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(From AOCS Official Methods)
Section J: Lecithin |
AOCS |
Moisture in Lecithin |
Ja 2a-46 (Status: Reapproved 2024) |
Moisture in Lecithin, Karl Fischer Method |
Ja 2b-87 (Status: Revised 2024) |
Hexane-Insoluble Matter in Vegetable Lecithins |
Ja 3-87 (Status: Reapproved 2024) |
Acetone-Insoluble Matter in Vegetable Lecithins |
Ja 4-46 (Status: Reapproved 2024) |
Phosphorus in Lecithin, Total |
Ja 5-55 (Status: Surplus 1989) |
Acid Value of Vegetable Lecithin |
Ja 6-55 (Status: Reapproved 2024) |
Phospholipids in Lecithin Concentrates by Thin-Layer Chromatography (TLC) |
Ja 7-86 (Status: Reapproved 2024) |
Lecithin phospholipids by HPLC |
Ja 7b-91 (Status: Surplus 2025) |
Peroxide Value of Lecithin |
Ja 8-87 (Status: Reapproved 2024) |
Gardner Color of Lecithin |
Ja 9-87 (Status: Reapproved 2024) |
Brookfield Viscosity of Lecithin |
Ja 10-87 (Status: Reapproved 2024) |
Viscosity of Transparent Liquids by Bubble Time Method |
Ja 11-87 (Status: Reapproved 2024) |
Analysis of Lecithin Co-Products |
Ja 12-89 (Status: Reapproved 2024) |
Tocopherols in Lecithin by HPLC |
Ja 13-91 (Status: Reapproved 2024) |
Iodine Value in Lecithin, Wijs Method |
Ja 14-91 (Status: Reapproved 2024) |
Methods is an important guide and reference for every edible products analytical laboratory. Definition and scope are stated for each method, as well as details for apparatus, reagents, and procedures to be used. Relevant calculations and notes are provided to guide the technician through each procedure. Methods is published as a 1,200-page, one-volume edition, with convenient loose-leaf pages, bound by practical, heavy-duty binders.
To order, contact the AOCS technical department via e-mail at technical@aocs.org or fax your request to AOCS at 1-217-351-8091. You may also call AOCS at 1-217-359-2344 or write to us at: AOCS, P.O. Box 3489, Champaign, IL 61826-3489, USA. The cost of the Official Methods and Recommended Practices of the American Oil Chemists’ Society is $500 each, plus U.S. $20 postage and handling within the U.S., U.S. $95 outside the U.S. Only IL residents should add 7.25% sales tax.
In Europe approved DGF official methods are also used. There may be slight differences in the procedures, but a number of methods is identical. For scientific and commercial purposes the used method should be referred. Below you will find the list with comparable methods.
|
DGF |
AOCS |
Acetone Insoluble |
F-I 5 (21) |
Ja 4-46 (24) |
Toluene Insoluble / Hexane Insoluble |
F-I 4b (68) |
Ja 3-87 (24) |
Moisture KF |
F-I 4 (02) |
Ja 2b-87 (24) |
Acid Value |
F-I 3 (02) |
Ja 6-55 (24) |
Peroxide Value |
F-I 3b (00) |
Ja 8-87 (24) |
Gardner Color |
C-IV 4a (20) |
Ja 9-87 (24) |
Viscosity |
F-I 2 (00) |
Ja 10-87 (24) |
Phosphorus |
F-I 5a (00) |
Ja 5-55 (Surplus 1989) |
Iron |
F-I 4a (98) |
Ca 15-75 (25) |
Iodine Value (Wijs) |
F-I 3a (02) |
Ja 14-91 (24) |
HPTLC |
F-I 6 (99) |
|
HPLC (LSc) |
F-I 6a (07) |
Ja 7c-07 (24) |
Sampling |
F-I 1 (02) |
Ja 12-89 (24) |
1H- and 13C NMR spectra are sensitive for chemical structures, different subgroups of similar chemical surroundings are separated in regions of similar chemical shifts.
Any common fatty acid consists of a terminal methyl group. Saturated and unsaturated fatty acids show different chemical shifts of these methyl groups. The difference in the chemical shift depends on the distance between the terminal methyl group and the position of the next double bond.