Properties of soluble dietary fiber-polysaccharide from papaya peel obtained through alkaline or ultrasound-assisted alkaline extraction

Weimin Zhang; Guanglin Zeng; Yonggui Pan; Wenxue Chen; Wuyang Huang; Haiming Chen; Yuansong Li

doi:10.1016/j.carbpol.2017.05.030

Properties of soluble dietary fiber-polysaccharide from papaya peel obtained through alkaline or ultrasound-assisted alkaline extraction

Carbohydr Polym. 2017 Sep 15:172:102-112. doi: 10.1016/j.carbpol.2017.05.030. Epub 2017 May 13.

Authors

Weimin Zhang¹, Guanglin Zeng², Yonggui Pan², Wenxue Chen², Wuyang Huang³, Haiming Chen⁴, Yuansong Li⁵

Affiliations

¹ College of Food Science and Technology, Hainan University, Haikou, Hainan 570228, China; College of Food Science & Technology, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
² College of Food Science and Technology, Hainan University, Haikou, Hainan 570228, China.
³ Institute of Farm Product Processing, Jiangsu Academy of Agricultural Sciences, China.
⁴ College of Food Science and Technology, Hainan University, Haikou, Hainan 570228, China; Agricultural product processing and design institute, Hainan Academy of Agricultural Sciences (HAAS), Haikou, Hainan 571100, China. Electronic address: hmchen168@126.com.
⁵ Institute of Farm Product Processing, Jiangsu Academy of Agricultural Sciences, China. Electronic address: hiyuansong@163.com.

PMID: 28606515
DOI: 10.1016/j.carbpol.2017.05.030

Abstract

Soluble dietary fiber (SDF) from the peel of papaya (Carica papaya Linn.) was recovered through alkaline extraction (alkaline-extracted SDF, a-SDF) and ultrasound-assisted alkaline extraction (ultrasound-treated SDF, u-SDF) processes, and the composition, structure and properties of the extracts were compared. The optimal parameters for obtaining the maximum extraction yield of u-SDF were evaluated through response surface methodology. Under optimal conditions, the maximum yield of u-SDF was 36.99%, and u-SDF had a lower total amino acid content but a higher essential amino acid (16.18%) than a-SDF. A monosaccharide analysis indicated that the primary sugars in a-SDF and u-SDF were neutral sugars and pectic saccharides, respectively. An X-ray diffraction analysis confirmed that u-SDF was less crystalline than a-SDF. Moreover, a thermal analysis indicated that u-SDF exhibited higher thermal stability. In addition, u-SDF exhibited higher water-holding, oil-holding and swelling capacities than a-SDF. These results indicate that papaya peel is a potential inexpensive source of natural dietary fiber and a potential functional food ingredient.

Keywords: Carica papaya; Comparison; Optimization; Soluble dietary fiber; Ultrasound-assisted alkaline extraction.