1 Subjects: “...extraction...”

2 Subjects: “...plant extracts...”

3 Subjects: “...plant extracts...”

4 Subjects: “...tryptophan extraction...”

5 Subjects: “...n-hexane extract...”

6 Subjects: “...new-clean process extraction...”

7 Subjects: “...extraction methods...”

8 Subjects: “...solid phase extraction...”

9 Subjects: “...ultrasound assisted extraction...”

10 Subjects: “...solid phase extraction...”

11 Subjects: “...extract...”

12 Subjects: “...extraction method...”

13 Subjects: “...bioactivity investigation of food extract...”

14 Subjects: “...essential oils/extracts...”

15 Subjects: “...tea leaf extract...”