@article{emenhiser_watkins_simunovic_solomons_bulux_barrows_schwartz_1999, title={Packaging preservation of beta-carotene in sweet potato flakes using flexible film and an oxygen absorber}, volume={22}, ISSN={["0146-9428"]}, DOI={10.1111/j.1745-4557.1999.tb00927.x}, abstractNote={ABSTRACT}, number={1}, journal={JOURNAL OF FOOD QUALITY}, author={Emenhiser, C and Watkins, RH and Simunovic, N and Solomons, N and Bulux, J and Barrows, J and Schwartz, SJ}, year={1999}, month={Mar}, pages={63–73} }
 @article{emenhiser_englert_sander_ludwig_schwartz_1996, title={Isolation and structural elucidation of the predominant geometrical isomers of alpha-carotene}, volume={719}, ISSN={["0021-9673"]}, DOI={10.1016/0021-9673(95)00713-X}, abstractNote={The recent development and application of a polymeric C30 stationary phase have given unique separations of cis-trans carotenoid isomers in reversed-phase (RP) liquid chromatography (LC) owing to the exceptional shape selectivity of this stationary phase. In the present research, several geometrical isomers of alpha-carotene were at least partially resolved from a photo-isomerized mixture when chromatographed on a 3-microns polymeric C30 column. Double bond configurations of the five predominant alpha-carotene peaks, as isolated on a semi-preparative C30 column, were unambiguously assigned using 1H nuclear magnetic resonance (NMR) spectroscopy, giving the following order of elution: 13-cis, 13'-cis, all-trans, 9-cis, and 9'-cis geometrical forms. Electronic absorption spectra for these isomers were in agreement with the identification of peaks. The alpha-carotene isomers separated and identified herein had not been previously resolved in RPLC. Confirmation of the structures of geometrical alpha-carotene isomers will aid further studies on the possible physiological roles of these compounds in biological tissues.}, number={2}, journal={JOURNAL OF CHROMATOGRAPHY A}, author={Emenhiser, C and Englert, G and Sander, LC and Ludwig, B and Schwartz, SJ}, year={1996}, month={Jan}, pages={333–343} }
 @article{emenhiser_simunovic_sander_schwartz_1996, title={Separation of geometrical carotenoid isomers in biological extracts using a polymeric C-30 column in reversed-phase liquid chromatography}, volume={44}, ISSN={["0021-8561"]}, DOI={10.1021/jf960104m}, abstractNote={Application of a polymeric C30 reversed-phase (RP) liquid chromatography (LC) column for separations of geometrical carotenoid isomers extracted from biological sources is demonstrated. The relative retention characteristics of all-trans carotenoid standards on the C30 column is also shown under isocratic conditions. Carotenoids were extracted from human serum, raw and thermally processed carrots, a Dunaliella algae-derived preparation of β-carotene, and a poultry feed supplement containing marigold carotenoids. From extracts of plant and algal origin, geometrical isomers of β-carotene (all-trans, 15-cis, 13-cis, and 9-cis), α-carotene (all-trans, 13-cis, 13‘-cis, and 9-cis), and lutein (all-trans, 13-cis, 13‘-cis, 9-cis, and 9‘-cis) were separated and tentatively identified, some of which were previously unresolved on other RPLC columns. Chromatography of serum carotenoid fractions resolved the prominent all-trans carotenoids and separated geometrical isomers of lutein, β-carotene, and lycopene (11 cis-l...}, number={12}, journal={JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY}, author={Emenhiser, C and Simunovic, N and Sander, LC and Schwartz, SJ}, year={1996}, month={Dec}, pages={3887–3893} }
 @article{emenhiser_sander_schwartz_1995, title={CAPABILITY OF A POLYMERIC C-30 STATIONARY-PHASE TO RESOLVE CIS-TRANS CAROTENOID ISOMERS IN REVERSED-PHASE LIQUID-CHROMATOGRAPHY}, volume={707}, ISSN={["0021-9673"]}, DOI={10.1016/0021-9673(95)00336-L}, abstractNote={A novel polymeric C30 stationary phase was tested for its ability to separate geometric isomers of six common carotenoids (lutein, zeaxanthin, β-cryptoxanthin, α-carotene, β-carotene, and lycopene) prepared by photoisomerization of all-trans standards. Resolution and tentative identification of asymmetrical carotenoid isomers yielded the 13-cis, 13′-cis, all-trans, 9-cis, and 9′-cis isomers of both lutein and α-carotene, and the 15-cis, 13-cis/13′-cis, all-trans, 9-cis, and 9′-cis isomers of β-cryptoxanthin. Among symmetrical carotenoids, the 15-cis, 13-cis, all-trans, and 9-cis isomers of both zeaxanthin and β-carotene were resolved and tentatively identified, and nineteen geometric isomers of lycopene were separated. Separations were carried out using Vydac 201TP54 and Suplex pkb-100 stationary phases for comparison; in all cases, the C30 stationary phase gave superior resolution and produced unique separations.}, number={2}, journal={JOURNAL OF CHROMATOGRAPHY A}, author={EMENHISER, C and SANDER, LC and SCHWARTZ, SJ}, year={1995}, month={Jul}, pages={205–216} }