---
kind: "section"
citation: "21 C.F.R. § 173.50"
title: "21"
number: "173.50"
heading: "Polyvinylpolypyrrolidone."
url: "https://uscodex.org/cfr/21/173.50"
---

# §173.50. Polyvinylpolypyrrolidone.


The food additive polyvinylpolypyrrolidone may be safely used in accordance with the following prescribed conditions:

- (a) The additive is a homopolymer of purified vinylpyrrolidone catalytically produced under conditions producing polymerization and cross-linking such that an insoluble polymer is produced.
- (b) The food additive is so processed that when the finished polymer is refluxed for 3 hours with water, 5 percent acetic acid, and 50 percent alcohol, no more than 50 parts per million of extractables is obtained with each solvent.
- (c) It is used or intended for use as a clarifying agent in beverages and vinegar, followed by removal with filtration.

## Notes

### Authority

Authority: 21 U.S.C. 321, 342, 348.

### Source

Source: 42 FR 14526, Mar. 15, 1977, unless otherwise noted.