The compositional results of four samples are listed in Table 1. The TS varied from 8.39% to 25.64%, while the VS contents were similar (88.5–97.4%).
To be noted, the potato peeling technologies significantly affect the peel composition.
Hand peeling (WPP) tends to have more starch/cellulose (55.2%) and less hemicellulose (2.9%) in the peel as comparing to the commercial steam peeling (SPP), which has 38.4% starch/cellulose and 14.9% hemicellulose. The samples BP and OP had a total 59.7% and 38.1% carbohydrate, respectively, which were values similar to those previously reported (Anhwange et al., 2009 and Chua and Huang, 2003).
The protein content of BP and OP samples was 8.0–8.6% as compared to 16.1–22.8% in WPP and SPP samples.
These chemical profiles make the peel samples good candidates for organic acid production.