Andries J. Speek

MILD VITAMIN A DEFICIENCY AND RISK OF RESPIRATORY TRACT DISEASES AND DIARRHEA IN PRESCHOOL AND SCHOOL CHILDREN IN NORTHEASTERN THAILAND

Martin W. Bloem, Michel Wedel, ROBERT J. EGGER et al. · American Journal of Epidemiology · 1990 · 169 citations

Vitamin Nutrition, Nutrition, Intervention Trial +12

Total carotenoid and β-carotene contents of Thai vegetables and the effect of processing

Andries J. Speek · Food Chemistry · 1988 · 86 citations

Food Chemistry, Nutrition, Carotenoid +10

Fluorometric determination of total vitamin C and total isovitamin C in foodstuffs and beverages by high-performance liquid chromatography with precolumn derivatization

Andries J. Speek, J. Schrijver, Wil H.P. Schreurs · Journal of Agricultural and Food Chemistry · 1984 · 83 citations

Nutrition, Food Analysis, Altmetric Attention Score +20

A Reliable Semiautomated Method for the Determination of Total Thiamine in Whole Blood by the Thiochrome Method with High-Performance Liquid Chromatography

J. Schrijver, Andries J. Speek, J.A. Klosse et al. · Annals of Clinical Biochemistry International Journal of Laboratory Medicine · 1982 · 56 citations · Full text

Thiamine Phosphate Esters, Whole Blood, Gas Chromatography +17

A PREVALENCE STUDY OF VITAMIN A DEFICIENCY AND XEROPHTHALMIA IN NORTHEASTERN THAILAND

Martin W. Bloem, Michel Wedel, R.J. Egger et al. · American Journal of Epidemiology · 1989 · 30 citations