ISO INTERNATIONAL STANDARD 11214 First edition 1996-07-01 Modified starch - Determination of carboxyl group content of oxidized starch ISO Reference number ISO 11214:1996(E) No reproduction or networking permitted without license from IHS Not for Resale ISO11214:1996(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISo 11214 was prepared by Technical Committee ISO/TC 93, Starch (including derivatives and by-products). Annexes A and B of this International Standard are for information only. ISO 1996 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization forStandardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland tional Organizat Standardizatior ion or networking permitted without license from IHS Not fr esale ISO 11214:1996(E) INTERNATIONALSTANDARDISO Modified starch - Determination of carboxyl group content of oxidized starch 1 Scope by adding a mineral acid to a homogenized test por- tion of the oxidized starch. This International Standard specifies a method for the The cations and the excess acid are eliminated by determination of the carboxyl group content of oxidized starch. washing with water. The washed sample is gelatinized and titrated with The method is suitable for determining carboxyl group sodium hydroxide standard solution. contents up to 1 % (m|m). For oxidized potato starch, the result is corrected for the phosphate group content. 2 Normative references 4 Reagents and materials The following standards contain provisions which, Use only reagents of recognized analytical grade, un- through reference in this text, constitute provisions less otherwise specified, and water complying with of this International Standard. At the time of publi- grade 2 in accordance with ISO 3696. The water used cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements shall be free of carbon dioxide. based on this International Standard are encouraged to investigate the possibility of applying the most re- 4.1 Hydrochloric acid, 0,1 mol/l solution. cent editions of the standards indicated below Members of IEC and ISO maintain registers of cur- 4.2 Sodium hydroxide, standard volumetric sol- rentlyvalidInternationalStandards. ution, c(NaOH) = 0,1 mol/l, free of carbon dioxide. Iso 1666:-1), Starch Determination of moisture 4.3 Phenolphthalein in ethanol, 1 g/l solution, content -- Oven-drying method. 90 % (V/M). IsO 3696:1987, Water for analytical laboratory use Specification and test methods. 4.4 Silver nitrate, 10 g/l solution. ISO 3946:1982, Starches and derived products Determination of total phosphorus 5 Apparatus content Spectrophotometric method. Usual laboratory apparatus and in particular the fol- lowing. 3Principle 5.1 Beakers, of capacity 100 ml and 600 ml. The carboxyl groups are converted into the acid form 5.2 Magnetic stirrer 1) To be published. (Revision of ISO 1666:1973) No reproduction or net