Exclude category on query_post custom taxonomy

I need to exclude a category from showing up posts.
I registered the taxonomy: portfolio-category
and added a category: accessories (cat ID 19) under portfolio-category

How do I exclude posts from accessories category from showing up?
I tried: 'category' => -19, but it didn’t work
here’s my code:

<?php	$args=array(
						'post_type' 		=> 'items',
						'post_status'		=> 'publish',
						'showposts'			=> intval( get_anolox_option_by('an_homep_count', 3) ),
						'caller_get_posts'	=> 1,

						'paged'				=> $paged,
					);
					query_posts($args);

					$end = array(3,6,9,12,15,18,21,24,27,30,33,36,39,42,45);

					$i = 0;
					while (have_posts()): the_post();
					global $post;
					$i++;
				?>

				<div class="portfolio-item<?php if (in_array($i, $end)) { echo " right"; } else { echo " left"; } ?>">
					<div class="portfolio-item-thumb">
						<a rel="prettyPhoto[mix]" href="<?php echo get_post_meta($post->ID, '_portfolio_data', true); ?>" title="<?php the_title(); ?>">
							<img src="<?php echo alert_no_thumbnail($post->ID, 'portfolioview'); ?>" alt="" />
						</a>
					</div>
					<div class="portfolio-item-desc">
						<h3><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></h3>
						<?php
							if( !alert_no_thumbnail($post->ID, 'portfolioview', true) ){
								print __('Please set the <em>featured images</em> for your portfolio posts, <a href="http://en.support.wordpress.com/featured-images/" target="_blank">learn more</a>', 'an');
							} else {
								if( get_option('an_desc_portfolio_off') != "1" ){
									if(get_post_meta($post->ID, '_port_desc', true) != "" ){
										echo wpautop(get_post_meta($post->ID, '_port_desc', true));
									} else {
										echo wpautop( limit_text( strip_tags(get_the_content()), 90 ) );
									}
								}
							}
						?>
					</div>
				</div>

				<?php endwhile; ?>
				<?php wp_reset_query(); ?>