐CPMG and self‐diffusion image contrasts. Here, SSC increased 125% during a compressed 15‐day ripening period, while MR parameters like self‐diffusion declined only 7–14% from harvest values. T2‐CPMG relaxation was also investigated in aqueous solutions containing individual organic acids, sugars or pectate and juice from ripening fruit (4·7–15·5% SSC). Analysis of solutions and juices showed relaxation is indeed sensitive to increases in sugar composition but relatively insensitive to changes in organic acids and soluble pectin at concentrations normally found in fruit. Results imply that relaxation parameters determined from MR images may not be appreciably influenced by processes that cause solution composition to vary dramatically, even though these changes are reflected in the relaxation properties of the juice itself. Possible reasons for this are discussed with regard to the impact of cell structure and magnetic field strength on relaxation processes. © 1998 Society of Chemical Industry.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantitative nmr imaging of kiwifruit (actinidia deliciosa) during growth and ripening

Clark¹,

Drummond

MacFall

1998

J. Sci. Food Agric.

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“…Clark & Burmeister (1999) utilizaram a MRI para identificar injúrias em maçãs, causadas por altas concentrações de CO2 durante o armazenamento sob condições de atmosfera controlada. Vários autores vêm utilizando a tomografia de ressonância magnética, como método não destrutivo, a fim de avaliar a qualidade de frutas frescas (Zion, et al, 1995;Hall et al, 1998;Biscegli et al, 2000;Gonzales et al, 2001). Chen et al (1996) e Clark et al (1999 utilizaram a MRI para acompanhar o desenvolvimento em frutas, através de medidas quantitativas fornecidas pelas imagens.…”

Section: Introductionunclassified

Aplicações da tomografia de ressonância magnética nuclear como método não-destrutivo para avaliar os efeitos de injúrias mecânicas em goiabas 'Paluma' e 'Pedro Sato'

2002

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H). Para cada fruto, foram obtidos tomogramas simétricos a partir do centro do fruto. A tomografia de ressonância magnética nuclear mostrou-se uma ferramenta eficaz na detecção de injúrias internas de frutos. O estresse físico causado pelo impacto produziu um colapso interno nos lóculos desses frutos (internal bruising), levando à perda da integridade celular e a conseqüente liquefação dos tecidos placentários. A cultivar Pedro Sato mostrou uma suscetibilidade maior à injúria por impacto que a 'Paluma'. A injúria por compressão tornou-se mais evidente no pericarpo externo do fruto, de ambas as cultivares. A injúria por corte levou a lignificação dos tecidos no local injuriado e deformações superficiais devido à perda acentuada de matéria fresca no local da lesão, evidentes no sexto dia de avaliação. Termos para indexação: Psidium guajava, pós-colheita, injúrias mecânicas, tomografia, ressonância magnética nuclear, injúria interna. APPLICATIONS OF THE NUCLEAR MAGNETIC RESONANCE TOMOGRAPHY AS A NON-DESTRUCTIVE METHOD TO EVALUATE THE EFFECTS OF MECHANICAL INJURIES IN 'PALUMA' AND 'PEDRO SATO' GUAVASABSTRACT -The present study reports on the potential of the use of the tomography of magnetic resonance, as a non-destructive method, to evaluate the effects of the mechanical injuries in guava fruits. Fruits were harvested at mature stage of Paluma and Pedro Sato cultivars. In impact injury, fruits were allowed to fall freely from a height of 1.2 m, subjecting them to two impacts on opposites sides of the equatorial portion of the fruit. In compression injury, fruits were submitted to a weight of 29.4 N for 15 min. For the cut injury, two longitudinal cuts were made, 30 mm in length and 2 mm deep. Fruits were stored under ambient conditions (22±2 °C, 40 % RH). Magnetic resonance images (MRI) of intact guava were acquired using the Varian 2 Tesla tomography. Images were obtained from the hydrogen (H

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“…1999. unique parameters relating to mobile water fractions determined in NMR experiments, ought to be sensitive to changes in solution properties such as viscosity and composition (Bloembergen et al, 1948;Carver and Richards, 1972). Indeed, NMR analysis is the basis of one approach for nondestructive testing for soluble solids (Zion et al, 1995). And secondly, investigations of ripening fruit (Goodman et al, 1996;Ishida et al, 1994) and soybean nodules (MacFall et al, 1992) have shown that relaxation properties change with time, and with imposition of experimental treatments affecting specific biochemical reactions.…”

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confidence: 99%

Quantitative Magnetic Resonance Imaging of Satsuma Mandarin Fruit during Growth

Clark¹,

Richardson²,

Marsh³

1999

HortSci

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Whole-fruit proton magnetic resonance (MR) imaging was performed on satsuma mandarin (Citrus unshiu Markovich cv. Miho Wase) during a 15-week period commencing 10 weeks after anthesis and continuing to maturity, and at 6 weeks after anthesis the following season. Images with long repetition times (>1600 ms) and short echo times (20 ms) provided the clearest details of anatomical changes in the peel (flavedo, albedo) and vascular system, while those with similar repetition times but longer echo times (120 ms) were best for viewing juice sac morphology within pulp segments. At 6 weeks after anthesis, images of fruits of slightly different physiological ages highlighted rapid changes in the vascular bundles and albedo tissue at this stage of development. Variation in the relaxation measurements, T1 and T2, was determined from quantitative MR images of the juice sacs in equatorial slices, and images of expressed juice from whole fruit. Seasonal measurements of T1 determined in situ (1760 ms) were significantly greater than those in juice (1413 ms). By contrast, there was no mean seasonal difference between in situ T2 measurements (360 ms) and those for juice (332 ms). No associations between trends in the MR data and total soluble solids, pH, titratable acidity, and sugar and organic acid composition of the juice were established. Cell structure is identified as a hindrance in the use of quantitative MR imaging for probing compositional changes in solution in serial imaging studies.

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Nondestructive quality evaluation of fresh prunes by NMR spectroscopy

Cited by 23 publications

References 11 publications

Quantitative nmr imaging of kiwifruit (actinidia deliciosa) during growth and ripening

Quantitative nmr imaging of kiwifruit (actinidia deliciosa) during growth and ripening

Aplicações da tomografia de ressonância magnética nuclear como método não-destrutivo para avaliar os efeitos de injúrias mecânicas em goiabas 'Paluma' e 'Pedro Sato'

Quantitative Magnetic Resonance Imaging of Satsuma Mandarin Fruit during Growth

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