Table of Contents Table of Contents
Previous Page  85 / 258 Next Page
Information
Show Menu
Previous Page 85 / 258 Next Page
Page Background

B

olong

et al

.:

J

ournal of

AOAC I

nternational

V

ol

.

99, N

o

.

1, 2016 

203

In routine testing, desalted whey powder D90 has been

found to have the lowest chloride content. Data from routine

testing of this product type, with sample identity blinded, are

shown in Table 6. Precision across the three samples meets the

reproducibility requirement, validating the LOQ in the range

27.8 to 29.5 mg/100 g. The validated LOQ does not meet the

SMPR requirement of ≤5 mg/100 g, but this cannot be tested

without appropriately low samples.

Analytical Range

Commercial table salt can be used to test the upper limit

of the analytical range of the potentiometric titration method,

demonstrating an upper limit of 99.0 to 99.5% (data not shown).

In routine testing, however, the matrix with the highest observed

chloride content is skim milk powder. Data from routine testing

of skimmilk powder, with sample identity blinded, are presented

in Table 7. The practical analytical range based on real-world

samples is 28.5 to 1080 mg/100 g on an “as is” basis (although

the practical upper analytical range is likely much higher) and

meets the requirement of SMPR 2014.015 of 5 mg/100 g to

500 mg/100 g in ready-to-feed or reconstituted basis.

Conclusions

The data presented from this single-laboratory validation

study demonstrate that the method meets the criteria outlined in

SMPR 2014.015 and supports First Action status of the method.

References

(1)

Official Methods of Analysis

(2012) 19th Ed., AOAC

INTERNATIONAL, Gaithersburg, Rockville MD, AOAC

SMPR 2014.015

, www.eoma.aoac.org

(2) GB 5413.24-2010, National Food Safety Standard

Determination of Chlorine in Foods for Infants and Young

Children, Milk and Milk Products,

http://www.moh.gov.cn/ zwgkzt/psp/201005/47460.shtml

(3) GB/T 6682-2008, Water for Analytical Laboratory Use—

Specification and Test Methods

, http://www.sac.gov.cn/ SACSearch/search?channelid=97779&templet=gjcxjg_detail. jsp&searchword=STANDARD_CODE=%27GB/T%206682- 2008%27&XZ=T

(4) GB/T 601-2002, Chemical Reagent—Preparations of

Standard Volumetric Solutions,

http://www.sac.gov.cn/ SACSearch/search?channelid=97779&templet=gjcxjg_detail. jsp&searchword=STANDARD_CODE=%27GB/T% 20601-2002%27&XZ=T.

Table 6. LOQ determination using desalted whey powder

Sample No.

Average result, mg/100 g Reproducibility (RSD), %

1

27.8

2

28.2

3.1

3

29.5

Table 7. Skim milk powder data

Sample No.

Average result, mg/100 g Reproducibility (RSD), %

1

1070

2

1080

3.0

3

1020

85