Abstract: This invention relates to a composition for determining .beta.-hydroxybutyric acid, usable for doctors, nurses, and patients themselves simply and quickly without use of special instruments, and also relates to a method for preparing the said composition.The composition of the invention oxidizes .beta.-hydroxybutyric acid under alkaline conditions and the presence of nicotineamide adenine dinucleotide (NAD) by .beta.-hydroxybutyric acid dehydrogenase, and the produced reduction-type NAD (NADH) reduces tetrazolium salt through an electron carrier to produce formazan developing color. The composition permits accurate measurement quickly and simply, and has excellent conservative stability, because it is a uniform solid-phase composition prepared by applying reagents necessary for the reaction of film impermeable to water together with a natural or synthesized film forming polymer.

Abstract: Reagents for enzyme immunoassay for apolipoprotein B comprising human apolipoprotein B as a standard antigen, peroxidase-labeled Fab' as an antibody, IgG-coated polystyrene balls, a coloring or fluorescent reagent, hydrogen peroxide as a reaction substrate, a reaction stopper, and buffer solutions.Use of these reagents permits accurate and prompt quantification of apolipoprotein B concentration in serum.

Abstract: Novel somatostatin analogs exhibiting high activity in inhibiting insulin glucagon and growth hormone secretion are depicted by the formula: ##STR1## and pharmaceutically acceptable acid addition salts thereof.