Distribution statistique des teneurs en eau entre les grains de café, incidence sur la repetabilitè de la methode de reference pratique de dosage de l'eau
An oven0drying method has been developed for drying individual coffee beans. A population of 30 beans was accordingly submitted to time and temperature conditions ensuring an average weight loss corresponding to the mean weight loss observed by applying the normalized reference method. Standard error calculation showed that water content of a single coffee bean can be accordingly determined at an accuracy of ¦0.07 (absolute deviation). The statistical study showed a Gaussian distribution of water contents with variation coefficients between 2 and 5. Chemical determination measures an average value on a population of coffee beans. Standard deviation "sd" is accordingly bound to the specific deviation "sg" of each bean and related to the number of beans "n" in the sample by the relation: sd = sg{pound}n. From these considerations, recommendations will be issued for applying reference method by stating minimal number of coffee beans in the sample and by proposing improvements in handling
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
Paris (Francia)
1979
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| Subjects: | BIOQUIMICA, CONTENIDO DE HUMEDAD, SECADO, CONTENIDO DE AGUA, |
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| Summary: | An oven0drying method has been developed for drying individual coffee beans. A population of 30 beans was accordingly submitted to time and temperature conditions ensuring an average weight loss corresponding to the mean weight loss observed by applying the normalized reference method. Standard error calculation showed that water content of a single coffee bean can be accordingly determined at an accuracy of ¦0.07 (absolute deviation). The statistical study showed a Gaussian distribution of water contents with variation coefficients between 2 and 5. Chemical determination measures an average value on a population of coffee beans. Standard deviation "sd" is accordingly bound to the specific deviation "sg" of each bean and related to the number of beans "n" in the sample by the relation: sd = sg{pound}n. From these considerations, recommendations will be issued for applying reference method by stating minimal number of coffee beans in the sample and by proposing improvements in handling |
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