View all text of Subjgrp 82 [§ 113.450 - § 113.499]
§ 113.454 - Clostridium Perfringens Type C Antitoxin.
Clostridium Perfringens Type C Antitoxin is a specific antibody product containing antibodies directed against the toxin of Clostridium perfringens Type C. Each serial shall be tested as provided in this section. Any serial found unsatisfactory by a prescribed test shall not be released.
(a) Each serial shall meet the applicable general requirements provided in § 113.450.
(b) Potency test. Bulk or final container samples of completed product from each serial shall be tested using the toxin-neutralization test for Beta Antitoxin provided in this section. Dried products shall be rehydrated according to label directions.
(1) When used in this test, the following words and terms shall mean:
(i) International antitoxin unit. (I.U.) That quantity of Beta Antitoxin which reacts with L
(ii) L
(iii) L
(iv) Standard antitoxin. The Beta Antitoxin preparation which has been standardized as to antitoxin unitage on the basis of the International Clostridium perfringens Beta Antitoxin Standard and which is either supplied by or acceptable to Animal and Plant Health Inspection Service. The antitoxin unit value shall be stated on the label.
(v) Standard toxin. The Beta toxin preparation which is supplied by or is acceptable to Animal and Plant Health Inspection Service.
(vi) Diluent. The solution used to make proper dilutions prescribed in this test. Such solution shall be made by dissolving 1 gram of peptone and 0.25 gram of sodium chloride in each 100 ml of distilled water; adjusting the pH to 7.2; autoclaving at 250 °F. for 25 minutes; and storing at 4 °C. until used.
(2) The antitoxin content of the test sample shall be determined as follows:
(i) Make a dilution of Standard Antitoxin to contain 10 International Units of antitoxin per ml.
(ii) Make one dilution of Standard Toxin to contain 10 L
(iii) Dilute 1 ml of the test sample with 49 ml of diluent and combine 1 ml of this dilution with 1 ml of the Standard Toxin diluted to contain 10 L
(iv) Combine 10 International Units of Standard Antitoxin with 10 L
(v) Neutralize all toxin-antitoxin mixtures at room temperature for 1 hour and hold in ice water until injections of mice can be made.
(vi) Five Swiss white mice, each weighing 16-20 grams, shall be used for each toxin-antitoxin mixture. A dose of 0.2 ml shall be injected intravenously into each mouse. Conclude the test 24 hours post-injection and record all deaths.
(3) Test Interpretation. (i) If any mice inoculated with the mixture of 10 International Units of Standard Antitoxin and 10 L
(ii) If less than 80 percent of the mice inoculated with the mixture of 10 International Units of Standard Antitoxin and 10 L
(iii) If any mice inoculated with the mixture of Clostridium Perfringens Type C Antitoxin diluted 1:50 and 10 L