Abstract:Objective To explore the impairment of colorectal cancer post-operative chemotherapy on intestinal barrier function of patients and the effects of alanyl glutamine and bifidobacterium triple viable capsule on intestinal barrier function. Methods Totally 120 patients with colorectal cancer who received post-operative adjuvant chemotherapy were randomly divided into three groups: The control group (n?=?40): only oxaliplatin plus capecitabine (CapeOX) chemotherapy was applied; glutamine group (n?=?40): with the same chemotherapy regimen as that of the control group, alanyl glutamine injection was used one day before the chemotherapy for 5 consecutive days; probiotic group (n?=?40): with the same chemotherapy regimen as that of the control group. bifidobacterium triple viable capsules were taken orally one day before the chemotherapy for 5 consecutive days. The intestinal barrier function indexes such as diamine oxidase, D-lactic acid and bacterial endotoxin were detected before and after chemotherapy in the three groups, and the adverse reactions such as nausea, vomiting, diarrhea, abdominal distention, weakened bowel sounds and anorexia were evaluated during post-operative adjuvant chemotherapy in the three groups. Results The levels of diamine oxidase, D-lactic acid and bacterial endotoxin in glutamine and probiotic groups after chemotherapy were lower than those in control group, difference of which was statistically significant (P?0.05). The levels of diamine oxidase, D-lactic acid and bacterial endotoxin in the control group were higher than those before chemotherapy, which showed a statistically significant difference (P?0.05). The scores of diarrhea and abdominal distension after chemotherapy in glutamine was lower than those in control group, and the difference was statistically significant (P?0.05). Conclusion CapeOX chemotherapy regimen would damage intestinal barrier function. Alanyl glutamine and bifidobacterium triple viable capsule could improve the intestinal barrier function indexes of patients with colorectal cancer treated with post-operative CapeOX regimen chemotherapy. Alanyl glutamine capsule could improve diarrhea and abdominal distension caused by CapeOX regimen chemotherapy.