| Author | Dela Cruz, Josephine M. |
| Call Number | AIT Thesis no.AE-93-15 |
| Subject(s) | Pineapple juice
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AE-93-15 |
| Abstract | This study investigated different methods to improve stability of cloud in pineapple juice and their effects on other quality parameters of the juice. Methods which include lowering the pH, application of pectolytic enzymes through mash treatment, alteration of processing factors such as variation of centrifug·al force during pulp separation and variation of pasteurization temperature were evaluated. The effect of gum application as clouding ag·ent was also investigated. Lowering the pH between 2.5 to 2.9 using citric and ascorbic acid can hold the cloud without flocculation. However, it increased its acidity and decreased the brix to acid ratio which was beyond the range of a standard JUICe. Among the acids used the ascorbic was found to have the highest average in percent cloud stability but was not significantly different from the citric acid. On the other hand, the effect of pectolytic enzymes used was more on clarifying rather than enhancing cloud stability. Its impact was observed to increase yield extracts from the treated mash. The different centrifugal force and holding· time of pulp - juice separation influenced the amount of pulp and turbidity of the juice. As observed, greater cloud retained on juice centrifuged at lower centrifugal force . Similarly, the juice pasteurized at lower temperature has greater cloud stability than that at higher temperature. Gums added to the concentrate improved the cloud stability of reconstituted juice by 41 % compared to untreated reconstituted juice and 52% compared to the single strength juice. |
| Year | 1993 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AE-93-15 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Athapol Noomhorm; |
| Examination Committee(s) | Sarath Ilangantileke;Jindal, Vined K.;Vincent, Claude-Jean; |
| Scholarship Donor(s) | The United Kingdom; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1993 |