Articles

Nuclear magnetic resonance-based approach to fruit characterisation: the case studies of kiwifruits and peaches

nmr-sMany analytical methods have been used to control the quality, authenticity and origin of fresh fruit. NMR methodologies yield a comprehensive metabolic profile, provide direct structural information regarding individual metabolites in the mixture and also give information regarding the water state in the tissue. This is useful in discriminating various fruits varieties, in investigating nutritional properties, in monitoring the development of the fruit and in assessing the optimum harvesting time.

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Qualitative and quantitative assessment of acetylated wood using infrared spectroscopic methods and multivariate data analysis

Chemical modification of wood by methods such as acetylation is required to improve characteristics such as photosensitivity and combustibility, and to provide harmonisation of wood properties in order to avoid swelling and shrinking and to improve bio­degradability. The authors describe the use of mid and near infrared spectroscopies to monitor chemical changes due to acetylation is described. Chemical modification of wood by methods such as acetylation is required to improve characteristics such as photosensitivity and combustibility, and to provide harmonisation of wood properties in order to avoid swelling and shrinking and to improve bio­degradability. The authors describe the use of mid and near infrared spectroscopies to monitor chemical changes due to acetylation is described.

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Pyrolysis, spectroscopy and extraterrestrial organic matter

Space-25-1-F4-sThis article shows that pyrolysis techniques, in combination with spectroscopy, are helping our understanding of how the organic matter in our solar system came to be. Fascinatingly, they also show how secondary processing of meteorite materials seems to enhance the abilities of atmospheres to host life on planetary surfaces as well as providing the raw materials from which life could originate.

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G-SIMS—a powerful method for simplifying and interpretation of complex secondary ion mass spectra

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SIMS-24-6-F1-sA complication and barrier to wider uptake of SIMS, especially for organic materials, is the complexity of the mass spectrum. The G-SIMS method (from gentle-SIMS) was developed to simplify the spectra and provide direct interpretation based on the physics and chemistry of the SIMS process rather than on statistical analysis techniques such as principal component analysis or library matching methods.

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Proton transfer reaction mass spectrometry

MS-24-6-F3-sThere are many reasons for quantifying VOCs in air, from investigating pollution to diagnosis of diseases in humans. PTR-MS has many advantages for this, not least in speed and ability to provide an online analysis. It is a relatively young technique, but has a range of applications from botany and medicine through to industrial process monitoring, security screening, environmental analysis and food science.

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