Air-Agitation Modification of the AOAC Method for Fly Egg Detection in Tomato Products

1966 ◽  
Vol 49 (5) ◽  
pp. 903-905
Author(s):  
Robert C Riley ◽  
Donald J Prostak
Keyword(s):  
Aoac Method ◽  
Tomato Products

Abstract The present official, first action method for fly eggs and maggots in tomato products, 36.064, was modified by using airagitation in place of hand-rotary shaking. Air-agitation is more efficient than hand swirling both in the number of fly eggs recovered and in the time necessary for analysis.

Determination of Geotrichum Mold in Comminuted Fruits and Vegetables: Collaborative Study

1982 ◽  
Vol 65 (5) ◽  
pp. 1095-1096
Author(s):  
Stanley M Cichowicz ◽  
Ruth Bandler ◽  
◽  
R Bandler ◽  
G Dzidowski ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Fruits And Vegetables ◽  
Collaborative Study ◽  
Green Beans ◽  
Aoac Method ◽  
Tomato Products

Abstract The official AOAC method for determination of Geotrichum mold in canned fruits and vegetables (44.079) requires a series of 3 sieves, Nos. 8, 16, and 230, to separate the packing liquid from the product and the mold from the packing liquid. Although this method has been successful for whole or coarsely chopped products (e.g., green beans, potatoes, carrots, and beets), finely divided products such as fruit purees and tomato products tend to clog the sieves. A method was developed in which the product is centrifuged, diluted by volume, stained with crystal violet, and counted with the sieving steps eliminated. The proposed method was adopted official first action.

Modification of AOAC Method for Determination of Soluble Solids in Tomato Products

1972 ◽  
Vol 55 (4) ◽  
pp. 809-810
Author(s):  
Frank C Lamb
Keyword(s):  
Sample Preparation ◽  
Excellent Agreement ◽  
Soluble Solids ◽  
Official Method ◽  
Aoac Method ◽  
Centrifugation Technique ◽  
Tomato Products ◽  
Good Agreement

Abstract The official first action method for soluble solids in tomato products, 32.008–32.010, was modified to permit the optional use of an ultracentrifuge to prepare samples for readings in a refractometer. Excellent agreement was obtained between the official method which specifies filtration and the centrifugation technique. Good agreement was also obtained between 2 laboratories using the centrifugation technique. The official method was modified to include the optional use of an ultracentrifuge for sample preparation.

Ruggedness Testing of the Official Method for Rot Fragments in Comminuted Tomato Products

1985 ◽  
Vol 68 (5) ◽  
pp. 896-898
Author(s):  
Gerald E Russell
Keyword(s):  
Analysis Of Variance ◽  
Official Method ◽  
Design Technique ◽  
Testing Procedures ◽  
Tube Number ◽  
Sample Amount ◽  
Aoac Method ◽  
Tomato Products ◽  
Ruggedness Testing ◽  
Staining Time

Abstract The official AOAC method for rot fragments in comminuted tomato products (44.224) has been revised on the basis of Youden's ruggedness testing procedures to provide better control over the sources of variability. Two sets of ruggedness tests were carried out to evaluate the type of balance used to weigh the sample, amount of stain, staining time, sieve design, technique used to transfer stained material from beaker to sieve, washing technique used to accumulate stained material at edge of sieve, diameter of eye dropper used to transfer sample from sieve to graduated tube, number of 0.5 mL portions examined, and magnification used to examine prepared slides. A 3-way analysis of variance conducted on amount of stain, transfer technique, and washing technique showed that the transfer and washing techniques were significant areas of variability.

Particle Size and Concentration Adjustments of Tomato Products for Howard Mold Count

1981 ◽  
Vol 64 (3) ◽  
pp. 570-573
Author(s):  
Ruth Bandler ◽  
Stanley M Cichowicz ◽  
◽  
S Cichowicz ◽  
D Floyd ◽  
...  
Keyword(s):  
Particle Size ◽  
Coefficient Of Variation ◽  
Collaborative Study ◽  
Official Method ◽  
Study Results ◽  
Product Standardization ◽  
Aoac Method ◽  
Tomato Products ◽  
Uniform Particle Size ◽  
Mold Count

Abstract The present AOAC method for mold counts of tomato products (44.096) provides no inter-product standardization of concentration among juice, sauce, paste, puree, and catsup; no intra-product standardization of concentration for juice, sauce, and catsup; and no adjustment for degree of comminution. Use of the official method, therefore, could result in an artificially increased mold count for products which have undergone extreme comminution. A new method was developed to adjust all products to the same concentration and grind them to a uniform particle size, thereby ensuring comparable mold counts on products produced by different processes. Collaborative study results showed equal repeatability for both the official and the proposed methods and a lower coefficient of variation for the proposed method.

Enzymatic-Ultraviolet Method for Measuring Lactose in Milk: Collaborative Study

1984 ◽  
Vol 67 (3) ◽  
pp. 637-640 ◽  
Author(s):  
David O Biltcliffe ◽  
Dick H Kleyn ◽  
J Richard Trout ◽  
◽  
D Azzara ◽  
...  
Keyword(s):  
Food Industry ◽  
Collaborative Study ◽  
Skim Milk ◽  
Gravimetric Method ◽  
T Test ◽  
Enzymatic Method ◽  
Commercial Laboratory ◽  
Aoac Method ◽  
Standard Deviations

Abstract Collaborators in 8 dairy and food industry laboratories performed one lactose determination on each of 8 unknown samples of milk, lowfat milk, or skim milk, as 3 pairs of blind duplicates. Two known samples were provided to gain experience prior to analysis of the unknown samples. All of the above samples were also analyzed for lactose content by the official AOAC gravimetric method (16.507) by a commercial laboratory. From the overall mean of results on all samples, determinations by the enzymatic method averaged 0.49% lower than by the AOAC method. This difference was significant by the t-test (P = 0.05), which indicated a lack of agreement between the compared methods in determining lactose content. Standard deviations were similar for the 3 sets of blind duplicates which ranged between 3.67 and 4.55% lactose content. F-values revealed that variations between means obtained by laboratories differed significantly as compared with variations within laboratory means. The method has been adopted official first action.

Relation Between Refractive Index, Specific Gravity, and Total Solids of Tomato Juice, Puree, and Paste

1967 ◽  
Vol 50 (3) ◽  
pp. 690-700
Author(s):  
Frank C Lamb
Keyword(s):  
Refractive Index ◽  
Specific Gravity ◽  
Tomato Juice ◽  
Regression Equations ◽  
Total Solids ◽  
Pectic Enzymes ◽  
Tomato Paste ◽  
Aoac Method ◽  
Solids Content ◽  
Separate Regression

Abstract Total solids by drying, refractive index, and specific gravity were determined on about 375 commercial samples of tomato juice, puree, and paste. Refractive index was determined with and without dilution of tomato paste; pectic enzymes were used to aid filtration and centrifugation. A new specific gravity bottle was used. The new AOAC method for total solids was compared with the former AOAC method on 115 samples. Variations from previous tables relating refractive index and total solids were of little significance up to 20% solids but were increasingly greater as solids increased above 20%. Data obtained in these studies showed lower values for total solids than the old tables in most instances. Separate regression equations had to be calculated for the solids content of the diluted and undiluted samples. Total solids by the official AOAC method was the most precise of the methods used. However, specific gravity and refractive index were both found to have satisfactory degrees of precision

Comparison of Methods for Determining Biuret in Urea

1979 ◽  
Vol 62 (1) ◽  
pp. 153-159
Author(s):  
Luis F Corominas ◽  
Victor M Boy ◽  
Manuel Guijosa
Keyword(s):  
Atomic Absorption ◽  
Spectrophotometric Determination ◽  
Atomic Absorption Spectrophotometry ◽  
International Organization ◽  
Comparison Of Methods ◽  
Definite Advantage ◽  
Absorption Spectrophotometry ◽  
Alternative Procedures ◽  
Aoac Method

Abstract The official first action AOAC method for the spectrophotometric determination of biuret in urea, 2.072—2.074, was compared with official first action AOAC method 2.C01-2.C03 (atomic absorption spectrophotometry), 2 simplified versions of 2.072-2.074, and modified versions of 2 alternative procedures of the International Organization for Standardization. Three synthetic urea samples (0.3, 1.4, and 3.0% biuret) and 1 commercial urea sample (1.0% biuret) were analyzed. The methods proved to be equivalent and none showed a definite advantage over 2.072-2.074. The purification of biuret and the interference by ammonia are also discussed.

scholarly journals An Improved Histamine Assay in Fish by Using an Oxygen Sensor and Its Comparison with the AOAC Method

1996 ◽  
Vol 37 (2) ◽  
pp. 109-113_1 ◽  
Author(s):  
Fumiko NOMURA ◽  
Minoru OHASHI ◽  
Megumi OTSUKA ◽  
Osao ADACHI ◽  
Nobuhiko ARAKAWA
Keyword(s):  
Oxygen Sensor ◽  
Aoac Method
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