Judul: Mempelajari Keawetan Tempe Pasteurisasi Dalam Kemasan Vakum HDPE dan Alumunium Foil
Abstrak: Tempe is very perishable food at room temperature. Several techniques used to process tempe for its preservation have been developed. These processing techniques include drying, frying, and canning have been used to achieve long shelf life of tempe, with the significant loss of tempe’s freshness. The objective of this research was to evaluate the effect of pasteurization process, as a milder heat treatment, in combination with vacuum packaging on extending shelf life of tempe. Using a target microbe of nonproteolytic C. botulinum with z value of 7.2 oC and D85 of 0.28 minutes, the extent of pasteurization process was based on the heat penetration data and calculated as Pv = P85 (z=7.2). Our result indicated that 6D reduction of C. botulinum was easily achieved at all temperatures of pasteurization. Futhermore, from several combinations of time and temperature studied, the optimum pasteurization value resulted in maximum shelf life of pasteurized tempe. The optimum pasteurization values of tempe vacuum packed in HDPE and stored at 5, 15, and 20 oC were 35.05, 35.36 and 33.30 minutes. The associated maximum shelf life of the tempe were 24, 16, and 13 days. For tempe vacuum packed in aluminium foil and stored at 5, 15, and 20 oC, the optimum pasteurization values were 37.04, 35.44, and. 42.47 minutes. These optimum pasteurization values resulted in shelf life of 25, 17, and 12 days. Therefore, the longest shelf life of 25 days was obtained from P85 (z=7.2) of 37 minutes by using aluminium foil packaging and stored at 5 oC. The anomaly observations, in which the shelf life was not proportional to the pasteurization value, was interesting and thought to be associated with complex microbiological nature of tempe as fermented soyfood.
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Judul: The Impact of Blanching and Vacuum Packaging to The Shelf Life of Fresh Seasoned Tempe
Abstrak: Tempe is an indigenous fermented food from Indonesia, prepared by the action of molds, Rhizopus sp., on cooked soybeans. In 2012, up to 60% of soybean production went to tempe industry with consumption of tempe reaching 8.5 kg per person per year in Indonesia. However, the export of tempe seems still impossible due to its perishable characteristic whose shelf life is very short. Preblanching and vacuum packaging were expected to extend the shelf life of tempe. This research was aimed to study the application of blanching and vacuum packaging on the shelf life of fresh-seasoned tempe. Steam blanching of 80 oC for three minutes was selected from pre-investigation for pre-treatment of the tempe without inducing cooked-tempe characteristic. The result of main research revealed that steam blanching and vacuum packaging were able to extend the shelf life of fresh-seasoned tempe for two days in room temperature (23-24 oC), 32 days in refrigeration temperature (4-6 oC), and 49 days in chilling temperature (0-4 oC). The pH of tempe was found increasing during storage with texture getting overstuffed or tender during storage.
Keyword: Bogor Agricultural University, vacuum packaging, storage temperature, shelf life, Fresh-seasoned tempe

Judul: Which one use to overcome multicollinearity ? Ridge regression or principal component regression
Abstrak: In multiple linear regression the effect of nonorthogonality of the prediction vectors is to pull the least squares estimates of the regression coefficient away from the true coefficient that one is trying to estimate. Separating the effects of each factor of the regressors has been found to be difficult because of high correlation among independent variables. Although the multicollinearity problem has been recognized by many ways, ordinary least squares is still the main technique used in many fields, but the estimation of regression coefficient can present problems when the data vectors for the predictors are not orthogonal, or in this case are multicollinear. In using ordinary least squares, the regression coefficient may be unstable, too large in absolute value, and incorrect with respect to sign. Introduced biased estimation refer to unbiased one that measure the average closeness to the parameter being estimated corresponding to its mean square error (MSE). Ridge regression and principal component can produce better estimates by its own way than those given by ordinary least squares. It may well be preferred estimator since it will have larger probability of being close to true parameter value. Two of the biased regression methods, ridge regression and principal component regression will be applied into this research and discuss briefly for each of its properties. These methods have its particular idiosyncrasy. The biased regression methods attack the collinearity problem by computationally suppressing the effects of the collinearity. Ridge regression does this correctly by modifying the correlation matrix adding a biased constant driving through nonsingular matrix. Principal component regression attacks the problem by regressing Y on the important principal component and then parceling out the effect of the principal component variables to the original variables. Finally translated back the obtained variables into original variables yield the same sign and nearly the same coefficients for both methods.
Keyword: Regresssion analysis