[Ascorbigen and its derivatives--depot preparations of ascorbic acid]

Area of Science:

• Biochemistry
• Organic Chemistry
• Pharmacology

Background:

• Ascorbigen derivatives are novel compounds with potential biological activity.
• Understanding their stability and release kinetics is crucial for potential therapeutic applications.

Purpose of the Study:

• To synthesize new ascorbigen derivatives.
• To investigate the stability and L-ascorbic acid release of these derivatives in aqueous solutions.
• To evaluate the in vivo effect of a specific derivative on L-ascorbic acid levels.

Main Methods:

• Chemical synthesis of ascorbigen derivatives (1'-ethylascorbigen, 1'-benzylascorbigen, 1',2'-dimethyl-5'-methoxyascorbigen).
• Assay of L-ascorbic acid release in aqueous solutions at physiological conditions (temperature and pH).
• Intraperitoneal injection of 1'-methylascorbigen to mice and subsequent blood plasma analysis.

Main Results:

• Successful synthesis of three new ascorbigen derivatives.
• Ascorbigen derivatives demonstrated rapid disintegration in aqueous solutions, yielding L-ascorbic acid.
• The rate of L-ascorbic acid formation was influenced by the indole nucleus substituent, pH, and temperature.
• Intraperitoneal administration of 1'-methylascorbigen resulted in elevated L-ascorbic acid levels in mouse blood plasma.

Conclusions:

• The synthesized ascorbigen derivatives are labile in aqueous solutions, serving as potential precursors for L-ascorbic acid.
• The release of L-ascorbic acid is controllable by chemical structure and environmental factors.
• 1'-methylascorbigen shows potential for increasing L-ascorbic acid levels in vivo.