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The purpose of this paper is to examine the stability and the parameters affecting the stability of vitamin C in beer, wine and orange juice.

In this study, a high performance liquid chromatography method was applied for reliable determination of ascorbic acid in these beverages. Three different types of beer, a wine and orange juice sample were spiked with ascorbic acid using different concentrations and pH values. The samples were stored at 4^oC, but in some cases 20^oC was also used as storage temperature. The joint effect of vitamin C and E was also examined.

The results demonstrated that vitamin C was stable only in orange juice at the original pH values. Under pH=4, beer was also a good matrix for vitamin C addition, but only at low storage temperature (4^oC). Vitamin E addition increased the stability of ascorbic acid (p<0.05) even at room temperature.

These findings could have significant implications to the beer industry. This study shows that vitamin C can be stable in beer during the shelf life of this product using appropriate pH and storage temperature.

The paper shows that the addition of an antioxidant vitamin is good from the point of view of the consumer's health, and it can improve the shelf life of the food because of its antioxidant activity.

This paper aims to complement the current understanding about user engagement in electronic word-of-mouth (eWoM) communications across online services and product communities. It examines the effect of the senders’ prior experience with products and services, and their extent of acquaintance with other community members, on user engagement with the eWoM.

The study used a sample of 576 unique user postings from the corporate fan page of two German firms: a service community of a telecom provider and a product community of a car manufacturer. Multiple regression analysis is used to test the conceptual model.

Senders’ prior experience and acquaintance positively affect user engagement with eWoM, and these effects differ across communities for products and services and across their influence on “likes” and “comments”. The results also suggest that communities for products are orientated toward information sharing, while those discussing services engage in information building.

This research explains mechanisms of user engagement with eWoM and opens directions for future research around motives, content and social media tools within the structures of online communities. The insights on information-handling dimensions of online tools and antecedents to their use contribute to the research on two prioritized topics by the Marketing Science Institute – “Measuring and Communicating the Value of Online Marketing Activities and Investments” and “Leveraging Digital/Social/Mobile Technology”.

This research offers insights for firms to leverage user engagement and facilitate eWoM generation through members who have a higher number of acquaintances or who have more experience with the product or service. Executives should concentrate their community engagement strategies on the identification and utilization of power users. The conceptualization and empirical test about the role of likes and comments will help social media managers to create and better capture value from their social media metrics.

The insights about the underlying factors that influence engagement with eWoM advance our understanding about the usage of online content.

The present study consists of managers and professionals in 26 countries including seven from Central and Eastern Europe. The purpose of this paper is to investigate whether culture dimensions predict country differences in the relationship between gender and organizational commitment. The study integrated theories of social learning, role adjustment and exchange that link commitment to organizational roles to explain such differences in gender effects. Findings indicate that an alternative modernities perspective on theories of gender and commitment is better warranted than is a traditional modernities perspective.

This study examined the relationship between gender and organizational commitment using primary data collected in 26 counties. The cross-level moderating effects of individualism, masculinity, uncertainty avoidance, power distance and restraint vs indulgence was examined using hierarchical linear modeling.

Organizational commitment is found to be higher among men than women in four countries (Australia, China, Hungary, Jamaica) and higher among women than men in two countries (Bulgaria and Romania). Results shows that large power distance, uncertainty avoidance, femininity (social goal emphasis) and restraint (vs indulgence) predict an association between being female and commitment. These all suggest limitations to the traditional modernity-based understanding of gender and the workplace.

This study is unique based on the three theories it integrates and because it tests the proposed hypothesis using a multi-level nested research design. Moreover, the results suggest a tension between an alternative modernities perspective on top-down governmental effects on commitment through exchange and bottom-up personal effects on commitment through social learning with role adjustment in an intermediate position.

The purpose of this study is to understand and compare how business-to-business (B2B) and business-to-consumer (B2C) companies evaluate the return on investment (ROI) on their social media marketing (SMM) programmes and how the investment is handled in these type of marketing programmes.

A mixed-methods approach involving multiple cases and a survey was used. Data were collected from personal interviews with eight professionals responsible for SMM management, from four B2B and four B2C companies, complemented with responses to a web-based survey by the other 28 companies’ marketing managers.

The results show that there are some differences between B2B and B2C companies regarding SMM evaluation and investment but in general marketing managers for both types of firms use simple metrics to evaluate their SMM programmes. The main measures used relate to awareness, engagement and reach and most of the metrics identified are interaction-related.

Given the complex and sensitive nature of the subject, more research is needed focussed on providing additional evidence from a larger sample of B2B and B2C organizations to allow the extension of the finding to the population as the non-probabilistic nature and size of the current sample impose that the findings should be interpreted carefully. Future research should focus on understanding what the firm’s characteristics predict the importance and level of effort placed in SMM and the barriers to ROI measurement in SMM programmes, especially in B2B firms.

The current findings confirm that the topic of SMM ROI evaluation is not a priority for B2C or B2B companies. There is a need for an update of their online marketing strategy, namely, on budget definition and allocation. Furthermore, companies should increase the autonomy of SM managers, as they are dependent from marketing managers and hire specialized professionals devoted to SMM in both B2C and B2B companies.

The findings of this study contribute to improve the understanding of the evaluation of SMM and to extend the literature on the subject. It also provides a relevant advance into the assessment and understanding on the measures used to evaluate the effectiveness of SMM programmes by offering a comparison on how B2B and B2C use metrics and allocate resources to the SMM management.