QUALITY CONTROL TOOLS APPLIED TO PH VALUES IN AN INDUSTRIAL PRODUCTION OF CASSAVA STARCH

The starch is present inmany species of roots and tubers; the reserve carbohydrate hasa great nutritional and industrial importance and is widely distributed in various plant species. Desirable limits to the pH of the starch are present in the national legislation. This study aimed to conduct monitoring of the same throughout the manufacturing process, with a view to checking the process's ability to comply with the legal limits, and to verify the control limits process. Therefore, we carried out 104 collections of product pH values, which were subjected to statistical analysis in Action Stat® software. By the performance analysisof theprocess, was observed thatit was able and kept within specification described in the governed legislationlimits; the starch may be classified as type I. The resulting collected values indicated no normal distribution, when analyzed individually. The construction of control charts in this situation resulted in false alarms, and the grouping of values using averages collected for analysis 4 was sufficient to normalize the distribution and eliminate such alarms. It can be concluded that the process throughout the study period was under control and was able to stay within the legal limits.