AOAC Methods for Review in Codex STAN 234_11-2018

AOAC Official Methods Listed in CXS 234 for Milk and Milk Products

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Length of nozzle . . . . . . . . . . . . . . . . . . . . 15–20mm Delivery time . . . . . . . . . . . . . . . . . . . . . . . . 5–8 s Graduation: For rawmilk. . . . . . . . . . . . . To deliver 17.6mLat 20°C when bottom of meniscus coincides with mark on suction tube For processedmilk . . . . . . . . . To deliver 17.6mLat 38°C when bottom of meniscus coincides with mark on suction tube Maximum error . . . . . . . . . . . . . . . . . . . . £ 0.05 mL Permanent markings on bulb: For raw milk . . . . . . . . . . . . . . . . . . . . . “Sealed,” manufacturer’s No. or name, TD 17.6 mL at 20°C, tolerance 0.05mL, 5–8 s For processed milk . . . . . . . . . . . . . . . . . . . “Sealed,” manufacturer’s No. or name, TD 17.6 mL at 38°C, tolerance 0.05mL, 5–8 s

and 0.5% line is numbered on left above line and these lines extend across flat surface. Smallest graduated line is ³ 2.5 mm. Intermediate graduation line extends 1 ± 0.2 mm equally on both sides of smallest graduated line. ( 4 ) Vertical line .—Vertical line is acid-etched and pigmented on right side of graduated flat tube. This line touches intermediate lines at their extreme right end and extends beyond 0 and 0.5% lines ³ 3 mm. Width of vertical lines £ 0.2 mm. ( 5 ) Error .—Maximum error of total graduation or any part thereof must not exceed volume of smallest unit of graduation (= 0.01 mL). ( b ) Gercock-style pipet for raw and processed milk .—To conform to following specifications: Total length: For rawmilk . . . . . . . . . . . . . . . . . . . . . £ 280mm For processedmilk . . . . . . . . . . . . . . . . . . ³ 280mm Suction tube diameter . . . . . . . . . . . . . . . . 7 ± 0.2mmod Wall thickness . . . . . . . . . . . . . . . . . . . 0.9 ± 0.04mm Suction tube length . . . . . . . . . . . . . . . . . . . . 130mm Delivery tube diameter . . . . . . . . . . . . . . . 5 ± 0.2mmod Distance of graduationmark above bulb . . . . . . . . 15–45mm

Reference: JAOAC 69, 831(1986). Revised: March 2002

ã 2005 AOAC INTERNATIONAL

10/9/2018