Table 4 Determination of the stability of folic acid and antimicrobial agents

Folic acid

Peak area

6,380,275

6,349,081

6,350,015

6,352,230

6,349,154

6,341,677

Retention time

14.08

14.28

14.533

14.608

14.657

14.702

Methyl paraben

Peak area

2,012,762

2,012,639

2,010,859

2,013,172

2,014,733

2,013,903

Retention time

8.488

8.463

8.457

8.454

8.446

8.453

Ethyl paraben

Peak area

1,171,284

1,171,128

1,170,525

1,171,281

1,172,147

1,171,810

Retention time

14.308

14.252

14.238

14.231

14.215

14.229

Propyl paraben

Peak area

358,311

358,794

358,099

358,237

359,014

358,153

Retention time

27.639

27.51

27.474

27.458

27.418

27.464