Determination of low levels of cationic polyelectrolytes in water

1987 ◽  
Vol 59 (10) ◽  
pp. 1444-1445 ◽  
Author(s):  
Dennis P. Parazak ◽  
Charles W. Burkhardt ◽  
Kevin J. McCarthy
Keyword(s):  
Low Levels ◽  
Cationic Polyelectrolytes

Spectrophotometric Determination of Raceophenidol in Feed at Very Low Levels

1968 ◽  
Vol 51 (4) ◽  
pp. 752-755
Author(s):  
Edward L Pratt ◽  
Morris E Auerbach
Keyword(s):  
Spectrophotometric Determination ◽  
Growth Promotion ◽  
Ultraviolet Spectrum ◽  
Average Value ◽  
Collaborative Studies ◽  
Low Levels ◽  
Concentration Levels

Abstract Raceophenidol in feed at concentration levels intended for growth promotion of poultry can be estimated by a curvature inversion measurement related to the ultraviolet spectrum of derived p-methylsulfonylbenzaldehyde. The drug can be accurately measured at the 0.0005% level. Collaborative studies on the method showed an average value of 94 ± 10% of claim. The method is recommended for adoption as official, first action.

Determination of low levels of bromide in fresh water after chromatographic enrichment

Talanta ◽  
1984 ◽  
Vol 31 (1) ◽  
pp. 45-48 ◽  
Author(s):  
Ulla Lundström ◽  
Åke Olin ◽  
Folke Nydahl
Keyword(s):  
Fresh Water ◽  
Low Levels

Determination of Ochratoxin A in Feed by Immunoaffinity Cleanup and Liquid Chromatography

2013 ◽  
Vol 96 (3) ◽  
pp. 599-602 ◽  
Author(s):  
Ping Ding ◽  
Ziyou Mi ◽  
Yali Hou ◽  
Yigang He ◽  
Jianhua Xie
Keyword(s):  
Liquid Chromatography ◽  
Detection Limit ◽  
Ochratoxin A ◽  
Cyanogen Bromide ◽  
Polyclonal Antibodies ◽  
Immunoaffinity Column ◽  
Low Levels ◽  
Sepharose 4B ◽  
Feed Samples

Abstract A method using LC was developed for determination of ochratoxin A (OTA) in feeds. The extracted samples were cleaned up by an immunoaffinity column prepared by covalently coupling polyclonal antibodies against OTA to cyanogen bromide-activated Sepharose 4B. The eluates were determined by LC with fluorescence detection. Recoveries of OTA from fortified samples of 1–10 μg/kg levels ranged from 84.3 to 90.0%, with CVs of 3.3–7.8%. The detection limit was 0.045 μg/kg based on an S/N of 3:1. A total of 65 feed samples were screened for OTA with the proposed method. The results showed that only nine samples were contaminated with OTAs at low levels. The presented method was successfully applied to quantify OTAs in real feed samples.

STUDIES ON FOLIC ACID IN INFANCY

PEDIATRICS ◽  
1964 ◽  
Vol 33 (5) ◽  
pp. 694-699
Author(s):  
Yehuda Matoth ◽  
Rina Zamir ◽  
Shulamith Bar-Shani ◽  
Nathan Grossowicz
Keyword(s):  
Bone Marrow ◽  
Folic Acid ◽  
Folinic Acid ◽  
Whole Blood ◽  
Blood Picture ◽  
Normal Range ◽  
Acid Status ◽  
Effect Of Treatment ◽  
Low Levels

Folic acid was assayed microbiologically in whole blood in a group of infants hospitalized for diarrhea, various infections, and malnutrition. Folic acid activity was decreased in the majority of cases. In some of the infants very low levels were observed. The value of the determination of folic acid in whole blood as a sensitive index of the folic acid status of an individual was confirmed by parallel observations on bone marrow morphology and the level of folic acid in serum. Folinic acid levels were within the normal range in most cases. Low folinic acid levels were common only when folic acid was extremely low. Many patients with low folic acid levels were not anemic, or mildly anemic. In the anemic patients a hypochromic microcytic blood picture was the rule. The effect of treatment with folic acid on the general condition of the patients was more striking than the hematological response.

Determination of multi-element concentrations at ultra-low levels in alternating magnetite and pyrite by HR-ICP-MS using matrix removal and preconcentration

2016 ◽  
Vol 127 ◽  
pp. 237-246 ◽  
Author(s):  
Wenjun Li ◽  
Changle Wang ◽  
Bingyu Gao ◽  
Yating Wang ◽  
Xindi Jin ◽  
...  
Keyword(s):  
Element Concentrations ◽  
Icp Ms ◽  
Matrix Removal ◽  
Low Levels

Microbiological Quality of Commercial Tofu

1984 ◽  
Vol 47 (3) ◽  
pp. 177-181 ◽  
Author(s):  
T. G. REHBERGER ◽  
L. A. WILSON ◽  
B. A. GLATZ
Keyword(s):  
Microbiological Quality ◽  
Plate Count ◽  
Microbial Counts ◽  
Colony Forming Units ◽  
Low Levels ◽  
Microbial Groups ◽  
Yeasts And Molds ◽  
Processing Techniques

A study was done to investigate the microbiological quality of commercial tofu available in local retail outlets. A sampling method was first developed to obtain accurate and representative microbial counts of individual pieces of tofu. Plate count determination of total aerobic organisms, psychrotrophs, coliforms, sporeformers, yeasts and molds, and staphylococci were made on 60 tofu samples (representing three lots each of four different brands) obtained within 24 h after delivery to the retail store. In addition, for two brands that provided manufacturer's pull dates, the same microbial counts were obtained for samples stored in the laboratory at 10°C until the pull date. Of the tofu sampled immediately after purchase, 83% of the lots tested had total counts greater than 106 colony-forming units (CFU)/g and psychrotrophic counts greater than 104 CFU/g. In addition, 67% of the lots tested had confirmed coliform counts greater than 103 CFU/g. Very low levels (less than 10 CFU/g) of all other microbial groups tested for were found in the majority of lots. Samples held until the manufacturer's pull date contained higher total and psychrotrophic counts but lower or stable counts of other organisms compared with samples tested immediately after purchase. To improve the microbiological quality of tofu, processors need to reduce initial loads by improving sanitation and processing techniques, and retailers should provide more consistent and colder refrigerated storage.

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