NF EN ISO 8292-2
Animal and vegetable fats and oils - Determination of solid fat content by pulsed NMR - Part 2 : indirect method
ISO 8292-2:2008 specifies an indirect method for the determination of the 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 indirect method is less easy to carry out and less reproducible than the direct method, but is more accurate and more universally applicable to all fats.
ISO 8292-2:2008 specifies an indirect method for the determination of the 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 indirect method is less easy to carry out and less reproducible than the direct method, but is more accurate and more universally applicable to all fats.
- 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 termes abrégés2
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5 Principe2
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6 Échantillon étalon de trioléine2
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7 Appareillage2
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8 Échantillonnage4
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9 Mode opératoire4
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9.1 Protocole de mesurage4
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9.2 Four, bains d'eau et blocs régulés en température4
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9.3 Spectromètre RMN4
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9.4 Remplissage des tubes de mesurage6
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9.5 Élimination de l'historique thermique6
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9.6 Équilibrage à la température initiale et mesurage du signal liquide à 100 %6
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9.7 Cristallisation et tempérage6
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9.8 Mesurage de SFC6
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9.9 Nombre de déterminations7
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9.10 Nettoyage des tubes de mesurage7
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10 Expression des résultats8
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11 Fidélité8
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11.1 Essais interlaboratoires8
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11.2 Répétabilité8
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11.3 Reproductibilité8
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12 Rapport d'essai9
- Annexe A (informative) Résultats d'essais interlaboratoires10
- Annexe B (informative) Théorie de la méthode indirecte13
- Annexe C (informative) Protocoles de mesurage supplémentaires15
- Bibliographie17
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