Separation of biologically active chromium complex from cow colostrum

Area of Science:

• Nutritional Biochemistry
• Endocrinology
• Analytical Chemistry

Background:

• Cow colostrum is a rich source of nutrients for infants.
• Chromium is an essential trace element involved in glucose metabolism.
• The glucose tolerance factor (GTF) enhances insulin action.

Purpose of the Study:

• To isolate and characterize chromium-containing compounds from cow colostrum.
• To investigate the potential glucose metabolism-modulating activity of these fractions.

Main Methods:

• Ion-exchange chromatography for fraction separation.
• Sephadex gel chromatography for molecular weight determination.
• Measurement of [U-14C] glucose oxidation in adipocytes to assess GTF activity.

Main Results:

• Five chromium fractions (three anionic: A-1, A-2, A-3; two cationic: C-1, C-2) were isolated.
• Fraction A-1 exhibited significant glucose tolerance factor (GTF) activity, stimulating glucose oxidation in the presence of insulin.
• Molecular weights were estimated: A-1 (1,500), C-1 (2,000), C-2 (1,500). Fraction A-3 behaved like inorganic trivalent chromium.

Conclusions:

• Cow colostrum contains low-molecular-weight, chromium complexes with potential biological activity.
• Fraction A-1, a chromium complex from colostrum, may play a role in glucose metabolism by potentiating insulin action.
• These findings highlight colostrum as a source of bioactive chromium compounds relevant to glucose regulation.