Folic acid compounds in romaine lettuce

Area of Science:

• Nutritional biochemistry
• Food science

Background:

• Folate coenzymes are essential for various metabolic processes.
• Understanding folate composition in vegetables like romaine lettuce is crucial for dietary assessments.

Purpose of the Study:

• To determine the specific folate coenzyme profile in romaine lettuce.
• To quantify the distribution of monoglutamate and polyglutamate forms of folates.

Main Methods:

• Extraction and purification of folate compounds from romaine lettuce.
• Chromatographic separation using QAE-Sephadex A-25, Sephadex G-15, and DEAE-cellulose.
• Identification via cochromatography with radioactive markers and microbiological assays.

Main Results:

• Romaine lettuce contains a complex mixture of folate coenzymes.
• Major folates identified include 5-methyltetrahydrofolate (5-CH3-H4PteGlu) (32%) and its polyglutamate forms (9-31%).
• Minor folates include 5-formyltetrahydrofolate (5-CHO-H4PteGlu) (1%) and its polyglutamate forms (3-13%).

Conclusions:

• Romaine lettuce is a significant source of various folate forms, particularly 5-methyltetrahydrofolate.
• The study provides detailed insights into the folate vitamers present in this leafy green vegetable.