NF EN ISO 8292-1
Animal and vegetable fats and oils - Determination of solid fat content by pulsed NMR - Part 1 : direct method
ISO 8292-1:2008 specifies a direct method for the determination of solid fat content in animal and vegetable fats and oils (hereafter designated "fats") using low-resolution pulsed nuclear magnetic resonance spectrometry. Two alternative thermal pre-treatments are specified: one for general purpose fats not exhibiting pronounced polymorphism and which stabilize mainly in the β'-polymorph; and one for fats similar to cocoa butter which exhibit pronounced polymorphism and stabilize in the β-polymorph. Additional thermal pre-treatments, which may be more suitable for specific purposes, are given in an informative annex. The direct method is easy to carry out and is reproducible, but is not as accurate as the indirect method due to the approximate method of calculation.
ISO 8292-1:2008 specifies a direct method for the determination of solid fat content in animal and vegetable fats and oils (hereafter designated "fats") using low-resolution pulsed nuclear magnetic resonance spectrometry.
Two alternative thermal pre-treatments are specified: one for general purpose fats not exhibiting pronounced polymorphism and which stabilize mainly in the β'-polymorph; and one for fats similar to cocoa butter which exhibit pronounced polymorphism and stabilize in the β-polymorph. Additional thermal pre-treatments, which may be more suitable for specific purposes, are given in an informative annex.
The direct method is easy to carry out and is reproducible, but is not as accurate as the indirect method due to the approximate method of calculation.
- Avant-proposiv
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1 Domaine d'application1
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2 Références normatives1
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3 Termes et définitions1
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4 Symboles et abréviations2
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5 Principe3
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6 Appareillage3
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6.1 Spectromètre de résonance magnétique nucléaire (RMN) pulsé, basse résolution3
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6.2 Tubes4
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6.3 Matériel de régulation de température4
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6.4 Four, avec ventilateur5
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6.5 Minuteur de laboratoire5
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7 Échantillonnage5
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8 Mode opératoire5
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8.1 Protocole de mesurage5
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8.2 Four, bains d'eau et blocs régulés en température7
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8.3 Détermination du facteur de conversion (si nécessaire)7
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8.4 Spectromètre RMN8
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8.5 Remplissage des tubes de mesurage8
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8.6 Élimination de l'historique thermique8
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8.7 Équilibrage à la température initiale9
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8.8 Cristallisation et tempérage9
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8.9 Mesurage de SFC9
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8.10 Nombre de déterminations10
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8.11 Nettoyage des tubes de mesurage10
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9 Expression des résultats10
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10 Fidélité11
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10.1 Essais interlaboratoires11
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10.2 Répétabilité11
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10.3 Reproductibilité11
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11 Rapport d'essai12
- Annexe A (informative) Résultats d'essais interlaboratoires13
- Annexe B (informative) Théorie de la méthode directe24
- Annexe C (informative) Protocoles de mesurage supplémentaires26
- Bibliographie28
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